236 PROCEEDINGS OF THE ACADEMY OF 



Hah. Yiti Isles. (Coll. Phil. Acad. Xnt. Sciences.) 

 This singular species, of which we obtained about fifty exam- 

 ples, was found lurking under stones a little below high-water 

 mark, on the N. E. end of Tavinni Island. 



Plecotrema coxsobkina, Garr., \A. 3, fig. 69. 



Shell small, sub-perforate, ovate, solid, brownish with an ob- 

 scure paler zone; spire convexly conical, about half the length 

 of the shell, apex sub-acute; whorls T, flatl}- convex, the4ast one 

 large, rounded, deflected in front, transversely sulcate, sulci deep, 

 the same width as the intervening ridges, which latter are slightly 

 granulose, and about twenty in the body whorl ; aperture small, 

 oblong, contracted, oblique ; peristome thick, externally varicose, 

 labiate within, and furnished with two stout tubercular teeth on 

 the middle of the lip ; columella slightly expanded, with an oblique 

 transverse compressed fold ; parietal region glazed, bidentate, the 

 lower tooth bifurcate. 



Length 3 mill. 



Hah. Yiti Isles. (Coll. Phil. Acad Nat. Sciences.) 



Not uncommon under stones at high-water mark. In color it 

 closely resembles P. mordax, Dohrn., but is not so robust as that 

 species. It is more closely allied to P. hij'sula, Nobis, but is less 

 than half as large, differs in color, and is never hirsute like the 

 latter. 



Pedipes subglobosus, Garr., pi. 3, fig. 70. 



Shell imperforate, small, moderately thick, sub-globose, 3'el- 

 lowish-horn color, transversely finely ridged; ridges about twice 

 the width of their interstices, slightl}' scabrous with lines of 

 groAvth ; spire short, abbreviatel}' conical ; Avhorls 5, strongly 

 convex, slightl}'' angular, last one sub-globose, becoming angular 

 above as it nears the peristome, base rounded ; aperture oblique 

 oblong; peristome sharp, finely crenulate, white, labiate within, 

 armed with a stout sub-median tubercle, and a sinus above ; colu- 

 mella white, vertical, flattened, with two transverse white com. 

 pressed folds the upper the larger; parietal region tiiinly glazed 

 and furnished with a large transverse compressed white fold. 



Diam., greatest 4i, height 3 mill. 



Hah. Yiti Isles. (Coll. Phil. Acad. Nat. Sciences.) 



Only eight specimens were found. They were obtained from 



