84 AMERICAN MARINE CONCHOLOGY. 
The animal is white, with moderately produced head and foot 
slightly dilated at the anterior angles; eyes black. 
‘ New England. (Hurope.) 
According to Mr. Gwyn Jeffreys, this species = striata, J. 
Adams, 1795. 
7. 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 striz ; aperture or- 
bicularly ovate, peristome not thickened, effuse. 
Shorter than aculeus, with the whorls more compactly coiled 
and stronger strie. The latter are more numerous than in the 
following species. 
Length 2.5, diam. 1 mill. 
New England. 
8. R. MIGHELSI, Stimpson. Fig. 160. 
Proc. Bost. Soc. Nat. Hist. iv. 15. 185%. 
Cingula arenaria, Mighels and Adams (not Montagu). Bost. Journ. iv. 
49, t. 4, f. 24. 1842. 
Shell minute, white, subcylindrical, 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. carrnata, 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. 28. 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 
