ANATOMY OF CACOPUS SYSTGMA. 



545 



not^find any features which could be distinguished as common to 

 Cacoptis and to those described by the authority mentioned. 



We will follow Beddard in calling the posterior portion of the 

 sub-maxillaris the suh-hyoideus, and in restricting the original 

 name to the anterior portion of the same muscle. Now this 

 " suh-hyoideus " is much larger than the sub-maxillaris — the 



Text-figvire 13. 



Certain muscles on the ventral surface of the trunk and head of Cacopus systoma 

 have been exposed. T., an inscriptio-tendina of the inner division of the rectus- 

 aliclominis ; C.F., ventral extension of the " cervical fat-body " ; I., the spot 

 ' where the outer division of the rectus-ahdominis and that of the portio- 

 ahdominis are attached to the sliin ; P.S., pectoral septum ; S.M., suh- 

 maxillaris; S.H., sub-hyoideus. For other letters see ke3'-list of abbreviations. 



reverse of what obtains in iiVm« (text fig. 13). The pi'oportion 

 which the former mi^scle assumes in the male is in conformity 

 with the differentiation of a median vocal sac. It is a posterior 

 portion of this mviscle which, along with the skin in this region, 

 becomes enormously expanded to form a large spherical resonator 



