'280 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Iii this list B. caribbceum, B. belcheri and B. nahagawa 

 are bracketed with B. lanceolatum because I believe that 

 they are not specifically distinct from B. lanceolatum and 

 are at most only varieties, while B. belcheri and B. 

 nakagawce, which are placed in square brackets, seem to be 

 identical. Professor Lankester in a note at the end of 

 Kirkaldy's paper, expressed the opinion that B. lanceola- 

 tum, B. cariboo 1 urn and B. belcheri were not specifically 

 distinct, and I now venture to endorse that opinion, and 

 to bring forward evidence in its favour. In the following- 

 table I have compared the characters of these three 

 forms, with the exception of the ni} T otomes and their 

 arrangement. 



B. lanceolatum. 



B. belcheri. 



B. caribbaum. 



Dorsal fin of moderate 



Same. 



Same. 



height. 







Rostral fin small. 



Well developed. 



Small. 



Caudal fin lancet shaped 



Same. 



Rather poorly 



and well developed. 





developed. 



Ventral fin with 



Same. 



Same. 



chambers and rays. 







Oral sphincter verti- 



Same. 



Over 5th myot. 



cally over 7th myot. 







12 intrabuccal ten- 



Same. 



Same. 



tacles. 







21-11 oral cirri accord- 



Same. 



Same. 



ing to age. 







Olfactory pit present. 



Same. 



Same. 



23-29 prs. of gonads. 



Same. 



Same. 



Aver, lengths 4*8 cm. 



4 cm. 



5 cm. 



