211 



OBSERVATIONS ON THE TERRESTRIAL MOLLUSCA OF 

 OTTAWA AND VICINITY. 



F. R. Latch FORD, B.A. 



{Read February 5th, 1885.) 



Ill a papei- read before this Club on the ath of March, 1880, Mr. G. 

 C. Heron notes the occurrence in the vicinity of Ottawa of thirty-three 

 species of terrestrial mollusks. While his list is remarkable not only 

 as the record of a single year's work, but as the most extensive Cana- 

 dian list previously published, it does not include many species 

 which are now known to occur here. Some of these have leen recorded 

 from time to time in the reports of the conchological branch of the 

 Club, and quite a number of others haA^e been found for the first time 

 during the past year. Owing to the importance of several of these 

 additions, it has been thought advisable that a new list should be pub- 

 lished, and the task of preparing it has been allotted to me. Recog- 

 nizing that its value will depend wholly on its accuracy, I have been 

 careful to include in it no species of whose identity I am not certain, 

 and of whose occurrence here I am not personally aware. With a 

 single exception, I have myself found every species mentioned. Chiefly 

 for the benefit of members of the Club who may take up the stndy of 

 this department of natural history, the localities in which the different 

 shells now occur are pointed out, and such outlines of the form of 

 certain species given as may, it is hoped, obviate the necessity of refer- 

 ence to publications not always readily accessible. In this connection, 

 I would recommend as a most valuable work, Morse's Terresti-ial Pul- 

 monifera of Maine, a copy of which has been presented to the Club by 

 the learned author. 



In nomenclature I have often been at a loss what course to take. 

 Following in the main Dr. Binney, I have in some instances adopted 

 in preference, certain subgeneric names of Prof. Morse, which have not 

 so far been generally accepted, but less on account of their propriety 

 than because the shells to which they have been applied, being com- 

 pai'atively new to science and limited in their distribution, are 

 very little known. As our shells in many cases do not agree in. 



