NATURAL SCIENCES OF PHILADELPHIA. 219 



Drillia pusilla, Garr., pi. 2, fig. 31. 



Shell small, oblong, sub-fusiform, solid, slightly shining, ash}'- 

 uiiite, the lower portion of the whorls grayish-brown ; spire rather 

 long, convex in outline, apex sub-acute; whorls 6-7, convex, 

 slightly constricted beneath the suture, last one contracted at the 

 base and furnished with a stout varix on the right side ; longi- 

 tudinally ribbed, ribs small, slightly oblique, somewhat flexuous, 

 sub-angular, slightly nodulous next the suture, about 15 on 

 the whorls of the spire ; base spirally ridged and grooved ; canal 

 short, rather widel}^ open, truncate ; aperture light-brown, oblong 

 oval, about one-third the length of the shell ; sinus large, x'ounded ; 

 peristome rather sharp, furnished with a small sinus near the 

 base. 



Length t mill. 



Hah. Yiti Isles, Cook's Isles, Paumotus Isles. (Coll. Phil. 

 Acad. Nat. Sciences.) 



Several examples found under stones on the inner reefs. It dif- 

 fers from D. pygvisea, Dkr., found at the former location, in its 

 more slender form, longer spire, and is more distinctly constricted 

 beneath the suture. 



Clathurella pulchella, Garr., pi. 3, fig. 33. 



Shell small, oblong ovate, solid, slightly shining, violaceous, or 

 pinky-red, with a narrow white band; spire moderate, sub-tur- 

 reted, convex in outline, apex sub-acute ; whorls nuclear 3, smooth, 

 normal whorls 5-6, convex, longitudinally ribbed, ribs rather 

 large, rounded, slightly oblique, 11-13 on the body whorl, crossed 

 by numerous spiral elevated lines ; suture deeply impressed ; aper- 

 ture elongate, narrow, slightly flexuous, nearly half the length of 

 the shell ; peristome thick, 5-6 toothed within ; sinus rounded ; 

 columella depressed, smooth. 



Length 5 mill. 



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



A very beautiful species found lurking under stones on the 

 fringing reefs. It belongs to the same group with C. rugosa^ vio- 

 lacea and maculosa. 



Clathurella d^dalea, Garr., pi. 3, fig. 33. 



Shell elongate, solid, slightly gloss}^, j'ellowish-white, maculated 

 with small irregular chestnut-brown spots, mostly confined to the 

 ribs ; spire long, turreted, apex acute ; whorls embrj'onal 3, brown, 



