MORPHOLOGY OF CYPRINODOXT FISHES. 9 



it bears a backwardly directed process for the support of the 

 pulvinular appendage; it tapers anteriorly and ends below the 

 axial bone at about the middle of the length of the anterior 

 ridges. This bone is rounded or oval in cross-section, posteriorly 

 deeper than long : it has a cartilaginous core. 



Text-figure 5. 



Neostetliuslanlcesteri, $. Transverse sections cutting the infrasulcar prominence, 

 A, near its anterior end, and B, at its posterior edge, also just cutting the 

 seminal papilla (X 18). 



^., kidney; ?., liver ; sv., sinus venosus ; oe., oesophagus; i., intestine; m., ureter; 

 v.d., vas deferens; pm., muscle of proctal side; apm., inner muscle of aproctal 

 side; s., seminal papilla; ijp., infrasulcar prominence; is., infrasulcar bone; 

 a., axial bone; ct., ctenactinium. 



The outer pulvinular hone ipv.) is rather similar to the inner 

 in form and structure (PI. III. A, j!?6.) ; posteriorly it bears the 

 pointed antrorse process which appears externally as .the pulvi- 

 nular spine ; it rims forwards outside the inner bone, but in front 

 of the end of the latter becomes median and ventral, and extends 

 forwards in front of the end of the axial bone to the extreme 

 anterior end of the priapium. 



