ODOSTOMIA. 149 



Although I have only seen very feAV examples of this 

 species, they all agree in shape, texture, sculpture, and 

 other characteristics. It is intermediate between 0. 

 decussata and 0. indistincta, but has perhaps a greater 

 affinity to the latter. From 0. decussata it differs in 

 having a more elongated spire, much fewer, stronger, 

 and more prominent longitudinal ribs, with short trans- 

 verse interstitial striae, which are confined to part of 

 each whorl, instead of the whole surface being finely 

 reticulated : from O. indistincta it may be known by its 

 more conical and less cylindrical outline, and being 

 proportionally broader, having the apex of the spire 

 obliquely pointed instead of abruptly truncated, the 

 whorls more convex, and the suture larger ; the longitu- 

 dinal ribs are thicker, broader, and flattened ; and there 

 are but three rows of spiral striae on the body- whorl, and 

 two on each of the upper whorls. It is also a more 

 solid shell than either of the above-named species. 



22. O. INDISTINCTA"^, Moutagu. 



Turbo indistinctus, Mont. Test. Br. Suppl. p. 129. Chemnitzia -hidi- 

 stincta, F. & H. iii. p. 255, pi. xciv. f. 2, 3. 



Body nearly clear white, with a pale yellowish tinge, over- 

 spread or powdered with minute snow-white flakes or lemon- 

 coloured points : snout long, rather narrow, with a rounded 

 extremity ; it is somewhat grooved on its upper surface as far 

 as the tentacular veil, where the slit for the issue of the pro- 

 boscis is marked by a slight prominence : tentacles very short, 

 united at the bases ; their thin edges are unrolled on the 

 march, which gives them a very large subtriangular, broad, 

 leafy aspect, instead of the usual ear-shaped figure ; tips large 

 and inflated : eyes very black, conspicuous, and close together : 

 foot large, long and extensile, thin, nearly transparent, either 

 truncated or concave in front (depending on the will or action 

 of the animal), with very large auricles, which in progression 



* Obscure (metonymically). 



