84 AMERICAN MARINE CONCIIOLOGY. 



The animal is Avhite, with moderately produced head and foot 

 slightl}' dilated at the anterior angles ; ej'es black. 



New England. {Europe.) 



According to Mr. Gwjn JefFre3"S, this species = striata, J. 

 Adams, 1795. 



T. R. MULTiLiNEATA, Stimpson, Fig. 159. 

 Proc. Bost. Soc. Nat. Hist, iv. 14. 1851. 



Shell minute, oblong-ovate, blunt, white; whorls five, convex, 

 marked with about twenty minute, transverse striae ; aperture or- 

 ])icularly ovate, peristome not thickened, effuse. 



Shorter than aculeus, with the whorls more compactlv coiled 



and stronger striae. The latter are more numerous than in the 



following species. 



Length 2.5, diam. 1 mill. 



New England. 



8. R. MiGHELsr, Stimpson. Fig. 160. 



Proc. Bost. Soc. Nat. Hist. iv. 15. 1851. 

 Cingula arenaria, Migliels and Adams (not Montagu). Bost. Journ. iv. 

 49, t. 4, f. 24. 1842. 



Shell minute, white, subcj'lindrical, subplicate longitudinally 



and minutely striate transversely'; spire elongated, conical; whorls 



six, convex ; suture impressed ; aperture moderate, suborbicular. 



Length 2.5, diam. 1.2 mill. 



Maine. 



9. R. EXARATA, Stimpson. Fig. 161. 



Proc. Bost. Soc. Nat. Hist. iv. 15. 1851. 



Shell small, ovate, fuscous, rather solid, imperforate; whorls 



five, rather convex, subplicate posteriorly, and with inequidistant, 



elevated, transverse ribs, three on the upper whorls. Aperture 



small, ovate, peristome thickened. 



Length 2.6, diam. 1.2 mill. 



Massachusetts. 



10. R. CARiNATA, Mighels and Adams. Fig. 162. 



(Cingula.) Bost. Journ. Nat. Hist. iv. 49. 1842. 

 Cingula semicostata. Mighels and Adams (not Montagu). Bost. Journ. 



iv. 49, t. 4, f. 23. 1842. 

 Rissoa pelagica, Stimpson, Bost. Proc. iv. 15. 



Shell very small, ovate conical, ferruginous, very thin ; whorls 

 five, convex, the upper ones with longitudinal ribs, the lower half 



