302 PYRAMIDELLIDiE. 



Collectors have generally regarded this shell as the 

 Sandvicensis of authors, an obscure species solely founded 

 on a \A'retched figure in Walker's " Testacea " that bears 

 a general though rude likeness to the Odostomia we are 

 proposing to describe. " The fry/' observes Mr. Jeffreys 

 in his interesting monograph of the British members of 

 this little studied genus, " is I believe the Helix resupinata 

 of Montagu (p. 444) from Walker's figure 24." 



It is rather thin, shining, semi-transparent, and snow- 

 white ; the shape ranges from oval-subglobose to globose- 

 conic. The surface may either be termed spirally sulcated, 

 or closely encircled with depressed costellse ; there are often, 

 too, a few scattered but strongly marked wrinkles of in- 

 crease. Exclusive of the sub-mammillary heterostrophe 

 nucleus, there are not quite three volutions, the last of 

 which occupies at least three-fifths of the entire length. 

 They are of rapid growth, are very profoundly divided by 

 an oblique suture, and assume a rounded off subscalar 

 appearance from being abruptly tumid above and com- 

 paratively straighter below. The basal declination of the 

 body, which is neither swollen in the middle, nor angulated 

 at its periphery, is convex. The large and projecting 

 mouth is decidedly longer than the spire ; it is of an oval 

 figure that is slightly and abruptly contracted above by the 

 ventricose base of the preceding turn ; below it is rounded 

 and a little disposed to spread. The throat merely ex- 

 hibits the spiral lines of the external sculpture. The outer 

 lip is simple and acute ; it abruptly projects at the top, is 

 arcuated below, and is merely convex in the middle. The 

 thickish appressed and broadly reflected pillar lip, which is 

 furnished with rather a large but remote fold, has only a 

 slight curvature, and is much elongated, extending over 

 three-fifths at least of the inner lip. There is no decided 



