-NO. 1876. ON THE CRUSTACEAN ORDER CUMACEA—CALMAX. 



615 



basis not increasing in width distally, produced into a lobe which 

 nearh" reaches the end of the nierus. The lower surface of the basis 

 carries a row of teeth toward the distal end. 



The first legs are longer by one-half than the carapace; the basis 

 is armed %vith spines on its lower surface and is about equal in length 

 to the distal segments together. The dactylus is about equal to 

 the carpus and two-tliirds as long as the propodus. The second 

 legs have the ischium distinct; the dactylus is longer than the two 

 preceding segments together. The last pair of legs is distinctly 

 siiorter than the preceding and has the carpus 

 about equal in length to the basis. 



The peduncle of the uropods is about equal in 

 length to the last somite and bears a series of 

 spines of varying length on its inner edge. The tip 

 of the endopod is broken in the type-specimen, 

 but probably it did not greatly exceed four-fifths 

 of the length of the peduncle. The proximal seg- 

 ment is longer bj" one-half than what remains of 

 the distal. The exopod is broken. 



Remarlcs. — Zimmer has lately cast doubt on the 

 distinctness of the genus Bathycuma, pointing out 

 that the three species referred to it have no com- 

 mon character which they do not share wdth some 

 species of Vaunfompsonia except the lack of the 

 eye. While there is much to commend this view, 

 I retain the name provisionally in the present case 

 to indicate that the immediate affinities of the new species seem to be 

 with the three species hitherto referred to Bathycuma. From these 

 species^ it is distinguished by the ridges of the abdominal somites 

 as well as by its much greater size and by various differences of pro- 

 portion noted in the description given above. 



Locality. — Albatross station 4382; off San Diego, California; 

 642-666 fathoms; U.S.N.M. 43095; 1 female (holotype). 



Genus LEPTOCUMA G. O. Sars. 



The characters of this genus have hitherto been very incompletely 

 known, and the occurrence of a new species represented by numerous 

 individuals of both sexes throws some welcome Ught on its affinities, 

 ]\Iost of the new characters described below, the form of the mandibles 

 and maxillulse for example, are quite in accordance with Sars' sug- 

 gestion^ that Leptocuma should be referred to the family Vauntomp- 

 soniidce. I have recently ^ supported Hansen's suggestion that this 



' See Caiman, Fisheries, Ireland, Sei. Invest., 1904, No. 1 (1905), p. 18, and Cumacea of Siboga Exp. 

 (1905), p. 10. 



2 Arch. Math. Naturvid., vol. 4, 1879, p. 12. 



3 Ann. Mag. Nat. Hist., ser. 8, vol. 6, 1910, p. 615. 



Fig. 13.— Bathycuma (?) 

 longicaudata, i m m a- 

 ture female, second 



LEG. 



