Abstract
The well known nurse shark, Ginglymostoma cirratum (Gmelin) is a notable exception to the preceding statement, although apparently this fact is neither generally known nor recorded in the literature. Perhaps the attention of ichthyologists has been directed away from other features of sexual differentiation by the very ease with which sex in these fish may be recognized, due to the presence or absence of the claspers. It may be that the same condition will eventually be shown to exist, but to a lesser extent, in numerous other species. Two specimens, male and female, now living in the New York Aquarium, are so close to the same size that even in photographs taken dorsally
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