144 TUE NAUTILUS. 



BOSTON MALACOLOGICAL CLTJB. 



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 

 io 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. miglielsi TV. G. 

 Binney, in Arooslook 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 migkelsi. The speaker 

 referred to the great abundance of tiie 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. WINKLEY, Secretary. 



NOTES. 



A NEW FORM OF OKT-.OHEMX 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 

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

 on the opposite side is A related form (alta Pilsbry, n. v.) with the 

 ?pire conoidal and the umbilicus narrower, and also other forms to 

 be described later. H. A. PILSBUY and T. D. A. COCKERELL. 



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

 on the distribution of the various species of Cerion. 



