144 THE NAUTILUS. 



BOSTON MALACOLOGICAL CLUB. 



The November meeting was devoted to reports by members on the 

 work done during the summer, collecting or otherwise. At the De- 

 cember meeting Mr. C. J. Maynard gave an account of the distribu- 

 tion and variation of" the species of" Cerion in the vicinity of" Nassau, 

 New Providence, Bahama Islands, showing a large series of speci- 

 mens and illustrating with the aid of a map how the various species 

 and varieties were distributed from what he considered the original 

 starting point. At the January meeting the Secretary gave an ac- 

 count of the various forms of the foot in mollusca, and its adaptation 

 to the habits of the species. Mr. Olof O. Nylander, of Caribou, 

 Maine, spoke at the meeting, February 10, on the distribution and 

 variation of Lymnaa emarginata Say and the var. mighelsi W. G. 

 Binney, in Aroostook Co., Me. A large map, on which was marked 

 the various colonies, clearly showed its limited distribution through- 

 out the Fish River lakes, and a beautiful series used in illustrating 

 his paper published in 1901, with many additional specimens, showed 

 all the gradations between L. emarginata and mighelsi. The speaker 

 referred to the great abundance of the species in some years and their 

 scarcity in others, and the probable causes; also of the changes which 

 are now taking place in the region detrimental to their existence. 



Henry W. WinivLEY, Secretary. 



NOTES. 



A New Form of Okkohei/xx — Oreohdix haydeni betheli, n. 

 subsp. Typically flat and broad, with a lower spire and wider um- 

 bilicus than true (Utah) 0. haydeni; last embryonic whorl concave 

 or even grooved next the suture. The spiral cords are strong 

 throughout, often more numerous than in typical haydeni, 10 to 16 ; 

 fine interstitial spirals visible. Alt. 10, diam. 21 mm. Abundant 

 under rocks on north side of Grand River at Glenwood Springs, Col- 

 orado, collected by E. Bethel, J, Henderson, T. D. A. Cockerell and 

 otliers. The true betheli occurs on the north side of the river, but 

 on the opposite side is a related form (^a/ta Pilsbry, n. v.) with the 

 spire conoidal and the umbilicus narrower, and also other forms to 

 be described later. — H. A. Pilsbry and T. D. A. Cockerell. 



Mr. C. J. Maynard is now in the Bahamas making further studies 

 on the distribution of the vai'ious species of Cerion. 



