Northern European Waters Research Articles

Notes on the Distribution of Electric Rays (TorpedoSpp.) in Northern European Waters

The distribution of electric rays (Torpedospp.) in northern European waters is discussed.Torpedo nobilianais admitted as of regular occurrence; records of occurrence ofT. marmorataare given in detail. The status in these waters ofT. torpedois doubtful. A synoptic key is provided together with illustrations of the three species.

A new record of the fishBeryx splendensLowe in Northern European waters

A new record of the fish<i>Beryx splendens</i>Lowe in Northern European waters

北欧水域におけるデツカ航法図について(日本航海学会第23回講演会)

First we drew the contours of the constant probability density of the ship-position every each existent Decca Chain in the Northern European Waters, using the following formulae: P (P, R)=sinφ_P+sinφ_R-sin(φ_P+φ_R) P (P, G)=3/4 {sinφ_P+sinφ_G-sin(φ_P+φ_G)} P (R, G)=3/5 {sinφ_R+sinφ_G-sin(φ_R+φ_G)} [See Fig.2〜Fig.9 in this paper] Secondly, by means of the combination of the above mentioned contours, we made the practical "Decca Navigation Chart" by which we could select the appropriate chain and pair to find out the most accurate Decca Fix at any position in the ditto Waters. [See Fig.10 in this paper]

On a New Species of Medusa, Eucheilota hartlaubi n. sp.

In November, 1933, a few medusæ were found in the plankton off Plymouth belonging to the genus Eucheilota. The only species of this genus so far recorded from northern European waters is Eucheilota maculata Hartlaub. The medusæ differed in several respects from this species, one constant difference being that the marginal vesicles never contained more than one concretion. In this respect they resembled E. duodecimalis A. Agassiz, but differed in having a much greater number of tentacles and marginal vesicles.In October, 1934, the medusæ appeared again in considerable numbers and it was now possible to establish the constant features of the species which has apparently never been described before, except possibly for a drawing given by Hartlaub without a description (see below).