12 Cumacea: 1. VaunthompsoDiidae. 2. Gaussicuma, 3. Bathycuma 



and sides, a median carina doubly denticulate along anterior two-thirds of 

 its length, with denticulate lateral branches starting at about two-thirds of 

 the length of the frontal lobe, and two rows of denticles on each of the 

 pseudorostral lobes, which are also denticulate on front and lower margins. 

 First pedigerous segment short, the hinder ones narrowing gradually to the 

 pleon. Each pedigerous segment with a median ventral tooth dii*ected forward 

 and 2 pairs of denticulate carinae, submedian and lateral; the former con- 

 tinued to end of pleon, the latter to its 5*^ segment; the pleon has an 

 additional pair of lateral carinae, and the long telsonic segment has a 

 median carina. Eyelobe with front part sharply downbent is devoid of an 

 eye. Maxilliped 3 with lateral front corner of second joint extraordinarily 

 produced forward. Peduncle of uropods about as long as telsonic segment; 

 endopod over half as long as the peduncle and considerably longer than 

 the exopod, with about 7 spines on medial margin of its P* joint and some 

 apical spines on the second. L. Q with commencing marsupium about 12 mm. 



Antarctic: lat. GS" 15' S., long. SO^ 34' E., depth 3423 m. 



3. Gen. Bathycuma H. J. Hansen 



1895 Bathycuma (Sp. un.: B. elongata), H. J. Hansen in: Brgeb. Planktou-Bxp., 

 u2G.c. p. 55 I 1905 B., Caiman in: Sci. Invest. Fish. Ireland, 1904 app. 1 p. 17 | 

 1905 B., Caiman in: Siboga-Exp., pars 36 p. 9 | 1908 B., Zimmer in: Ergeb. Tiefsee- 

 Exp., V.8 p. 164— 166 [ 1912 jB., Caiman in: P. U. S. Mus., u 41 p. 614 | 1912 J5., T. 

 Stebbing in: Ann. S. Afr. Mus., u 10 p. 135. 



General form elongate. Pseudorostral lobes meeting in the front. 

 First pedigerous segment short but well exposed. Telsonic segment produced 

 between the bases of the uropods. Eye wanting. Mandible with long spine- 

 row. Palp of maxilla 1 with two filaments. Maxilliped 3 with lateral apex 

 of 2^^ joint distally produced, 4*'^ joint little expanded. 



5 species. 



Synopsis of species: 



j Pleon segments multicarinate 1 . B. longicaudatum 



\ Pleon segments not multicarinate — 2. 



f Peduncle of uropod not longer than the exopod .... 2. B. brevirostre 



\ Peduncle of uropod longer than the exopod — 3. 



( Pseudorostrum long 3. B. longirostre 



I Pseudorostrum not long — 4. 



I Uropods with 2^A joint of endopod nearly as long as the 1st 4. B. elongatum 

 Uropods with 2nd joint of endopod not nearly as long as 

 the 1st 5. B. natalense 



1. B. longicaudatum Calm. 1912 B. (?) longicaudata, Caiman in: P. U.S. Mus., 

 u 41 p. 604, 614 tf. 10—13 ] 1912 B. longicaudatus, T. Stebbing in: Ann. S. Afr. Mus., 

 V. 10 p. 135. 



Pseudorostrum short, pointed, slightly upturned, angular sinus defined 

 by blunt antero -lateral tooth. Carapace medio-dorsally arched, front half 

 cariuate with 2 rows of fine serrations more or less alternating, the carina 

 beginning on the narrow eyeless eyelobe. Pedigerous segments 3 and 4 

 each with transverse ridge. The long slender pleon having on the first 

 5 segments dorsal, dorso-lateral and ventro-lateral pairs of ridges. The 

 telsonic segment produced as a prominent rounded lobe between the bases 

 of the uropods. Antenna 1 with 2»<i and 3^ joints subequal, slighter than 

 the !«♦. Maxilliped :] with lateral apex of slender 2"'^ joint produced nearly 



