1901.] 



ANATOMY OP OOGIA BEBVICEPS. 



129 



those in the Greenland Eight "Whale as described by Prof. 

 Struthers [12], we shall find an interesting series of stages in 

 their arrangement. 



For this purpose I reproduce the figures given by these authors 

 (see text-figs. 7 and 8). 



In the Grampus (text-fig. 7, p. 128) there are two pairs of 

 distinct muscles ; also a pair of accelerators (A), which only differ 

 from those in Cogia by their smaller size, for in the Small Cachalot 

 they extend mucla beyond the " erectores " and are, relatively, much 

 more conspicuous. JSTo doubt this is in relation to the much 

 greater development of the posterior end of the corpus spongiosum 

 and its bifurcation. 



Text-fig. 8. 



Muscles of Penis of Greenland Eight Whale, seen from below (copied from 



Struthers). 



S. Horseshoe-shaped septum; other letters as in text-fig. 7, p. 128. 



Compare text-figs. 7 & 8 with the figure of these muscles in Cogia (PI. XI. fig. 23). 



Peoc. Zool. Soc— 1901, Vol. II. No. IX. 9 



