1884.] OF THE 'challenger' EXPEDITION. 2G5 



does not probably indicate the full dimensions attained by the 

 species, for it has the appearance of being rather young. 



5. Helix (Hemiplecta?) CARTERETi. (Plate XXII. figs. 5, 

 5 a.) 



Shell narrowly perforate, rather solid, depressedly conical, fulvous 

 brown above, rather paler beneath. Whorls 7, moderately convex, 

 slowly enlarging, divided by a deepish suture, sculptured with 

 oblique lines of growth and very minute microscopic spiral striae ; 

 last whorl with an obtuse keel at the periphery, somewhat wrinkled 

 beneath, peculiarly contracted a little behind the aperture ; the 

 latter narrowly lunate, flesh-tinted within, subhorizontal. Peristome 

 strong, not reflexed or expanded, slightly dilated over the perfora- 

 tion. Spire shortly conical, with faintly convex outlines. 



Greatest diameter 22 millim., smallest 18^^, height 15. 



Hab. Wild Island. 



This is a very distinct form, remarkable for the ])eculiar piuched 

 character of the last whorl a little behind the aperture. H. novce- 

 hibernice has a faint resemblance to it, but is more regular in 

 growth, brown-banded above the periphery, with a different form of 

 aperture. I have named the species after Capt. Carteret, who dis- 

 covered this group of islands in 17G7. 



6. Helix (Chloritis) DENTRECASTEAUxi. (Plate XXII. figs. 

 6, 6 b.) 



Shell depressed, narrowly umbilicated, light brown, marked with 

 fine lines of growth, and everywhere finely punctate, and probably 

 pilose in a fresh condition. Spire slightly suuken below the body- 

 whorl. Volutions 5, convex above, separated by a deepish suture, 

 slowly enlarging ; the last somewhat inflated, a little descending 

 anteriorly, having two indentations — one, elongate, about the middle 

 of the whorl, at a short distance from the lip, the other nearer the 

 lab rum, just under the base, both forming denticular prominences 

 within. Aperture oblique, narrowly lunate. Peristome whitish, 

 thickened, reflexed everywhere, the extremities being united by a 

 thin callosity spreading over the whorl. 



Greatest diameter 17 millim., smallest 14, height 10. 



Hab. Wild Island. 



This remarkable species is readily distinguished from its allies by 

 the peculiar indentations on the body-whorl forming within the 

 aperture pseudo-denticles. As compared with Pfeiffer's figure of 

 H. eiistoma (Novitat. Conch, ii. pi. 38. f. 3-5), also from the Admi- 

 ralty Islands, it will be seen that this species has a more depressed 

 spire, a narrower umbilicus, and a narrower aperture. 



7. Partula hartmanni. (Plate XXII. fig. 7.) 



Shell elongate, conical, thin, semipellucid, white, narrowly um- 

 bilicated. Whorls 5|, slightly convex, sculptured with minute 

 microscopic spiral striae and fine oblique lines of growth, which give 

 the upper edge of the whorls a slightly puckered appearance ; last 



