260 



MB. G. C. ROBSON ON THE 



principally occupied by the muscular portion. The floor of the 

 latter shows a distinct ridge which separates the entrance of the 

 fore gut from the intestinal pylorus. The longitudinal muscular 

 folds of the stomach cross this ridge at right angles. In both 

 forms (and in obesa as well) the folds begin abruptly on the 

 anterior side of the ridge, cross it and pass clown the intestine 

 for a short way. Very characteristic is a strongly developed 



Text-fio-ure 7. 



Text-figure 8. 



Text-fig. 7. — Cochlitoma zebra xnv.fulgurata. 



Salivary glands (f 2 ) (semi-diagrammatic). 

 Text-fig. 8. — Cochlitoma zebra vax.fulgtirata. 



Salivary glands (fj) (semi-diagrammatic). 



ridge commencing close to the posterior hepatic orifice and 

 running straight down the proximal part of the intestine. 

 Possibly an incomplete or degenerate typhlosole, it begins as a 

 thick pillar and gradually diminishes in size. On one side it is 

 bent on itself and accompanied by a smaller narrow ridge, which 

 is separated from it by a narrow space. This space is continued 

 up to the posterior hepatic orifice and round the well-marked 

 angle between the ridge on the floor of the muscular portion and 

 its anterior wall. It passes over on to the anterior side of the 

 ridge and communicates with the anterior hepatic orifice. 



