i6 



The maxillipeds (figs. 2h—2i) have a large exopod; their endopod is distally somewhat broader 

 than in LopJwgaster. The thoracic legs are essentially as in Lophogastcr, but more slender; last 

 pair in the female with exopod. Sixth abdominal segment (fig. 2 k) is strongly compressed and 

 without any dividing line on the side or any tooth on the lower margin. The uropods (fig. 2 k) 

 have the exopod considerably longer than the endopod and divided into two joints. The telson 

 does not reach the end of the endopod; it is constricted a little before the end (fig. 2/), termi- 

 nating in a small plate deeply serrated along the posterior margin (fig. 2 w). 



Remarks. — This genus seems to be more allied to C/^a/flT^jr/zV Will.-Suhm than to 

 any other genus of the family, but it must be added that Chalaraspis is still very poorly known. 

 From the three other genera it differs especially in the following characters: the frontal plate 

 is small with the process rudimentary or wanting, the squama is shaped as in many common 

 Mysidte, and the telson is shorter than the uropods. It agrees with Lophogaster and Ceratolepis 

 in having no palp on the maxillulce, but it differs from both these genera in two other features: 

 the lobe from the third joint of the maxillae is bifid, and the exopod of the uropods is divided 

 into two well separated joints. Finally it differs from Lophogaster but agrees with Ccraiolcpis 

 in having the sixth abdominal segment completely undivided. 



2. Paralophogaster glabcr n. sp. PL I, figs. 2a — 2 «. 



Stat. 166. August 23. Lat. 2° 28'. 5 S., long. I3i°3'.3 E. 118 m. Bottom hard, coarse sand. 



Trawl. I specimen (half-grown). 

 Stat. 253. December 10. Lat. 5°48'.2 S., long. 132° 13' E. 304 m. Bottom grey clay, hard and 



crumbly. Trawl, i specimen (adult 9)- 

 Stat. 254. December 10. Lat. 5^40' S., long. 132° 26' E. 310 m. Bottom fine, grey mud. Trawl. 



I specimen (9 with eggs). 



Description. — The frontal plate (fig. 2a) is small, its anterior margin nearly semi- 

 circular with a very small triangular rostrum ; from the base of the plate a supra-ocular tooth 

 projects at each side. (In a half-grown specimen the plate (fig. 2 c) is transverse, with the short 

 oblique lateral margins terminating in the supra-ocular teeth, while the front margin is feebly 

 convex without rostral process). The carapace sends a lateral wing forwards along the outer 

 side of the antennal peduncle (fig. 2 b)^ where it terminates in a moderately large, spiniform 

 process outside the base of the terminal joint of the antennal peduncle; the infra-lateral corner 

 is angular, and somewhat above this angle the front margin terminates laterally in a protruding, 

 acute tooth (figs. 2 a and 2 b). The surface of the carapace is glabrous. The eyes (fig. 2 a) are 

 large, reniform, oblique, dark brown. The antennal squama (fig. 2 a) is four times as long as 

 broad, almost equally broad from near the base to the tooth of the outer margin ; the terminal 

 joint is about as long as broad ; the outer margin from the base to the distal tooth is quite 

 glabrous, while the inner margin and the entire margin of the terminal joint are closely set 

 with setae. The abdomen is glabrous, at the base about as high as broad, but gradually more 

 and more compressed towards the telson ; the sixth segment is slightly longer than the two 

 preceding segments (fig. 2k). The proximal joint of the exopod of the uropods reaches the end 

 of the endopod, and its outer distal angle is obliquely cut off and furnished with a few small 



