CLASS GASTROPODA 
61 
Type in United States National Museum, No. 108986. Type locality, 
Bering Island. 
Range. Kyska Island, Alaska, to Cook's Inlet. 
Littorina rudis Donovan, 1800 
British Shells, 1; PI. 33, fig. 3. 
Shell somewhat tapering, without umbilicus; volutions of the spire, or 
turbom swelled; lip thick, and glossy within. (Donovan.) 
In the mud appeared a species of Turbo which, though very similar to 
T. littoreus (the common Periwinkle), has some characters that seem to 
authorize its being considered as a different shell. The anfractus are much 
more swollen, as it were, than in the above species; the spire is more de¬ 
pressed ; and, besides, there is no appearance of striae, either transversely 
or longitudinally. This shell has a sort of distorted or rude contour, that 
may, perhaps, entitle it to the appellation of T . rudis. Its color is greenish. 
This shell has been kindly communicated by Dr. Maton, as a new 
species. It is noticed in the first volume of that gentleman's Observations 
on the Western Counties; but has not, we believe, been hitherto figured. 
(Donovan.) 
Type in ? Type locality, Banks of the Tamar in Devonshire. 
Range. Aleutian Islands to Puget Sound, Washington. Also Atlantic. 
Littorina gronlandica Menke, 1830 
Synopsis Mcthodica Molluscorum, 45. 
Litt. testa ovato-ventricosa, tenuiculta, anfractibus convexa, spiraliter 
obsolete liratis; livido-castanea; columella dilatata. 
Shell ovately ventricose, rather thin, whorls convex, spirally obsoletely 
ridged; livid-chestnut; columella broadly dilated. ( Conchologia Iconica.) 
Type in Museum Cuming. Type locality, Greenland. 
Range. The Okhotsk and Bering seacoasts and eastward to Sitka, 
Alaska; Puget Sound. Also Greenland. 
Littorina planaxis Philippi, 1847 
Abbildungen und Bcschreibungen neue oder zvenig gekannte Conchylien, Littorina, 
PI. 4, fig. 16. 
L. testa ovata, acuta, solida, laevigata, griseo-fusca, maculis caeru- 
lescente-albis variegata; anfractibus parum convexis, ultimo ventricoso, 
obscure angulato; apertura ovata, fusca, (fascia solita basali alba) ; colu¬ 
mella arcuata, dilatata, depressa. Alt., 8"'; diameter, 6J4'" ; alt. apert. 5'". 
(Philippi.) 
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