NATURAL SCIENCES OF PHILADELPHIA. 221 



Length 7 mill. 



Hah. Yiti Isles. (Coll. Garrett.) 



A rare species remarkable for the deep sulcate base. 



Clathurella obesa, Garr., pi. 2, fig. 36. 



Shell oblong, fusiform, spire moderately elevated, turreted, apex 

 acute, base contracted, pale luteous; whorls T, convex, the last 

 one ventricose, tabulate above, longitudinally ribbed; ribs small, 

 prominent, rounded, 16 on the body whorl, crossed by numerous 

 small transverse ridges, of which there are five on the penultimate 

 whorl ; aperture elongate oblong, slightly flexuous, half the length 

 of the shell; the posterior sinus large, sub-ovate; peristome 

 faintly crenulate, labiate and eight-toothed within; columella 

 rugose with oblique ridges. 



Length 9 mill. 



Hah. Viti Isles. (Coll. Garrett.) 



A very rare species closely allied to C. lutea^ Pse., from which it 

 may be distinguished by its stouter ribs, more robust form, more 

 distinctly tabulated whorls, and longer aperture. 



Clathurella semilineata, Garr., pi. 2, fig. 37. 



Shell small, oblong, sub-fusiform, slightly shining, cinereous, 

 with four or five transverse brown lines on the upper whorls and 

 three near the base ; spire rather long, acute, base much contracted ; 

 nuclear whorls 3, wrinkled, brown, normal whorls 5-6, flatly con- 

 vex, longitudinally ribbed ; ribs rather stout, rounded, transversely 

 nodose, 12 on the body whorl, interstices with small transverse 

 ridges which form the nodules on the ribs ; aperture elongate ob- 

 long, narrow sides nearly parallel, aljout a third the length of the 

 shell ; posterior sinus large, rounded ; peristome with 6-7 teeth 

 on the inner edge. ' 



Length 5 mill. 



Hah. Samoa and Viti Isles. (Coll. Garrett.) 



We found ten examples of this pretty species under clumps of 

 coral on the outer reefs. Its most obvious character is the two 

 groups of lineations, which are constant. It belongs to the group 

 represented by C.felina, Hds. and C. violacea, Pse. 



Clathurella pinguis, Garr., pi. 2, fig. 38. 



Shell small, ovate, fusiform, solid, base contracted, spire short, 

 rose-red with a single revolving white band ; nuclear whorls 2, 



