ATTSTENIA. 



193 



The length of the animal, when fully extended, is about 

 6 inches. A considerable portion of the shell remains exposed 

 (this doubtless varies in extent). The teetli of the radula are 

 thus arranged : 69 . 3 . 22 . 1 . 22 . 3 . 69 (94 . 1 . 94) ; the number 

 of broad inner lateral (admedian) teeth being very larse. The 

 rhachidian tooth is bluntly tricuspid, the next 6 on each side have 



[Fig. 67. — Austenia gigas. 



A. Auiraal from a spirit-specimeu, viewed from both the right, and left sides, 



showing shell- and dorsal lobes ; in the former, cav. is the posterior end 

 of the cavity in the foot occupied by the internal organs. 



B. Genitalia: the sperinatiicca filled with spermatophores. 



C. A spermatophore taken from the sperinatheca. 



D. Penis, showing spermatophore in process of formation. 



E. Jaw and teeth of the radula.] 



o 



