NO. 9 



MUSCULATURE OF THE BLUE CRAB COCHRAN 



65 



clawlike teeth, which are called the " lateral accessory teeth." (Figs. 

 26, 27, 28.) 



IX. Prepecfi Ileal ossicles. One pair. — These slender, curved, rod- 

 like ossicles, lying entirely on the lateral stomach wall, extend upward 

 and forward from the pectineal ossicle to the outer anterior end of 

 the zygocardiac ossicle with which they articulate by a cartilagelike 

 tissue. (Figs. 25 C, 26, 27, 28.) 



— ^V 



Fig. 28. — Internal view of posterior part of stomach, the anterior parts being 

 dissected away to show the "gastric mill." 



/, mesocardiac ossicle; //, pterocardiac ossicle; ///, zygocardiac ossicle; V, 

 urocardiac ossicle; J 'III, pectineal ossicle; IX. prepectineal ossicle. 



CdAl, anterolateral cardiac plate; CdPl, posterolateral cardiac plate; CpV, 

 cardiopyloric valve. 



X. Postpectineal ossicles. One pair. — Passing downward and for- 

 ward from the posterior margin of the pectineal ossicle, these ossicles, 

 also slender and rodlike, merge with the ventral wall of the stomach 

 below the posterolateral cardiac plates. For the greater part of their 

 length they lie closely in contact with the inferolateral cardiac ossicles, 

 which can scarcely be distinguished from them at their anteroventral 

 termination. (Figs. 26, 27.) 



XI. Inferolateral cardiac ossicles. One pair. — These ossicles are in 

 contact with the subdentary ossicles near their posterior termination. 



