OF CONCHOLOGY. 



99 



subirregulari, radiatim costata et lirata, costis paucis, promi- 

 nentibus ; concentrice obsolete striata ; apice subuncinato ; si- 

 phone conspicuo ; nigricans, intus nigra. 

 Hab. — Insl. Apaian. 



Shell ovate or oblong ovate, somewhat irregular, much de- 

 pressed, radiately ribbed and ridged, ribs few and prominent, 

 particularly the one at the siphon, concentrically obsDletely 

 striated ; apex slightly uncinate ; siphon conspicuous. Color 

 blackish, ribs sometimes lighter, black within. 



Remarks. — A peculiar species, almost flat. The muscular 

 impression occupies nearly the whole of the interior. 



Emarginula clathrata, Pease. — Plate 11, fig. 24. 



Description. — T. oblongo-ovata, alba, costis concentricis et 

 radiantibus clathrata; interstitiis foveolatis ; apice antico ; labro 

 crenato. 



Dimensions. — Long. 8|, diam. 6 mill. 



Hab. — Insl. Howland. 



Shell oblong ovate, white, depressedly convex, clathrated by 

 concentric and radiating ribs, interstices deeply pitted ; apex 

 anterior ; lip crenate and shortly lirate within on its edge. 



Scutellina compressa, Pease. — Plate 11, figs. 25 — 27. 



Description. — T. oblongo-ovata, postice elevata, compressa ; 

 radiatim costata, costis parvis, confertis, subflexuosis, transversirn 

 tenuiter elevato-striata ; apice postico ; flavescente-rubra, ad 

 inarginem pallida. 



Dimensions. — Long. 5, diam. 3 mill. 



Hab. — Tahiti. 



Shell oblong ovate, posteriorly elevated and compressed late- 

 rally, radiately ribbed, ribs small, regular, close, and somewhat 

 wrinkled, transversely minutely elevately striate ; apex posterior, 

 slightly projecting over the margin; yellowish red, margins yel- 

 lowish. 



Remarks. — The animal of the species of the above genus, in- 

 habiting the Sandwich Islands, agrees with the drawing of Mr. 

 Garrett of the above, from Tahiti. They are gregarious in their 

 habits, living under stones at low water mark. They are active, 

 moving at times quite rapidly. The head is well developed, pro- 

 longed in a muzzle, with a terminal mouth and large lobed mask, 

 rounded in front, concave behind, which assists in locomotion. 

 The foot is thick and fleshy, during locomotion (on most of the 



