RESEARCH ON THE DIGESTIVE SYSTEM OF THE SCHIZOPODA 65 



ber in a vertical direction. The cardiac chamber is remarkably small. The pointed 

 Hnes indicate the direction, of the latéral plates Sj . The form of the paired diver- 

 ticula is indicated by pointed lines. 2/3 in, X 5. 



FIG. 27. Transverse section through the anterior portion of the cardiac cham- 

 ber including a part of the œsophagus with a portion of one of the longitudinal 

 ridges of the œsophagus c. as. 2;'3 in, X 3 



FIG. 28. Transverse section through the middle of the pyloric cavity, showing 

 the latéral grooves gr. in the pièce S3 and those of the latéral pièces S.^. The 

 upper folds S, 5 and SJ are much less developed in Macropsis than in the other 

 species. D, X i- 



FIG. 29. Transverse section through the posterior portion of the pyloric cavity. 

 Above are paired dorsal diverticula div., below and at each side are the inferior 

 pouches or cœca. The concavities at each side of the base of the médian pièce 

 S3 are the entrances to the latéral grooves. The médian pièce in this région cornes 

 into close contact with the fine hairs at the base of the latéral pièces S^ thus 

 separating the upper part of the cavity from the latéral grooves below formed by 

 the pièces S^ and S3 through which the sécrétions from the digestive gland pass. 

 D, X I- . 



FIG. 30. Transverse section showing the opening of the diverticuia in the 

 posterior portion of the pyloric cavity. The terminal portions of the pièces PJ, and 

 5i are shown. D, X i- 



Gastrosaccus. 



FIG. 31. Tranverse section through the posterior portion of the pyloric cham- 

 ber. The dorsal diverticula lie doser together than those of Macropsis. The latéral 

 inferior pockets p. l. i. are more developed than in Macropsis. 2 '3 in, X -5. 



Schistomysis oi-nata. 



FIG. 32. Vertical section through the médian plane of the pyloric chamber. 

 The incurved dorsal diverticulum lies above. The inferior fold S^i is shown; the 

 anterior end inserted behind the terminal point of the ridge c, constitutes the Con- 

 necting fold br„ between S^ and S^i. The pointed lines indicate the situation of 

 the upper and lower terminal free pièces of 5,; P^h, PJ^. 2/3 in, X 5. 



Anchialus. 



FiG. 33 and 34. 



FIG. 33. Vertical section through the médian plane. The œsophagus runs al- 

 most vertically to the cardiac chamber. A fold fl. is shown on the anterior face of 

 the cardiac chamber. The pointed lines indicate the position of the latéral plates 

 5i and the upper folds 5iS. 2;'3 in, X 3. 



