MOORE: HIRUDINEA OF SOUTHERN PATAGONIA. 68 1 



ejaculatorius is relatively longer than in G. duplicata and frequently makes 

 one or even two turns of a spiral in passing to the prostate cornua of the 

 atrium. 



With the exception that the gastric caeca are considerably longer, the 

 alimentary canal differs in no important feature from that of G. duplicata. 



There is never any appearance of subdivision of the annuli, although 

 the superficial annular lacunae are developed as in G. duplicata. In all of 

 the specimens examined by me the nuchal plate is thin and transversely 

 elongated, sometimes merely occupying a chink between VII aj and VIII ai. 



Blanchard found this species to be very numerous in the collections 

 from the region bordering on the Straits of Magellan. In the uplands it 

 seems to be less frequent than some of its allies. 



No. 7. " Small running stream south side of Rio Chico, 25 milesabove 

 Sierra Oveja, Feb., 1899." 9 specimens. 



No. 19. Large spring at same locality. 2 specimens. 



No. 22. " Large spring 30 miles above Sierra Oveja, Rio Chico, Feb., 

 l8 99-" 35 specimens, some of which are marked by the paired longi- 

 tudinal dark lines noted by Blanchard. 



No. 48. Rio Blanco, i specimen. 



GLOSSIPHONIA SIMPLEX sp. nov. 



(Plates XLIX, Fig. 11 ; L, Figs. 15, 23, 24.) 



The nearest ally of this species is Glossiphonia lineata (Verrill), from 

 which it is distinguished by having somites HI and IV uniannulate in- 

 stead of biannulate, and a single series of cutaneous papillae present on 

 every annulus instead of three series developed on the neural annuli only, 

 as in G. lineata. 



G. simplex is broad, flat-bodied and thin, in which it contrasts greatly 

 with G. (Helobdella] michczlseni R. Blanch., which in annulation and 

 anatomy it closely resembles. The annuli are very distinct, and the 

 margins, especially posteriorly, almost serrated. The oral sucker is small, 

 with thick margins and a rather deeply depressed center, in the anterior 

 part of which the large mouth is situated in somite III. The deeply pig- 

 mented eyes are in IV and are very conspicuous, owing to their large 

 size and the nearly color less areain which they lie. A median, slightly 

 enlarged area on annulus VIII ai represents a small nuchal gland, but 

 there is no nuchal plate, except in two specimens, in which it is very thin 



