66 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 92 



but as they go forward and downward along the ventral wall of the 

 stomach, they soon join the postpectineal ossicles, as noted in the 

 preceding paragraph. Seen from below, these ossicles are found to be 

 wide posteriorly, tapering as they converge anteriorly. (Figs. 25 C, 

 26, 27.) 



XII. Suhdentary ossicles. One pair. — Each of these ossicles, some- 

 what curved and boomerang-shaped externally, is in contact on its 

 upper margin with the zygocardiac ossicle. Ventrally each is attached 

 by a cartilagelike tissue to the inferolateral cardiac ossicle just at its 

 posterior point of attachment to the postpectineal ossicle. (Fig. 26.) 



XIII. Lateral car dio pyloric ossicles. One pair. — These extremely 

 small curved ossicles lie behind the inferolateral cardiac ossicles and 

 are attached on their lower posterior border to the anterior supra- 

 ampullary ossicles. (Fig. 26.) 



Cd Al. Anterolateral cardiac plates. One pair. — These rhombic 

 membranous plates lie directly in front of the posterolateral cardiac 

 plates but are much less clearly defined. There is no heavy calcification 

 in these plates, but the anterodorsal margin is stiffened into a ridge 

 that is slightly thicker than the remaining memln-ane of the plate. (Figs. 

 25 C, 26, 27, 28.) 



Cd PI. Posterolateral cardiac plates. One pair. — These broad plates, 

 nearly triangular in shape, lie above and in front of the postpectineal 

 ossicle. Although most of the surface is membranous, each plate has 

 a hammer-shaped calcification extending along its upper and anterior 

 borders, to give attachment to the lateral cardiac muscles. The inner 

 posterior border of each plate has several rows of bristles, which 

 project into the stomach. (Figs. 25 C, 26, 27, 28.) 



Cp V. Cardiopyloric valve. — This valve lies in the ventral posterior 

 part of the stomach, bounded at each side by a posterolateral cardiac 

 plate. It is approximately tongue-shaped, and the thickened posterior 

 end is provided with bristles. It regulates the entrance of triturated 

 material into the intestine. (Figs. 25 C, 27, 28.) 



PYLORIC " SUPPORTING OSSICLES " 



The three follov/ing pairs of ossicles are found in the dorsal wall 

 of the pyloric foregut, which is bent so that it is now directed 

 posteriorly. 



XIV. Anterior mesopyloric ossicles. One pair. — These small angu- 

 lar ossicles project sharply from the membrane surrounding them. 

 They are near the median line and below and posterior to the pyloric 

 ossicle (VII). (Figs. 25 B, 26.) 



