84 KELLIADiE. 



Telliimja sitborh/'aiJan's, Broavn, Illustr. Conch. Gr. Brit, 106, pi. 42, figs. 14, 15. 



Erycina suborbicukuis, Recluz, Revue Zool. 1844. 



Kellia suhorbicularis, Turt. Ditliy. Brit. 56, pi. 11, figs. 5, 6. — Flem. Brit. An. 430. — 

 Macgilliv. Moll. Aberd. 276; Brit. Mar. Conch. 51. — Alder, Cat. Korthumh. 

 and Diirh. Moll. 9.3. — Wood, Index Tcstaceol. pi. 3, fig. 37. — Hanley, Recent 

 Shells, i. 43, pi. 3, fig. 37. — Forbes and Hanl., Brit. Moll. ii. 87, pi. 18, figs. 9, 9 a, 

 9^), and pi. 0, fig. 4 (animal). — Chenu, Man. de Conch, ii. 125, fig. 598. — Wood- 

 ward, Man. of Moll. 294. — Adams, Genera, ii. 475, pi. 114, figs. 8, 8o, 8i, 8c. — 

 LovEx, Ind. Moll. Scand. 44. — Cahpentek, Catal. of Mazatl. Moll. 105. — Gkav, 

 Coll. Br. Mus. (Br. Moll.) 83. 



Animal witli a front opening in the mantle, where it is produced 

 into a large, thin, simple tube a little below this, for the passage of 

 a slender grooved foot, and behind for a single short siphon seldom 

 protruded. 



Shell very variable in form, from quadrangular with rounded cor- 

 ners, to rounded or ovate-triangular, swelled, thin and fragile, white 

 with a very thin, somewhat iridescent epidermis ; beaks 



Fig. 394. nearly median, small, pointed, inclining inwards rather 



.,;:^^^^a^ than forwards ; no luiiule ; margins nearly parallel, 

 ^^ squared behind, with the angles rounded, anterior dor- 



K suborbicuiaris. ^^^ margin a little declining, so that the anterior por- 

 tion is less elevated and more rounded than the pos- 

 terior, though often squarish at the upper angle. Within white and 

 shining. Plinge with an elongated triangular plate behind the liga- 

 ment, with an erect tooth under the apex in the right valve, and two 

 in the left valve, the more central one the larger, erect or recurved, 

 separated from the other by a triangular space caused by its greater 

 inclination forwards, though united at base. Length, about one 

 third of an inch (though sometimes approaching half an inch) ; 

 height, nearly as great as length ; breadth, one fourth of an inch. 

 . Habitat a little uncertain, but two separate lots were found among 

 Massachusetts and Halifax shells. It is common in the English 

 waters and in Norway, where it is found in crevices of old shells 

 and rocks, and among the roots of sea-weed. 



The specimens were very carefully compared with European speci- 

 mens, and no doubt is left as to their identity. The resemblance in 

 form and size to Sphccrium elegans is quite remarkable, and it may 

 be pretty readily recognized by its squared and symmetrical form. 



Ociius TURTOIVIA, Alder. 1849. 



Shell minute, equi valve, very inequipartite, closed at both ends ; 

 ligament external ; hinge with two adjacent teeth in front, the an- 



