3l6 CALIFORNIA ACADEMY OF SCIENCES. 



EXPLANATION OF THE FIGURES. 



Plate XI. 

 Kerria McDonaldi, fig. 1 to 12. 



Fig. 1. Semi-schematic view of the orgaus of the anterior somites as 



seeu from above. 

 he. buccal cavity. 

 hr. braiu. 

 jihx. pharynx. 



si. gl. salivary glands of the pharynx. 

 s. (jl. septal glands of the oesophagus. 

 iiph. nephridia. 

 i^pth. spermatheca. 

 (Irt. diverticula of the oesophagus seen from above; partly hidden 



by the oesophagus. 

 h. heart. 

 us. sperm-sacs. 

 0. ovary. 

 0(1. oviduct. 

 s. seiDta. 

 rl. clitellum. 

 pr. prostates. 

 V. gl. ventral ganglion. 

 s. i. sacculated intestine. 

 sp. (I. sperm ducts. 

 Fig. 2. Some of the organs of the anterior somites seen from the side in 



a longitudinal section. The nejihridia are not delineated and only 



a part of the vascular system is shown. 

 prst. prostomium. 

 per. peristomium. 

 phx. pharynx. 

 si. gl. salivary glands. 

 br. brain. 

 fes. oesophagus. 

 s. gl. septal glands. 

 (Ivt. diverticulum of the oesophagus. 

 h . hearts . 

 d. V. dorsal vessel. 

 V. 2'. ventral vessel. 

 s. I. sacculated intestine. 

 t. i. tubular intestine. 



