CASTLE: NORTH AMERICAN RHYNCHOBDELLIDZ. 4] 
position it may be described as terminal rather than ventral (the position 
which it occupies in other species). 
ce. 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 x1I., the 
female (po. 2, Figure 27), between the second and third rings of the same 
somite. 
Ficure B.— G. elongata. Ventral view of head end, showing annulation of head 
somites and position of marginal sensillz. 
Testes (te., Figure 27), six pairs placed intersegmentally in somites 
= XL. | XVINT. 
XEVs | XEX 
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. 
» as regularly in the genus. 
_d. Dicestive TRACT. 
The mouth (or., Figure 23, Figure B) opens about in the middle of the oral 
sucker. The proboscis (pr’b., Figure 27) commonly extends over about four 
somites (vi.-xI.). The salivary glands (gl. sal.) are found chiefly in so- 
mite x1I., though a few may lie in the adjacent somites, x1. and x1. About 
thirty good-sized gland cells are found in either half of the body. In size, 
number, and position the salivary glands of this species resemble those of G. 
