212 BULLETIN OF THE 



In full-grown specimens of S. agassizii, which attain a length of 150 mm., 

 the antennulary fiagella are only one half as long as the carapace, or even less. 

 The flagellum of the second antenna is very slender and enormously long, — 

 more than two and two thirds times the length of the whole body. The num- 

 ber of teeth on the rostrum and gastric region is nine. 



Length of an adult female, 149 mm.; carapace with rostrum, 54 mm.; ros- 

 trum, 13.5 mm.; second antenna, 410 mm. 



Station 3389. 210 fathoms. 2 males, 8 females. 

 " 3391. 153 " 5 males, 6 females. 



A Solenocera has been recently recorded from the Bay of Bengal by Mr. J. 

 Wood-Mason. 1 In this species the antennulary fiagella are described as being 

 shorter and broader than in any previously described species. As no other 

 characters are mentioned, it is impossible to tell whether it is the same as the 

 "Albatross" species. When the remoteness of the localities is considered, it 

 seems hardly warrantable to assume the identity of the East Indian and Amer- 

 ican species of a comparatively shallow-water genus. 



Peneopsis diomedeae, sp. nov. 



Integument hard, firm, and smooth. Kostrum long, nearly horizontal, ex- 

 cept near the tip, where it is bent up slightly, acute, armed with four teeth 

 above. A dorsal carina, armed with one tooth on the posterior part of the 

 gastric region, runs the length of the carapace. Cervical groove very deep, but 

 not cutting the dorsal carina. Another deep groove runs backward, and then 

 diagonally upward from the cervical groove toward the posterior border of the 

 carapace, stopping just short of the posterior margin. Antennal region well 

 defined by the cervical groove below and a gastro-antennal groove above. A 

 strong antennal tooth on the margin of carapace, below the orbit, another at 

 the infero-lateral angle, a third just behind the groove that marks the posterior 

 limit of the antennal region, and a fourth on the hinder edge of the cervical 

 groove. Above and behind the last mentioned tooth the cervical groove is 

 indented, and the npper angle of this indentation tends to assume the form of 

 a small tooth or spine. 



Fourth, fifth, and sixth abdominal segments carinate on the median dorsal 

 line, and produced to teeth posteriorly. Telson deeply grooved on dorsal side, 

 and armed with a pair of spiniform lateral teeth near the tip. The antennules 

 with their long fiagella surpass the whole body in length ; the prosartema is 

 oval, foliaceous, reaching forward as far as the posterior border of the upper 

 face of the cornea. The exopods of the second maxillipeds are very small, not 

 longer than the short ischial segment of the limb. Upon the appendages back 

 of these, the exopods are reduced to the merest rudiments, discernible only by 

 the use of a lens. In some individuals, indeed, the exopods of the posterior 

 appendages are altogether wanting. 



1 Solenocera hextii Wood- Mason, Ann. Mag. Nat. Hist., 6th ser., VII. 188, 1891. 



