Farnie.— 77jf Structure of Ampliibola crenata Marfj/u. 



73 



runs along the dorsal surface of the kidney serves this purpose, by com- 

 pressing the flow and so driving the stuff forwards to the pore. 



Lying on the roof of the mantle-cavity, close to the anterior end of the 

 kidney, and extending a short distance underneath it, is an oval mass of 

 white rounded particles covered by a thin pigmented membrane (hy). It 

 is situated in a curious depression which extends from the anterior end of 



Fig. 3. — General dissection ( X 2). The mantle, which has been cut along the collar 

 and along the right side, has been turned to the animal's left, exposing the 

 pallial comi^lex. The head and neck have been opened to disclose the 

 alimentary tract and part of the genital system. The rectal sinus has been 

 severed at the point se, where it passes on to the roof of the mantle -chamber. 

 ag, albumen-gland ; as, anterior sinus ; c, crop ; re, cut edge of collar ; 

 cd, common genital duct ; ce, cut edge of mantle ; d, depression in front 

 of renal pove ; dgl, digestive gland ; div, diverticulum of oesophagus ; 

 ex, excretory pore ; g, groove into which anus opens ; gp, genital 

 pore ; gz, gizzard ; hgl, hermaplirodite gland ; hi/, hyj^obrancliial gland ; 

 irs, inferior rectal sinus ; int, intestine ; k, kidney ; I, lung ; Id, duct of 

 digestive gland ; m, mouth ; mc, collar ; mv, muscle-band on kidney ; 

 06', osphradium ; pa, pulmonary aperture ; pe, penis ; ])r, prostate ; pv, pul- 

 monary vein ; r, rectum ; se, cut end of rectal sinus ; sg, salivar,y gland ; 

 srs, superior rectal sinus ; st, stomach ; I, tentacle. 



the kidney to the edge of the mantle above the pulmonary aperture. When 

 these particles are disturbed with a brush they give off a bluish fluorescent 

 foam, which quickly re-forms as often as it is brushed away. When 

 examined under the microscope the mass is seen to be made up of 

 rounded particles of different sizes, which contain crowds of small granules. 

 Though white by reflected light, the particles are brown by transmitted 



