CHAP, xi.] EYES : MOLLUSCA. 279 



fat and connective tissue, imbedded in which the ureters could be 

 traced to the infundibula, communicating with the calices and 

 pyramids : thus there was no pelvis within the hilum, but the 

 calices united to form infundibula of which these ureters seemed 

 to be the continuation, and they became united in a pelvis some 

 distance removed from the kidney. There were other signs of 

 abnormal urino-genital development and the author believes that 

 it is almost certain that the abnormality described was congenital 

 and not a sequel of disease. RICHMOND, W. S., Jour. Anat. Phys., 

 xix. p. 120. 



411. Two ureters from one kidney are frequent. For an example, 

 see Gmjs Hosp. Rep., 1883, p. 48. 



TENTACLES AND EYES OF MOLLUSCA. 



412. Subemarginula : specimen having a supernumerary eye on 

 each eye-stalk (Fig. 74, II.). Author remarks that supernumerary 

 eyes are common in forms having eyes borne on tentacles, but are 

 rare in forms in which the tentacle is reduced as it is in Subemar- 

 ginula. FISCHER, P., Jour, de Conch., S. 2, I. p. 330, PI. xi. fig. 4. 



413. Patella vulgata : tentacle and eye repeated on left side (Fig. 

 74, I.). Right side normal. Supernumerary eye and tentacle of 

 normal size. Ibid., S. 3, iv. p. 89, PL vm. fig. 8. 



\ / 



FIG. 74. Repetitions of eyes and tentacles in Molluscs. (After Fischer and 

 Moquin-Tandon.) 



I. Patella vulaata, No. 413. II. Subemarginula, No. 412. III. Helix kermo- 

 vani, No. 416. IV. Clausilia bidens, abnormal, No. 417 ; V. normal of the same. 



