80 H. J. PLEUHE. 



After sampling the fluid contents of the pericardium the 

 contents of the right kidney were examined, and proved in 

 several cases to be roughly divided into two sorts of material 

 — darker brown fluid with excretn, and lighter coloured fluid 

 containing both excreta and ova. Just behind the opening 

 into it of the oviduct the kidney is partially subdivided by 

 an internal projection of its right wall. The two parts are 

 respectively an anterior one containing ova as well as excreta, 

 and a posterior one containing almost solely the latter 

 (see fig. 4). 



From these finds of ova it seems justifiable to conclude — 



a. That the gonaduct opens into the right kidney (G r 

 into 7 r). 



b. That the right kidney has a pericardial pore (5). 



c. That the anterior part of the right kidney is becoming 

 connected more particulai'ly with the reproductive system. 



Injections of the right kidney were rather unsatisfactory, 

 as might be expected considering its large size ; but injection 

 from the pericardium, on the other hand, showed very dis- 

 tinctly a pericardio-renal communication (5) near the anterior 

 right-hand corner of the pericardial cavity (8). 



By careful dissection of uninjected specimens from the 

 pericardial side, an opening was found high up on the right 

 wall of the pericardium, near its anterior right-hand corner. 

 A fellow-student. Miss A. Ritchie, kindly confirmed this for 

 me in another specimen. 'J'he opening as seen in dissection 

 seemed fairly distinctly lipped, and is possibly imperfectly 

 valvular; it is situated near the point where the duct-like 

 portion of the kidney may be said to begin (5). 



Further along toward the external opening, the wall of the 

 functional kidney comes near that of the papillated sac; I 

 have not, however, been able to find any interrenal communi- 

 cation such as Haller describes for Haliotis glabra. 



Despite numerous attempts, by dissection, by examination 

 of contents, and by injection, I have not been able to find 

 evidence of a pericardial communication with the papilhited 

 sac, a conclusion in accord with that of Haller, but not with 



