FAMILY TURBINID^ SKENEA. 117 



lumlricalis ? LiN. (Pl. 36, fig. 349 of this book.) Tubular: usually many interlaced togeth er, 

 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 xxxu. fig. ;03. 



Delfhinula serpuhides. Adams, Bost. Jour, Vol. 3, p. 334. 



S/cenca id. GoULD, Invertebrata of Mass. p. 247, tig. 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, arid will probably be found on the shores of this State. 



(EXTRA-LBIITAL.) 



:S.? laxa. (Delphinula itZ. Say, Jour. Ac. So. 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. CoZor, whitish tinged with yellow. South-Carolina. 

 An- var. monst. Natica vel Valvata ? 



