2 JO Capt. A. C. MacGilchrist on Decapod Crustacea 



in 300 fathoms. This season another female — a more com- 

 plete and larg-er specimen (len<^th of carapace and rostrum 

 ]G"6 mm., of abdomen 27 mm.) — was trawled at Sta. 297 in 

 the Gulf of Oman, 700-G89 fathoms. 



The median carina runniuj; backwards from the rostrum 

 carries a hirge procurved acute spine in the anterior part of 

 the gastric region. There is some variation in the number 

 of spines on the rostrum and gastric region of the carapace. 

 The margin of the rostrum has 4 or 5 spiuelcts in front of a 

 basal spine on eitiier side in its free portion, and on the 

 continuation backwards of the rostral margin on each side 

 the spines vary from 2 to 4 and may display a want of 

 symmetry in number and position on the two sides of tiie 

 same specimen. The spines lying between these and the 

 median carina similarly vary from 2 to 3 in number. 



The chelipeds were wanting in ]\IcArdle's specimen. In 

 this specimen the larger is 26 mm. long, the hand alone 

 measuring 9^ mm. The ischium, merus (except distal part), 

 and palm are much compressed. The lower borders of 

 ischium, merus, and hand, and the upper borders of merus 

 and carpus (distal parts), palm, and finger are spinose. 

 These spines are best developed on the merus ; elsewhere 

 (except at distal end. of lower border of ischium) tliey are 

 mere spinules. There is a small spine on the upper border 

 of ischium near its distal end. The fingers are about as Ions: 

 as the palm and their prehensile edges are finely serrulate, 

 the teeth pointing towards the tips of the fingers ; there is no 

 hiatus left on closure. The smaller cheliped is 17 mm. long; 

 the inferior borders of ischium and merus are spinose ; the 

 fingers are very minutely and regularly serrulate. 



The second pair of ambulatory legs are 25i mm. long ; 

 the third pair are very slightly shorter; the fourth pair 

 resemble the second and third pairs, but are considerably 

 shorter and more slender. 



The telson has a fair-sized terminal spiue with an upcurvcd 

 tip. 



IcoNAXiopsis, Alcock. 

 Iconaxiopsis spiniyera, sp. n. 



In size this species is intermediate between /. laccadivensis 

 and /. andamanensis. The length of the rostrum is also inter- 

 mediate ; it usually reaches to about the middle of the second 

 joint of the antennular peduncle, but shows considerable 

 variation in length, sometimes falling short of the end of 

 the basal joint, sometimes reaching the dis'.al end of the 



