1881.] On certain Points in the Anatomy of Chiton. 123- 



Fig. 1. 





i 



Li 



7t^ (7 





- 



rf/' 





4- 



U 



lc.d. 







cd 







° 13 



y.c. 



o )+ 



1 -. 







a , 5 jl.0. 



kkd. 



\ -' A W ; ' • =t^=/ / 



Ai to 



^^^-^ ' ^^^^ 



A diagrammatic representation of the kidney and generative ducts of Chiton dis- 

 crepans, viewed from the ventral surface. The pallial groove is represented as enclosed 

 by the lines p.g. ; and in it are seen the 16 gills (br.), the generative {g.o.) and renal 

 (r.o.) orifices ; and the anus (a.) The branched nature of the kidney is shown in the 

 anterior part of the figure on the right side ; posteriorly these secreting tubules are 

 omitted. On the left side of the figure the kidney duct alone is indicated. 



a., anus ; br., branchiae ; D, dilated part of kidney duct opening to exterior : 

 g. points to the junction of the generative duct with the generative gland ; the 

 generative gland is supposed to be torn away ; g.d., generative duct ; Tv.Tc., posterior 

 part of kidney duct; g.o., generative orifice; Tc.t., secreting tubules of kidney ; 

 fc.d., duct of kidney running forward, bending round at T and running back, 

 receiving glands as far back as O. From O it runs to the pericardial opening 

 p.o., receiving no glands; p.g., pallial groove ; 13, 14, 15, 16, last four branchiae ; 

 the ventricle and auricular openings are indicated by dotted lines. 



