117 



with a row of procumbent spines, and a second concentric but shorter row of 

 spines surrounds the base of the rostrum ; otherwise the carapace is smooth. 



The rostrum, which is nearly a third the length of the rest of the carapace, 

 has the dorsal edge serrated throughout and the ventral edge serrated in the 

 distal third only. 



The eyes, which are on short stoutish stalks, are quite without pigment and 

 have some spinules round their base dorsally : they are not differentiated from the 

 eyestalk. 



The antennal scale is falciform ; its outer edge ends in a spine, its inner 

 convex edge is strongly ciliated. 



The external maxillipeds are stout, a little longer than the 1st pair of leo-s, 

 and nearly as long as the combined carapace and rostrum ; their ischium and 

 merus are compressed and somewhat bi^oadened. 



Except for a few spinules on the carpus of the great cheliped the legs are 

 smooth. 



The first three pair of legs are truly chelate and the last two pair are 

 apparently so, since their small dactylus is bifid. 



The first pair is slender. The second pair is also slender, but is much 

 longer than the 1st pair. The third pair is of more than Alphean oddness, the 

 left being slender and non-elongate, while the right is nearly as long as the 

 body without the telson and is very massive, especially as regards the hand, 

 which is not compressed and is twice as long as broad. The last two pair have 

 a three-joint carpus and a two-joint propodite. 



The abdomen is perfectly smooth except for the telson, which is longitudi- 

 nally divided into two lobes by a deep groove, the strong convexity of each 

 groove being spiny. 



The first pair of abdominal legs in the female are uniramous, the last pair 

 (swimmeret) have the outer edge of the outer lobe serrated. 



The largest specimen, which is an egg-laden female, measures 26 millim . 

 from the tip of the rostrum to the tip of the telson. 



The eggs are few and are of very large size— nearly 1-5 millim. in diameter 

 after contraction in spirit. 



Taken from a specimen of Hyalonema masoni dredged in the Andaman Sea 

 at 498 fathoms. Another small specimen was dredged off the Travancore coast 

 in 430 fathoms. 



OOCA 



Regd. No. — (Type of the species) 



