PEROPHORA ANNECTENS. 83 



LIST OF ABBKEVATIONS USED IN THE FIGURES. 



<i. auus. 



at. atrium. 



at. 0. atrial orifice. 



h. c. blood corpuscle. 



hd. buds. 



h. s. blood siuus. 



br. 0. branchial orifice. 



br. s. branchial sac. 



c. h. h. inner ciliated baud. 



c. c. clear cells of stomach. 



€. d. digestive cells of stomach. 



c. g. cuticular granules on the inner surface of the wall of the duodenum. 



c. ff . coagulated blood plasma (?). 



c. m. circular muscle fibres. 



c. m'. and r. m. circular and radial fibres which interweave. 



con. d. connecting duct of internal i^apilla. 



cce. coecum of chylific vesicle. 



c. V. vessels crossing peribrauchial chamber. 



d. g. subueural gland. 

 d. I. dorsal lamina. 



d. in. dorsal muscle fibres. 

 d. t. dorsal tubercle. 

 dv. duct of dorsal gland. 

 ed. endostyle. 



ep. V. epithelium lining stolonic vessel. 

 ed. v\ epithelium of stolonic vessel in tangential section. 

 ep. h. epithelium of exterior of body. 



ep. i. epithelium of inner surface of branchial siphon, with long pro- 

 cesses. 

 ep. s. epithelium of interior of branchial sac. 

 g. c. glandular cells of intestinal coeca. 

 g. cce. pits of the duodenum. 

 gl. ganglion. 

 hi. d. heart diastole. 

 ht. s. heart systole. 

 hi/, hydroid stem. 

 i. g. c. inner glandular cushion. 

 i. zo. isolated zooids. 

 int. intestine. 

 mt' . duodenum. 

 int". intestine proper. 

 i. p. internal papilla. 

 I. languet. 



