1889.] 



Western Himalayas and Dehra Dun. 



117 



EXPLANATION OF PLATE III. 



Fig. 1. TyphtBus masoni. Ventral view of the anterior somites, m. month • 

 sp. spermatheoal pore; ?. ovidnoal pores ; rf-. male pores; pWp*. oopulatory 

 papillae ; c. clitellura. The romau numerals indicate the numbers of the somites. 



Fig. 2. Prostate gland, etc., of the left side from tho same worm. ext. apertixre 

 to the exterior (male pore) j v. d. vas deferens ; m. d. muscular duct of the prostate 

 gland ; pr. the prostate gland ; p. s. sac containing penial setse. 



Fig. 3. Penial setiB from the same worm. One of each of the two varieties a. 

 and b. is drawn. 



Pig. 4. Perichwta houlleti. Prostate gland of the left side. ext. aperture to 

 the exterior ; m. d. muscular duet ; pr. prostate gland. 



Fig. 5. Spermatheoa of the same worm seen turned forwards, sp. Sperma- 

 theoal sac proper ; ap\ large oceoal diverticulum ; ap^. small coeoal diverticulum. 



