1HLSBRY : ON THE ANATOMY OF BEDDOMEA. 159 



of kidney and ureter together is one-tenth of the length. The 

 reflexed ureter is as wide as the kidney. The rectal ureter seems 

 to be a closed tube throughout. 



The muscles are as described below for A. albizonatus. As in that 

 species, the retractor of the right eye passes outside both branches of 

 the genitalia. 



The jaw is as described below for A. Cet/lanicus, but has fewer ribs. 



The radula (PL XVI, Fig. 4) is of the form usual in Helices; 

 transverse rows of teeth meeting at a wide angle in the middle. The 

 rhachidian and admedian teeth (Fig. 7, R to 3) have single, long, 

 broadly rounded cusps. These pass by transitions (Fig. 7, 15) into the 

 lateral type, in which the body of the tooth is inclined, and bears 

 a three-lobed cusp (Fig. 7, 25). 



2. Amphidromus (Beddomea) albizonatus (Rve.). — The genitalia in 

 this species (Fig. 5) agree with those of A. intermedins in general 

 features, but differ in the proportions of the parts. The penis is 

 much smaller distally, containing a smaller papilla. The epiphallus 

 is abruptly folded upon itself, the two portions being bound together. 

 Both of these organs are about as long as in A. intermedins, and 

 in both species the penis and epiphallus are about equal in length. 

 The flagellum in A. albizonatus is much shorter, only two-thirds 

 the length of the penis plus the epiphallus, while in A. intermedins 

 it much exceeds their united length ; it lies in longitudinal folds, 

 not spirally coiled. The duct of the spermatheca is also shorter than 

 in A. intermedins. The vagina seems to be shorter, though since 

 this was broken in dissection, I do not venture to give its length. 



The venation of the lung is similar to that in A. intermedins, 

 except that the chief branches of the pulmonary vein stand out less 

 obliquely. The borders of the veins are black-pigmented, as in 

 A. mtermedius. 



The kidney is about four times the length of the pericardium, and 

 over three-fourths that of the lung. 



The retractor of the penis is attached to the diaphragm, as usual. 

 The pharyngeal retractor is united to the right ocular and pedal band 

 far forward ; the left ocular and pedal and the tail retractor are free 

 (PI. XVI, Fig. 1). The right ocular retractor muscle passes outside 

 (to the right of) the genitalia, not between its branches. 



The jaw was lost. Teeth substantially as in A. intermedins. 



3. Amphidromus (Beddomea) Ceylanicus (Pfr.). — The specimen 

 examined was sexually immature, but the characteristic long flagelluiu 

 and sperniatheca-duct were observed, showing the species to be 

 substantially similar to A. intermedins and A. albizonatus in its 

 genitalia. 



The lung is not pigmented, the venation is consequently faint. It 

 is also sparser, and almost wanting on the cardiac side of the lung. 



The kidney is shorter than in A. intermedins, a little less than four 

 times the length of the pericardium, and about two-thirds that of 

 the lunjr. 



