1887.] COLLECTION FROM CHRISTMAS ISLAND. 517 



end ; subdigital lamellae smooth, thirty-two under the fourth toe. 

 Brown above, strongly iridescent, with small golden and blackish 

 spots, most numerous on the sides and limbs ; lower surfaces white. 



millim. 



Head 15 



Width of head 9*5 



Body 56 



Fore limb . . 22 



Hind limb 31 



A single female specimen, without tail. 



3. Typhlops exoc(eti, sp. n. 



Body much elongate, of subequal diameter throughout. Snout 

 depressed, rounded. Nasal semidivided, the suture in contact with 

 the second labial ; a praeocnlar, of about the same size as the ocular, 

 which rests on the third and fourth labials ; eye very distinct, under 

 the ocular ; the so-called rostral rounded and narrowing posteriorly, 

 the length of its upper part about equal to its width. Twenty scales 

 round the middle of the body. Tail twice as long as broad at the base, 

 ending in a spine. Pale brownish, each scale with a brown spot ; 

 these spots largest and darkest on the dorsal surface, where they form 

 longitudinal lines. 



Two specimens, of which the dimensions are as follows : — 



a. Total length 350 millim., diameter of body 6, length of tail 8. 



b. Total length 230 millim., diameter of body 3-5, length of 

 tail 6. 



IV. MOLLUSCA. 

 By E. A. Smith. 



Of the sixteen species of shells obtained at Christmas Island, four- 

 teen belong to well-known forms, but two, a Succinea and a Littorina, 

 appear to be new. No locality has been previously assigned to 

 Nerita 7naxima, and Littorina picta has hitherto been known from 

 the Sandwich Islands only. All or most of the marine forms occur 

 both in the Malay Archipelago and Polynesia. The Melampi have 

 an equally wide distribution ; and the species of Succinea, although 

 considered distinct, like most others of the genus, bears a great 

 resemblance to those from other parts of the world. 



The following is a list of the species : — 



*1. Terebra crenulata, Linn. 



2. Columbella (Pusiostoma) tnendicaria, Lamarck. 



3. Sistrum ricinus, Linn. (var. albolabris). 



4. Mitra viryata. Reeve. 



5. Runella cruentata, Sowerby. 

 *6. Triton chlorostoma, Lamarck. 



* These species are all inhabited by Paguri. 



