PLACOSTYLUS, SOLOMON IS. 97 



not allied to P. seemanni in the Viti group. It varies remarkably in 

 contour, as Mr. Smith has noted, and is sometimes greatly length- 

 ened, a specimen taken by Mr. Guppy measuring 104 mill, long, 29 

 wide, while that shown in h'g. 70 is almost as long. The other ordi- 

 nary variation is illustrated in fig. 6'J, the shell being shouldered and 

 constricted. The type (fig. 08) was a regularly oblong shell. The 

 callus of the outer lip is more or less excavated above, as usual in the 

 genus. Pfeiffer states that young shells have a green epidermis, but 

 this is wholly lost in adults. 



The species is named for M. Hanet-Clery, who collected the first 

 specimens. 



P. SANCHRISTOVALENSIS (Cox). PI. 37, fig. 48. 



Shell perforate, fusiform, thin but moderately strong; yelloiv or 

 olive-yellow, spotted with irregular longitudinal blotcltes, sometimes 

 triangular, and small oval spots of blackish-brown, becoming more 

 diluted, dusky-olive, on the latter half of the last whorl, or some- 

 times the spots are rather large and pale olive or olive-brown 

 throughout ; the spire roseate. Surface glossy, densely corrugated 

 spirally, the wrinkles occasionally confluent, this sculpture fainter on 

 the penult, whorl ; the earlier 3^ whorls densely punctate. Spire 

 slender, elongate, the apex obtuse. Whorls 5^ to 6, but slightly 

 convex, the last oblong. Aperture long-ovate, white within ; peri- 

 stome broadly bordered vvith red-orange, narrowly or rather widely re- 

 flexed, hardly thickened within. Columella expanded and forked 

 at the insertion, produced in a long spiral fold; parietal callus thin 

 and transparent. 



Alt. 66, diam. 26, longest axis of aperture 36^ mill. 



Alt. 63, diam. 25, longest axis of aperture 36^ mill. 



Alt. 71, diam. 29, longest axis of aperture 38| mill. 



San Christoval, Solomon Group. 



Bulimus san-christovalensts Cox, P. Z. S. 1870, p. 172, pi. 16, 

 f. 7. PFR., Monogr. viii, p. 27. Placostyhis sanchristovalensis 

 KOBELT, Conchyl. Cab., p. 34, pi. 8, f. 4, 5. 



A charming snail, somewhat like P. hargravesi in pattern, but 

 more brilliantly colored, more strongly sculptured, and differing in 

 form. Moreover, this species has 3^ nepionic whorls, while P. 

 hargravesi is like the majority of the Solomon Island species in hav- 

 ing but 2^. Viewed from the base, the spiral trend of the columella 

 7 ~ 



