g8 DISCOVERY REPORTS 



Eyeplate very wide, equal in width to the anterior portion of the carapace; well-marked median cleft; 

 anterior and lateral margins evenly rounded without protuberances, but armed with about twenty- 

 three small teeth on each side extending from about half-way along the anterior margins nearly to the 

 posterior end of the lateral margins. These teeth are very regular except that the two or three at each 

 end of both series are smaller than the rest (Fig. 17 A). First and second thoracic appendages as de- 

 scribed for the genus (Fig. 17 C, D). Endopods of the third to the eighth thoracic appendages long and 

 slender, twice as long as their exopods ; articulation between the carpus and the two segmented pro- 

 podus distinctly oblique (Fig. 17E). Genital organ of the male large and conical, tapering distally 

 and armed at the tip with a strong hook-like seta. Uropods long and slender, endopod extending 

 beyond the distal end of the very long apical spines of the telson (Fig. 17 F). Telson equal in length to 

 the last abdominal somite; lateral margins straight and nearly parallel, armed along the distal two- 

 thirds of their length with seven small strong spines, the most distal of which is very close to the outer- 

 most apical spine. Apex broadly rounded and armed with five pairs of long, slender, slightly incurved 

 spines which, unlike other species of the genus, are progressively shorter towards the middle line. 

 A pair of median setae present (Fig. 17 G). 



Length, adult male 15 mm., adult female 14-5-15 mm. 



Breeding. One ovigerous female of 15 mm. was carrying 18 well-developed eggs in the brood 

 pouch. 



Remarks. This species can be distinguished by the long, rather narrow antennal scale with its 

 unusually large terminal tooth and the small apex ; by the broad eyeplates and the comparatively large 

 part of the free margin which show serrations but, most of all, by the shape and armature of the telson. 



Distribution. Schollaert Channel, Palmer Archipelago in a net fishing at a depth of 160-355 m - 



Pseudomma longicaudum sp.n. 

 Occurrence: ( Fi §- l8A ~ G ) 



St. 181. 12. iii. 27 (day). Schollaert Channel, Palmer Archipelago, 160-325 m., 1 imm. <J, 15-4 mm., 1 adult ?, 

 with empty brood sac, 21 mm. Types. 



Description. General form similar to that of P. schollaertis except that the anterior end is rather 

 more swollen. Carapace very short, emarginate posteriorly, leaving the whole of the last two and most 

 of the third posterior thoracic somites exposed in dorsal view; cervical sulcus feebly marked; the 

 portion of the carapace anterior to it somewhat inflated; antero-lateral angles obtusely rounded 

 (Fig. 1 8 A, B). Eyeplate broad with its anterior margin almost straight with distinct median notch, 

 antero-lateral angles evenly rounded; armed with about 23-24 small even spinules extending from 

 about the middle of the anterior margin of each half of the eyeplate to more than half-way along the 

 lateral margin (Fig. 18A). Antennule much less robust than is usual in the genus. The male specimen 

 is immature and the male lobe is very small with no setae. First segment of peduncle considerably 

 broader than the second with the outer distal angle produced bluntly and armed with a group of long 

 plumose setae; anterior distal margin with a blunt projection quite near the median line and armed 

 with a row of five setae with swollen bases ; third segment as long as the first and second together, 

 armed in the female with four very long, densely plumose setae along its inner margin and with a group 

 of two or three similar setae at the inner distal angle. I cannot see these setae in the male but this may 

 be due to its immaturity. In both sexes the blunt projection in the middle of the dorsal surface of the 

 anterior margin of the third segment is very well developed and is armed with four graduated spines 

 and three or four long setae with swollen bases (Fig. 18A-D). Antennal scale long and narrow, more 

 than five times as long as broad ; tooth terminating the outer margin very strong ; apex extending only 



