140 bulletin: museum of comparative zoology. 



In a specimen in which two small quadrants are adjacent, there 

 are only six otoliths. Taking the two smaller quadrants first, the 

 formula is 



6,2; 1, 8, 6; 6, 6, 7 ; 6, 15; 



The last quadrant is the largest. 



The formula of another specimen, with unequal quadrants, is, 



6, 6, 6; 7, 7; 9; 18, 7; 



This shows only four otoliths, one quadrant without any, and two with 

 only one. 



In a similar specimen with a formula of 



11, 8, 11; 12, 7, 10; 8, 3, 13; 5; 



there are only six otoliths, with three normal quadrants, one not having 

 any sense organs. 



In a specimen with two adjoining radial canals forking below the 

 genitals, making four quadrants with two small sectors cut out of two 

 of them, there are ten otoliths, the formula being 



10, 9, 9 ; 10, 7, 8 ; 2, 6, 2, 8, 7, 12 ; 3, 3 ; 10, 1 ; 



In a second specimen, foi'king similarly at the extremity of one radial 

 canal, the formula was 



7,6,7; 7,7,8; 8; 1,8; 20,8; 



In a specimen with an eccentric digestive cavity and quadrants un- 

 equally developed, the formula is 



14; 7, 6, .5; 7, 8 ; 1, , 10; 



or only five otoliths, neither the first nor the third quadrant having 

 otoliths, while the fourth has two side by side. 



In a specimen with equally developed quadrants, but with a long 

 spur above the genitals at right angles to the radial canal, barely reach- 

 ing the marginal canal, the formula is 



3; 11,6; 5,4,2; 8,8,4; 7,7, 8; 



there being three tentacles between the fork (spur) and the nearest 

 canal. 



In a very irregularly developed specimen, with the formula 



6, 6, 6; 7, 7; 9; 18, 7; 

 there were only three otoliths. 



