castle: north American rhynchobdellip^. 41 



position it may be described as terminal rather than ventral (the position 

 which it occupies in other species). 



c. Reproductive Organs. 



The genital pores have the same position as in G. stagnalis and G. fusca ; the 

 male {po. $, Figure 27), between the first and second rings of somite xii., the 

 female {po. 9 , Figure 27), between the second and third rings of the same 

 somite. 



^■rt-r^ I. 





Figure B. — G. elongata. Ventral view of liead end, showing annulation of head 

 somites and position of marginal sensillee. 



Testes (te., Figure 27), six pairs placed intersegmentally in somites 



XIII. XVIII. 1 , • , 



• ' as regularly in the genus. 



XIV. XIX. n J , & 



The ovaries {oa., Figure 27) have the typical structure and position which 

 they possess in other species (see p. 25). The eggs and egg-laying of this 

 species I have not observed. 



d. Digestive Tract. 



The mouth (or.. Figure 23, Figure B) opens about in the middle of the oral 

 sucker. The proboscis (pr''b., Figure 27) commonlj' extends over about four 

 somites (viii.-xi.). The salivary glands (gl. sal.) are found chiefly in so- 

 mite XII., though a few may lie in the adjacent somites, xi. and xiii. About 

 thirty good-sized gland cells are found in either half of the body. In size, 

 number, and position the salivary glands of this sjiecies resemble those of G. 



