LAMELLARIA. 61 



L. PELLUCIDA, Verrill. PI. 26, fig. 100. 



Shell ovate, with oblique spire, delicate, transparent, smooth ; 

 aperture broad, ovate, not showing the interior of the spire 

 except from an endwise view. Length, 12-16 mill. 



Martha's Vineyard, Mass.; off Delaware Bay, 86-208 fms. 



Animal yellowish brown, mottled with darker, broad elliptical, 

 swollen, without tubercles on the back. 



Var. GOULDII, Verrill. 



Shell a little shorter, broader, with the spire lower, the apex 

 less elevated, and suture less impressed ; last whorl more ventri- 

 cose, and the outer lip and aperture more broadly rounded. 

 Mantle shorter, broader and higher, with more or less numerous 

 low verrucas on the dorsal surface ; pale yellow or yellowish 

 white, more or less blotched or speckled with brown, flake-white 

 and yellow. Prof. Yen-ill thinks that part of the differences in 

 the soft parts arise from contraction in alcohol ; some specimens 

 are intermediate. 

 L. TENUIS, Jeffreys. PI. 26, figs. 1, 2. 



Thin, fragile, semitransparent, glossy, white, microscopically 

 spirally striate, base with a small but distinct umbilicus. 



Length, 2'5 mill. 



St. 16, Atlantic 0. (Porcupine Expedition). 



This 3'oung shell is scarcely a Lamellaria ; at least, I know of 

 no other species having an umbilicus. 



L. ANTARCTICA, Couthouy. PI. 26, figs. 3,4. 



Shell not observed. Animal with back reticulated on an 

 orange-brown surface, the reticulating lines bordered with white 

 dots, and the intervals covered with larger ones of bright yellow; 

 under side of mantle rose-color, narrowly margined with dark 

 red ; foot lemon-color, paler towards the middle. 



Length, 1'6 inches. 



Orange Harbor, Patagonia. 

 L. PR^TENUIS, Couthouy. PI. 26, fig. 5. 



Back of animal greenish ochraceous, longitudinally wrinkled, 

 with a short cinereous pubescence ; under side of mantle and 

 foot light brownish yellow. Length, 1'25 inches. 



Shell not observed. 



Orange Harbor, Patagonia. 



