Stossich (1895) described a cestode from Varanus arenarius, taken in Egypt, as a new species, Taenia varanii. Sonsino (1895) described worms from the same host species under the designation, Panceria arenaria. But Panceria was preoccupied and Fuhrmann (1899) wrote the generic name, Pancerina. Pancerina was preoccupied by Pancerina Chun, 1879, and the name Panceriella is proposed to replace Pancerina Fuhrmann, not Pancerina Chun. The type and only known species becomes Panceriella varanii (Stossich, 1895) comb. n. The genus Panceriella is similar to Oochoristica Liihe, 1898. Both are based on species from varanid lizards and differ by duplication of the reproductive organs in Panceriella. Both were assigned originally to the subfamily Linstowiinae, family Anoplocephalidae. Joyeux and Baer (1961) transferred the genera to the subfamily Davaineinae, family Davaineidae. The two families have genera with common and overlapping morphological characters, with resultant taxonomic uncertainty. Evidence from bionomics, life cycles, and development suggests that the genera belong in the Linstowiinae. THE GENUS PANCERIELLA Stossich (1895) described a single juvenile cestode from the intestine of Varanus arenarius, taken in Egypt, as a new species, Taenia varanii. Shorty thereafter, Sonsino (1895) described two mature but not gravid specimens from the same host as Panceria arenaria gen. n., sp. n.; named in honor of the naturalist, Professor Paulo Panceri of Pavia. Fuhrmann (1899) apparently assumed that the worms described by Stossich and Sonsino were specifically identical and, since the generic name Panceria was preoccupied by Panceria Andres, 1877 (Quar. J. Micr. Sci., n. s. 17: 221; Porifera), without explanation, he wrote the generic name, Pancerina. But Pancerina was also preoccupied by Pancerina Chun, 1879 (Abh. Senckeng. Ges. 11: 192; Coelenterata). The name Panceriella is here proposed to replace Pancerina Fuhrmann, 1899, not Pancerina Chun, 1879. The suggested generic name retains the intention of Sonsino as a patronymic designation and indicates that the cestode is small. The name of the type and only known species becomes Panceriella varanii (Stossich, 1895) comb. n. Sonsino (1895) described the duplicated genital organs in each proglottid of P. arenaria and noted that this condition was present in the genera (Depylidium, sic) Dipylidium Received for publication 27 June 1969. 1Supported by NSF, GB-8423. Leuckart, 1863 and (Monezia, sic) Moniezia Blanchard, 1891. However, he listed reasons why the varanid species could not be assigned to either of these genera. He stated that the only species known to him to have double genital organs and testes disposed in two distinct areas was Taenia bifaria von Siebold in Creplin, 1846. This species from various ducks and geese, regarded as identical with Taenia laevis Bloch, 1782, was named type of the genus Diploposthe Jacobi, 1896. The systematic position of the genus Panceriella is yet equivocal. Ransom (1909) included Panceria Fuhrmann, 1899, in the subfamily Dipylininae, family Dilepididae. Baer (1927) redescribed and figured P. varanii (Stossich, 1895) Ransom, 1909, and assigned the genus to the subfamily Linstowinae [sic] Fuhrmann, 1907, family Anoplocephalidae. This disposition was adopted by Fuhrmann (1931), Wardle and McLeod (1952), and Yamaguti (1959). However, Spassky (1949) had elevated the subfamily Linstowiinae to family status to contain two subfamilies: Linstowiinae Fuhrmann, 1907, and Inermicapsiferinae Lopez-Neyra, 1943. In the subfamily Linstowiinae, Spassky (1951) included the genera: Linstowia Zschokke, 1899; Oochoristica Liihe, 1898; Pancerina Fuhrmann, 1899; Multicapsiferina Fuhrmann, 1921; Atriotaenia Sandground, 1926; Mathevotaenia Akhumyan, 1946; and four new genera: Cycloskrjabinia, Oschmarenia, Semenoviella, and Sobolevina. In