202 BIOLOGICAL SUBVEY OF 



Onoba Adams 

 0. AcuLEus (Gould). {Cingula aculeus Gould, 1841, Inv. 

 Mass.; Rissoa aculeus Gould, 1870, Inv. Mass., p. 299, fig. 

 568.) In crevices and under stones in tide pools and a com- 

 mon form. Reported by Verrill from Vineyard Sound in 

 same habitat. Eastport to Stratford, Conn. ; common. Bay of 

 Fundy. 



Skeneidae 

 Skenea Fleming 

 S. PLANOKBis (Fabricius). (Turho planorhis Fabricius, 

 1780, Fauna Groenlandica ; 8. planorhis Gould, 1870, Inv. 

 Mass., p. 296, fig. 563.) A very small form found in tide pools 

 and on rocks at low-water mark. Common from Eastport to 

 New Haven. Nova Scotia, Greenland. 



Litorinidae 

 LiTORiNA Ferussac 



L. LiTTOREA (Linne). {Turbo littoreus Linne, 1758, Syst. 

 Nat. ; Littorina litorea Gould, 1870, Inv. Mass., p. 308, fig. 577) 

 Covers the rocks between high and low water and is the most 

 abundant of the four species. Common along the entire New 

 England coast, where it first appeared in 1871. Nova Scotia, 

 Labrador. 



L. OBTusATA PALLiATA (Say). (Turho palliatus Say, 1922, 

 Jour. Acad. Nat. Sci. Phila.; Littorina palliata Gould, 1870, 

 Inv. Mass., p. 309, fig. 578 ; Littorina ohfusata palliata Daut • 

 zenberg and Fischer, 1915, Jour, de Conch.) Common on the 

 rocks between tides like the preceding, and when protected by 

 seaweed is of beautiful yellow and orange shades. Entire 

 New England coast ; throughout the Canadian Atlantic coast. 



L. RUDis (Donovan). (Turho rudis Donovan, 1804, Brit. 

 Shells; Littorina rudis Gould, 1870, Inv. Mass., p. 304, fig. 

 575.) Common on the rocks like the preceding. Seems to 

 prefer exposed shores. Entire New England coast, Labrador, 

 Greenland, Hudson Bay. 



L. RUDIS TENEBROSA (Moutagu). {Tuvho tenchrosus Mon- 

 tagu, 1803, Test. Brit.; Littorina tenehrosa Gould, 1870, Inv. 



