Cumacea: 11. Diastylidae. 1. Diastylis 93 



pt joint of endopod the longest, but not equal to 2"'i and 3'^ combined, 

 spines on its medial margin 13, 8 on each of the others in the d, 5, 4, 3, 

 in the Q. Colour white, with tinge of yellow. L. about 17 mm. 



5. Georgia, depth (j4 — 310 m. 



6. D. hammoniae Zimmer 1902 D. h., Zimmer in: Ergeb. Hamburg. Magalh.- 

 Saminelr., v. 2 Cumac. p. 6 tf. 8 — 10. 



Pseudorostral lobes slightly upturned, short. Midway between their 

 apex and the small eyeless eyelobe start denticulate ridges diverging at a 

 right angle, then running for a space longitudinally and lastly bending 

 sharply forward; between them are a short feebly denticulate pair of median 

 carinae and outside them a submedian pair of curved folds; near the lower 

 margin runs on each side of the carapace a straight, nearly horizontal, 

 granular line. Pedigerous segments 3 and 4, wider than the 1^* and 2°'\ 

 and each with a rather deep lateral furrow. Pleon segment 5 the longest, 

 6^^ the widest, a little shorter than the telson, the distal section of which 

 has about 12 pairs of lateral setiform spines. Peraeopod 3, 4, without rudi- 

 mentary exopods. Peduncle of uropods about twice as long as the telson, 

 with some 28 spines on the medial margin; rami rather shorter than the 

 telson. exopod slightly shorter than the endopod, of which the P* joint is 

 not greatly the longest, spines on the medial margin of the 3 joints respect- 

 ively 7, 5, 4. Colour clear yellowish white. L. Q 20 mm. 



S. Atlantic, off Cape Blanco, E. Patagonia, 151 m ; lat. 430 6' S., long. 60o W., 105iii. 



7. D. antillensis O. Sars 1871 D. a.. G. 0. Sars in: Ofv. Ak. Forh., u 28 nr. 6 

 p. 803 1 1873 D. a., G. 0. Sars in: Svenska Ak. Handl., n. ser. v. 11 nr. 5 p. 4 1. 1 f. 1— 3. 



Form of Q unusually slender. Pseudorostral lobes not far produced 

 in front of the elongate oval prominent eyelobe; surface of carapace antero- 

 dorsally densely beset with forward pointing spicules, and in the middle 

 obsoletely carinate, with a pair of finely crenulate pleats curving round from 

 the bases of the pseudorostral lobes to the middle of the back. Pedigerous 

 segments 3, 4, rather wider than the rest; pleon segment 5 much the longest, 

 6tii the widest. Telson less than twice as long as the G^ii segment, about 

 ^4*^^ of the peduncle of the uropods. with 5 pairs of lateral spines. Antenna 1 , 

 3'^ joint elongate. Peraeopod 1 very long, 6^'^ and l^'^ joints very long, 

 subequal. Peraeopod 2, 5*^ joint subequal to 6*'^ and 7^11 combined. 3^ and 

 4*^ pairs without rudimentary exopods. Peduncle of uropods subequal to 

 the endopod, which is slightly longer than the exopod, its 1^* joint equal to 

 2'i'i and 3'^ combined, 3'^ much longer than 2"^, spines on the medial margin 

 respectively 6, 2, 4. Integument pellucid. L. 6-5 mm. 



W. Indies, Anguilla, depth 377 — 565 m. 



8. D. koreanus Calm. 1911 D. koreatia. Caiman in: Tr. zool. See. London, 

 V. 18 IV p. 342, 382 t. 37 f. 19—25. 



Pseudorostral lobes far and acutely produced in front of the minute eyeless 

 eyelobe. Surface of carapace setose with spicules interspersed, lower margin 

 minutely dentate anteriorly, the back with a median depression between the 

 branchial regions. Pedigerous segments moderately setose, hind corners of 

 5*'! rounded with a minute terminal spinule. First 5 pleon segments with 

 lateral corners produced and spiniform, and each with pair of small dorso- 

 lateral teeth; telson as long as 5^^ and 6*^1 segments combined, the shorter 

 post-anal section having about 10 pairs of almost setiform lateral spines. 



