NEW ENTOZOO:^ FROM THE OSTlllCir. 185 



Prom this cause an iuexperieuced observer might readily mi.stalio 

 the cup-shaped iuvertcd portion for tlie lining membrane of a larcTc 

 buccal cavity. The oral opening leads to a small oesophageal tube, 

 which for a short distance is strengthened by chitiuous thickeu- 

 ing. The head itself is something less than yJ^.^. JQch in breadth, 

 the extremity of the tail in the female being less than jJ-^-^ inch 

 in diameter. 



The internal reproductive organs of the male show a simple 

 vas deferens or tubal prolongation from the seminal receptacle ; 

 but the short, broad, and uncleft spicules are to some extent cha- 

 racteristic of the species. They present an average length of 

 2^ inch by jj-^- inch in breadth. 



The accessory appendages are especially noteworthy. In general 

 configuration and ray-distribution, the hood approaches the 

 pattern found in Strongylus ventricosus ; but this latter strongyle 

 is very much larger. In breadth the hood of Strongijlus Douglassii 

 measures y^ inch, whilst its vertical diameter is about -^^ inch. 

 In this species the anterior ray is split into two widely diverging 

 branches, the lower being paramount. A similar peculiarity is 

 found in the anterior ray of S. ventricosus of the ox and deer, in 

 8. nodularis of ducks and geese, and in S. retortceformis of the 

 hare ; at least Schneider has so represented the character of the 

 anterior ray in these species. In 8. Douglassii both the ray- 

 divisions are papillated at their points ; but I did not notice 

 papillary terminations in any of the succeeding rays. The thumb- 

 and-finger-like appearance of these upper ray-divisions is very 

 striking. The antero-lateral ray is comparatively large. The 

 middle ray is divided to the base, its portions being nearly equal. 

 The postero-lateral ray is narrow, and does not extend to the 

 border of the hood. The posterior ray is united to its fellow of 

 the opposite side ; it is long and narrow, bifurcated at the lower 

 third, the inner brancli being also forked. All the divisions of 

 the posterior ray extend to the circumferential margin of the 

 hood, which, at this (the lowermost) point slightly projects, as if 

 forming a rudimentary third lobe. The hood-membrane itself 

 displays the usual radiating strise, bespeaking its integumentary 

 origin; and above it the ventral surface of the body is marked by 

 several undulating lines or ridges directed obliquely outwards. 



The internal reproductive organs of the female worm, while 

 conforming to the nematode type generally, show the uterine and 

 ovarian portions very distinctly. The vulva is situated -^ inch 



13* 



