598 



Rostrum narrow-triangular, pointed, reaching until the distal 

 end of the 2nd joint of the antennular pedunele, armed at either 

 side of its base with a strong, sharp tooth, directed foreward; 

 in front of this tooth the lateral raargins of the rostrum carry 

 eaeh four extremely small teeth. A little behind the two large 

 teeth, between which the carapace is carinate in the middle line, 

 the gastric region carries at either side a low squamiform tubercle, 

 that is rounded anteriorly. 



Abdomeu rounded, smooth. Caudal fan much resembling that 

 of Paraxiopsis Brocki de M., telson almost once and a half as 

 long as broad. 



Penultimate joint of antennal pedunele 4-times as long as thick, 

 stylocerite wanting, scaphocerite very small, with no tooth on the 

 inner side of it. 



Merus-joint of external maxillipedes with two strong spines on 

 lower margin, carpus unarmed. 



Right leg of Ist pair of a stout shape. Merus stout with 

 a tooth a little beyond the middle of its lower margin, which, 

 between this tooth and the ischium, is eoarsely serrate. Carpus 

 short, a little wider distally than it is long, its lower margin 

 notched. 



Chelae massive, as long as the carapace, unarmed ; palm once 

 and a half as long as broad and a little longer than the pointed 

 fingers, smooth. 



Merus of the four following legs quite unarmed. 



Length of the single, probably young, specimen 10 m.m., the 

 carapace 3,8 m.m., the abdomen 6,2 m.m. long. 



13. Calastacus euophthalmus n. sp. 



Stat. 139. Lat. 0° U'S., long. 127° 25' E. Depth 397 M. 



Closely allied to Calastacus felix Alcock and Anderson. Spines 

 on the gastric region uot arranged in the form of a horse-shoe, 

 hut in two straight rows, one at either side of the median carina, 

 each with four sharp teeth ; median carina with one sharp tooth 

 just in front of the lateral rows, a little backward another much 



