106 NEW- YORK FAUNA MOLLUSCA. 



This is very common along the coast, and has usually been referred to the T. neritoides 

 of Europe, an adult specimen of which is now before me (See fig. 111). The surface is 

 minutely reticulated ; spire flat ; outer lip broadly bevelled at base, slightly so on the 

 remaining part ; lip thin, turned forward above, and forming an acute angle with the 

 body-whorl; (in the American specimens, however, the lip is bevelled throughout;) the 

 aperture is obliquely oval, instead of being nearly circular as in palliata. The color, in 

 compared specimens, is identical. A few other slight differences will suggest themselves by 

 a comparison of the figures. 



LlTTORINA IRRORATA. 



PLATE VI. FIG. 112. a. b. 



Turbo irroralus. Say, Journ. Acad. Nat. Sciences, Vol. 2, p. 239. 



Description. Shell solid, robust, pyramidal, with numerous elevated obtuse equal lines . 

 suture not indented ; spire acute ; pillar-lip thickened ; lip stout, bevelled to a moderately 

 thin edge, which is everted below ; directly straight above ; aperture oval, angulated above. 



Color. Pale ash or cinereous, or deep brown ; pillar-lip umber-brown ; lip on its margin 

 with purple abbreviated lines. 



Length, O'8-l'O; of aperture, 0'4-0'5. 



Common in salt meadows. I have seen them at Harlem, in great numbers, clinging to the 

 stems of salt grass. Some exceed the dimensions just given. 



LlTTORINA PALLIATA. 



PLATE VI. FIG. 105. a. b. c 



(STATE COLLECTION.) 



Turbo pallialus. Say, Journ. Acad. Nat. Sciences, Vol. 2, p. 210. 



Description. Shell moderately stout, suboval. Whorls four to five, convex, with transverse 

 sinuous wrinkles : spire short, convex, obtuse, but little elevated, much shorter than the 

 aperture ; suture moderately indented ; aperture circular, slightly angulated above, patulous ; 

 lip acute, with large incremental lines. 



Color. Frequently endued with a greenish or reddish brown or blackish pigment, concealing 

 the reticulated surface ; within dark purplish or dusky brown ; margin of the aperture 

 whitish. 



Length, - 45; of aperture, - 3. 



Common on our seashores, and quite distinct, as I conceive, from L. littorina : the lip is 

 not so broadly bevelled, and is more patulous, and the surface is reticulated at all ages. 



