II A MINI \. 35$ 



, while such of the oririihil I'm; '>\YM are 



more boldly spotted. The food of the European species is exclus- 

 ively vegetable, consisting of alg;e and zostera. 



European species. 



There are three European species of Haminea : II. NAVICI 

 distinguished by its large size, very concave columella and spiral 

 striution. H. IIYDATIS, smaller (rarely over 12 mill, alt.) with 

 straighter colnmella and more effaced spiral striation. H. ORI;I.- 

 NYANA, about the size of hydatit, but having the upper curve of 

 the lip prolonged high above the vertex. 



H. NAVICULA Da Costa. PI. 41, figs. 17, 18. 



Shell thin, oblong-cylindric, truncated above, rounded below ; sur- 

 face corneous or lemon-yellow, marked by irregular growth ivrinkles r 

 and showing all over under a lens, excessively fine spiral wary en- 

 graved grooves, far narrower than their interspaces. Vertex imper- 

 forate, concave and white in the middle. Outer lip slightly arcu- 

 ate, rounded above and below, a little thickened, but not twisted 

 toward the upper insertion. Columella very concave, thin, reflexed ; 

 parietal callus thin. Alt. 23, diam. 16 mill. 



Atlantic coast of Europe from England to Spain; Mediterranean 

 Sea. 



Bulla ampulla PENNANT (not L.) Brit. Zool. no. 84, 1776. H. 

 navicula DA COSTA Brit. Conch., p. 28, pi. l,f. 10, 1778 BUQUOY, 

 DAUTZ. & DOLLF., Moll. Rouss. i, p. 517, pi. 63, f. 4-7. 7>. hwliti* 

 BRUG., Enc. Meth., p. 374, in part* FORBES & HANLEY, Hist. 

 Brit. Moll., iii, p. 530, pi. 104d, f. 7 (shell) ; pi. uu, f. 3 (animal). 

 JEFFREYS, Brit. Conch., iv, p. 437; v, pi. 95, fig. 3. Sown.. 

 Conch. Icon., f. 4, and of authors generally. Not B. hydatis Lium-. 

 Bulla comeaLAM., An. s. Vert, vi, p. 36, 1822. Haminea en 

 LEACH, Syn. Moll. G. B., p. 41, 1852. Haminea aubpelluwln H. 

 AD., P. Z. S. 1869, p. 275, pi. 19, f. 13. 



This species is generally known as H. hydatis, but it is quite dis- 

 tinct from that species in the larger size, much stronger spiral stria- 

 tion, more marked growth wrinkles, more concave columella, etc. 

 The bibliography of the form is extensive, as usual with Euro, 

 species, but is mostly under the names hydatis L. and cornea Link. 



Var. globosa JefFr. (pi. 41, fig. 17). More globular. Var. globoso 

 major Monts. Large and globose. Venice. Var. es t Monts. 



