14 



\\ hifli prdjtM't into the cavity of tlif stomach. The dorsal 

 Avail of the stomach is almost flal. and is continuons 

 l)osteriorly with tlic mid-g-ut. The anterior end of 

 the stomach is sligditly oblitjue, and when seen 

 from the upper surface is semi-eircuhir. The plates 

 and " teeth " wliich foiin the gastric mill are 

 arranged in the fcdlowing manner. ( >n each of 

 the lateral margins cd' the anterior end of the stomach 

 a hilobcMl ampulliform tritniating ' tooth ' (Fig. 1-3, Let.) 

 arises, and meets its fellow of the opposite side above the 

 opening of the oesophag-us. These lateral cardiac teeth 

 are the (diief masticatory agents of the gastric mill. 

 Between these, on the anterior wall of the stomach, three 

 teeth till up the space, a small median anterior tooth 

 (m.a.t.) situated between two antero-lateral teeth (a.l.t.). 

 Posteriorly, the closure of the entrance to the stomach is 

 effected by a ventral transverse setiferous ridge, the 

 ventral cardiac tooth (v.c.f.). In the ])receding descri})tion, 

 the word ' tooth ' has been used to designate a chitinous 

 })rotuberance of the wall of the stomach, which is covered 

 with short, closely-set, re-curved setae. (h\ the ventral 

 side (»f the stomach, in the middle region, three tooth- 

 shaped processes arise, their apices directed backwards; 

 they are the median, veutial and ventro-lateral teeth 

 (r.Lt.). On each side of the cardiac region of the stomach, 

 a narrow lamella, the lateral cardiac lamella (l.c.L) runs 

 in an oblique direction from the antero-dorsal region to 

 the ventral side, and terminates near the ventro-lateral 

 tooth. In the pyloric region of the stonmch. a deep 

 invagination of the dorsal surface forms a broad dorsal 

 lamella (d.h), which extends across the dorsal side and 

 half-way down the lateral sides. Between the lateral 

 portions of the dorsal lamella and the wall of the stomach, 

 two large lamellae (rJ.p.f.) have their lateral limits; these 



