NOTES ON THE VARIATIONS OF RHEGMATODES. 



377 



similar sort in Gonioncinus. But as said in another connection, 

 I do not attribute any particular significance to this feature in 

 species like these, in which the numbers are large. 



OTOCYSTS. 



The limited attention directed to these organs gave very much 

 the same results as in the case of tentacles. Ordinarily they are 

 said to occur in a more or less regular order between the bases 



FIG. 13. Showing anastomoses. 



FIG. 14. Showing loops and 

 anastomoses. 



ot the tentacles ; and in some species this order is very exact, for 

 the most part. But in Rliegmatodes, as in Gonionemus (op. ?.), 

 this does not seem to be the case. While difficult in preserved 

 material to determine in many cases the presence or absence of 

 these minute bodies with exactness, still a careful search in many 

 of the most favorable specimens failed to detect anything like a 

 definite and symmetrical distribution of them. Agassiz (op. cit.} 

 has described a single one between the bases of contiguous tenta- 

 cles. In many cases two were found, and in a few cases even 

 more. But as intimated above, both the difficulty of their de- 

 termination, and the great liability of loss of tentacles make the 

 matter of a dogmatic statement on this point unwarranted. 



SYRACUSE UNIVERSITY, 

 September 9, 1905. 



