98 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Fig. 15. Interior of the right side of the stomach. The 

 stomach has been opened by a vertical section, 

 a little to the right of the median line so that 

 the median ventral tooth has been removed. 

 The greater part of the cardiac region of the 

 stomach is surrounded by a layer of connective 

 tissue. (a.l.t.) anterolateral tooth ; (d.l.) dorsal 

 lamella; (hep.) hepatopancreatic tubule; (l.c.l.) 

 lateral cardiac lamella; (Let.) lateral cardiac 

 tooth ; (m.a.t.) median anterior tooth ; (oes.) 

 oesophagus; (v.l.t.) ventrolateral tooth; 

 (v.l.p.l.) ventro-lateral pyloric lamella; (v.c.t.) 

 ventral cardiac tooth. 



Fig. 16. Transverse section through the abdominal 

 region. The abdominal appendage of the left 

 side is omitted, (ad. tiss.) adipose tissue cells ; 

 (b.c.) body cavity (haemocoel) ; (br. neph.) 

 branchial nephrocytes ; (br. p. c.) branchio- 

 pericardial canal; (d.l.m.) dorsal longitudinal 

 muscles ; (epim.) epimeron ; (ht.) heart ; (inf. 

 lam.) inferior lamella of gill; (lev. m) levator 

 muscle of appendage; (mid.g.) mid-gut; (p.c.) 

 pericardium; (sep.) septum forming floor of 

 pericardium ; (sup. lam.) superior lamella of 

 gill; (ty.) typhlosole; (vl. hep.) ventro-lateral 

 hepatopancreatic tubule; (v. hep.) ventral 

 hepatopancreatic tubule ; (v. I. m.) ventral 

 longitudinal muscles. 



Fig. 17. Transverse section of two of the rosette-like 

 salivary glands. The left section shows the 

 common duct (c.d.) of the glandular cells, 

 formed by the uniting of the intracellular 

 ducts (ic.d.); n.c.d. is the nucleus of the cell 

 which probably forms the common duct. 



