Haddon — 0)1 Generative and Urinary Bucts in Chitons. 229 



Fig. 1. 



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

 crepans, viewed from the ventral surface. The branched natui'e 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 ; hr., the 16 branchiae ; D, dilated part of kidney duct opening to exterior ; 

 g, generative gland, the greater portion of which is removed : g.d., generative duct ; 

 g. 0., generative orifice ; h.Jc., posterior part of kidney duct ; k. t., secreting tubules of 

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

 receiving glands as far back as : from it runs to the pericardial opening ^.o., re- 

 ceiving no glands; p.g., pallial groove; r.o., renal orifice; 13, 14, 15, 16, last four 

 gills ; the ventricle and auricular openings are indicated by dotted lines. 



SCIEN. PROC. R.D.S. — VOL. IV. PART V. Y 



