In 1902 Miss Rathbun founded a new species, VV. dentata which, according to her description
given in 1904, differs from J. day in two characteristics, to which a third difference may be added
according to her figures, namely, the form of the antennal squama. She says regarding WV. dentata
that it is “very closely allied” to \. dar, “it differs chiefly in the carina of the sixth abdominal seg-
ment terminating posteriorly in a small sharp tooth or spine”. Though it is not expressly stated in


her diagnosis of XV. dar, this “tooth or spine” should be absent in this species. An investigation of


CRUSTACEA MALACOSTRACA. 51


my material of \. dar, amongst which are Kroyer’s type-specimens, has shown me that the carina
mentioned ends in a right-angled or pointed tooth sharp to the touch. I find that my 4. dar in the
form of the posterior edge of the carina, in the slender form of the rt thoracic hand, but not in the
form of the squama, agrees better with . dentata Rathb. than with JN. /ay sens. Rathbun. And I be-
lieve that 4. dar Kr. is identical not only with WM. dentata Rathb. but likewise with NV. dar sens.
