Boone, Crustacea, Cruise of "Alva," 1931 175 



Tattersall) ; south coast of Arabia (Balss) ; Maldives, Chagos 

 Archipelago, Saya de Mahla (Borradaile) ; Andaman Islands, 

 several localities (Kemp) ; Cheval Paar, Ceylon (Southwell, 

 Kemp) ; Tahiti (Boone). 



Material examined: Two specimens, Venus Point Reef, 

 Tahiti, Society Islands, August 15, 1931. 



Technical description: This species is represented in the 

 collection by specimens taken in close proximity to Coralliocaris 

 superba Dana, from which it is readily distinguished by the 

 following : 



The carapace is slenderer, and has the hepatic spine present, 

 usually very strong. 



The external maxilliped is much slenderer, having the exog- 

 nath very slender and extending as far as the distal border of the 

 penultimate segment of the endognath ; the latter has the first 

 joint slender with a small proximal rounded expansion ; the length 

 of this article is about four times the average width ; the second 

 joint is about one-half as long as the first, slenderer, about two 

 and a half times as long as wide ; the distal article is tapered, about 

 one-sixth longer than the preceding article; all three joints are 

 setigerous on the inner lateral margin. 



The first pair of legs is very slender, with the carpus from one 

 and three-fourths to two and one-half times as long as the related 

 chela ; the palm is twice as long as the fingers. The second pair 

 of legs is unequal and of different structure. The merus of 

 each is slender, devoid of an upper distal tooth, but with a 

 strong distal tooth present at the inf erodistal margin ; the car- 

 pus has the upper distal margin entire and bears no ventral 

 tooth. In the large chela, which may be either the right or left 

 one, the palm is slender, convex, narrowed distally, from three 

 and one-half to four times as long as the fingers; the dactyl is 

 dorsally carinate and abruptly angulated midway this margin, 

 the angulation ending in a rounded node ; the finger tip is curved, 

 acuminate; the cutting edge carries two or three small teeth 

 near the center, which interfit with two opposed teeth of the lower 

 finger. This chela opens almost vertically. The smaller chela has 

 the palm moderately slender, with the fingers about two-thirds as 

 long as the palm with the cutting edges laminate, with a distinct 

 concavity of the two fingers, and tips both curved, so that from 



