220 FIELD MUSEUM OF NATURAL HISTORY ZOOLOGY, VOL. VII. 



Chloritis (Sulcobasis) camaratus n. sp. Plate IV, figures 2-4. 



Type No. 11255, F. M. N. H.; Bougainville, Solomon Islands. 



Shell usually uniform chestnut brown, sometimes paler near the 

 apex; nepionic shell worn in all the specimens, but apparently only 

 slightly wrinkled in harmony with the lines of growth; whorls five 

 and a half, separated by a strongly marked suture, between the coils 

 of which the whorl is markedly convex ; periostracum thin and fuga- 

 cious, originally rather profusely furnished with long rather stout 

 hairs or threadlike prominences beneath each one of which there is 

 a marked rather large shallow punctation on the surface of the shell ; 

 usually only traces of the periostracum and hairs remain in sheltered 

 places; other sculpture consists of fine regular concentric striation 

 in harmony with the lines of growth, covering the whole shell, and a 

 few irregular basal sulci usually only visible near the umbilicus be- 

 hind the reflected lip; spire rather elevated, base rounded, some- 

 what flattened on the part opposite the aperture; umbilicus small, 

 gyrate, overshadowed in part by the reflected columellar lip ; aperture 

 slightly descending, rounded, simple, with a moderately reflected lip, 

 thickest and most extended at the pillar; body with a slight wash of 

 callus which, with the reflected lip, hardly differs in color from the 

 rest of the shell ; interior of the aperture whitish. 



Dimensions of nine specimens in millimeters : 



Height' Max. Diameter 



25.0 31.0 



26.5 35.0 



3i-o 3i-5 



28.5 32.5 



33- 3 6 - 



34-0 37.0 



32-5 38-0 



3 2 -S 37-o 



33- 39-5 



Average, 30.6 35.2 



Collected in the interior of Bougainville Island, Solomon Islands, 

 by Mr. G. A. Dorsey. 



This is quite unlike either of the two other species known from 

 this island. C, bougainvillei is much larger, proportionately de- 

 pressed, and conspicuously malleated. C. quercinus is smaller, much 

 more depressed, and of quite different form. 



The salient characters are the fine incremental sulci, which are 



