126 The Irish Naturalist, June, 



the caniivoroiis Testacellse, which live underground, may be 

 found, as they have been in other Dublin gardens. 



Sixteen of the species noted are absent from the Co. Dublin 

 column in the last census of the Conchological Society, 1902. 

 The revised nomenclature of the land and fresh-water 

 mollusca being still under consideration by that Society, we 

 adopt that used by its President (Dr. R. F. ScharfF) in his 

 Irish list, vol. i. of this Journal. We have to thank Dr. 

 Scharff, and also Messrs. R. Standen and C. Oldham for 

 verifying some troublesome Hyalhiice and Pisidia. 



Belfast 



THE TEETH IN MESOPEODON HECTORI. 



BY PROFKSSOR RICHARD JOHN ANDERSON, M.D., M.A. 



A SKUi.iv of this cetacean came to our Museum from the Aran 

 Islands some months ago. The length is three feet five 

 inches, and greatest breadth twenty-eight inches. The entire 

 length of the animal was stated to have been twenty-one feet. 



The skull of the specimen described in this Journal on a 

 former occasion was much smaller, viz., 26J inches long by 

 13I wide. 



No trace of any teeth was seen before removing the mucous 

 membrane. On removal, however, of this membrane and the 

 submucous tissue, two conical teeth were found deeply 

 imbedded beneath the tissue investing the lower jaw in 

 front, and were contained in large and wide sockets. Three- 

 eighths of an inch of each tooth appears above the cavity in 

 each case. Each socket is convex externally, and flattish, or at 

 least less convex, internally. 



Each tooth is doubly conical ; the two cones are united 

 base to base, the lower being a truncated cone ; in the narrow 

 end of the latter is the opening of the pulp cavity, which is 

 one-eighth of an inch deep. The tooth is flat from side to 

 side and 5 mm. broad at the thickest part and more convex on 

 the outer side. The teeth lie in a loose packing tissue which 

 fills each socket between the tooth and the bone. It is 



