FAMILY TURBLNIDJE — SKENEA. 117 



V. lumbricalis? Lin. (Pl. 36, fig. 349 of this book.) Tubular: usually many interlaced together, 

 with numerous raised lines along its length; spire with 8-10 closely connected whorls. Color, 

 ashen gray. Length, 8-10 inches. 



The lumbricalis is reddish brown, and not more than four inches long. Northern Coast. 



GENUS SKENEA. Fleming. 

 Shell minute, discoidal, concavely umbilicated beneath. Whorls three ; mouth expanded. 



Skenea serpuloides. 

 plate xxxii. fig. :03. 



Delpkinula serpuloides* Adams, Bost. Jour. Vol. 3, p. 334. 



Skenea id. Gould, Invertebrata of Mass. p. 247, fig. 189. 



Description. Shell very minute, diaphanous, smooth, not shining, slightly convex above 

 and broadly concave beneath, forming a deep umbilicus which exhibits all the whorls. Whorls 

 three : suture broad and deep. Aperture entire, free, turning downwards, circular, in con- 

 tact with but not embracing any part of the preceding whorl : lip sharp, and receding so as 

 to form an acute gape as it joins the preceding whorl. Opercle horny, multispiral ; the apex 

 central. 



Color. Reddish brown or horn-color. 



Length, 0-03. Width, 0-07. 



One of the smallest of our marine shells, usually attached to stones about low-water mark. 

 Common on the northern coast, and will probably be found on the shores of this State. 



(EXTRALIMITAL.) 



SJ laxa. (Delphinula id. Say, Jour. Ac. Sc. Vol. 5, p. 207; Am. Conchology, pl. 7.) Shell 

 regularly spiral, subovate, nearly smooth. Whorls rounded, perfectly disjoined throughout, rapidly 

 lessening to the apex : a dilated groove on the line of the umbilicus ; aperture oval, with a sharp 

 edge. Color, whitish tinged with yellow. South-Carolina. 

 An var. monst. Naticm vel Valvata ? 



