566 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 49. 



THAIS LAMELLOSA, new variety SITKANA. 



Inner harbor of Sitka, Alaska. 



Shell resembling var. Jiormica, but smaller and thinner, the spire 

 produced, subacute, longer than the aperture; whorls rounded, with 

 no lamination; major spirals conspicuous, two on the penultimate, 

 five or six on the last whorl; aperture small, outer hp not reflected, 

 usually with a deep umbihcal chink. 



Measurements. 



Whorls. 



Height 

 of shell. 



Height 

 of last 

 whorl. 



Breadth. 



5. 



If names were given to mutations such as color markings, etc., the 

 number might be indefinitely increased. All the varieties seem to 

 tun through the same gamut of color, and to have banded mutations. 

 I have not been able to satisfy myself as to the existence of differ- 

 ences in the shell due to sex, but the subject requires further study. 



THAIS (NUCELLA) LIMA Martyn. 



Plate 75, figs. 4-6. 



Buccinum lima Martyn, Univ. Conch., vol. 2, 1784, pi. 46. 



Purpura saxicola Valenciennes, Voy. Venus, Atlas, 1846, p. 4, pi. 8, figs. 4, 4a. 



Purpura attenuata Reeve, Conch. Icon., vol. 3, September, 1846, Purpura, pi. 



10, fig. 49. 

 Purpura Jreycinetii (part), Middendorfp, Sib. Reise, vol. 2, 1851, p. 219, pi. 12, 



figs. 5-9 (not of Deshayes, 1839); also in Beitr. Mai. Ross, 1849, p. 117. 

 Purpura canaliculata et saxicola (part). Carpenter, Rep. Brit. Assoc, for 1863, 



p. 662, 1864. (Smithsonian reprint, 1872, p. 148.) 

 Purpura lapillu^ var. Tryon, Man., vol. 2, 1880, p. 175; not of Linnaeus. 

 Purpura lima (part), Taylor, Trans. Roy. Soc. of Canada, ser. 2, sect. 4, 1895, p. 72. 

 Thais lima Vanatta (syn. excl.) Nautilus, vol. 24, August, 1910, p. 37. — Keep, 



W. Coast Shells, 1911, p. 180, fig. 169. 

 Purpura lima Cooke (syn. excl.) Proc. Mai. Soc. London, vol. 11, pt. 4, 1915, 



p. 203. 



Range. — From Kotzebue Sound, Arctic Ocean, south to Bering 

 Strait and on the west to Bering Island, Kamchatka, the Kuriles and 

 Japan. On the east to the Aleutian Islands, southeastern Alaska to 

 California at Monterey, San Pedro Point, San Diego, and off Lower 

 California on Cerros Island. 



Shell of three and a half to four rounded whorls, not includmg the 

 nucleus; moderately thick with a spi're much shorter than the aper- 

 ture, the last whorl much the largest; with a tolerably miiform spiral 

 sculpture of alternated major and minor spiral cords; aperture large, 

 outer lip not reflected and seldom thickened, more or less crenulated 



