NO. 2131. 



NEMATODE PARASITES OF RODENTS—HALL. 



43 



.<^V"^ 



middle of the outer base of the adjoining lip. These spines aie Hat. 

 The transition from one to another at their bases is in the form of a 

 bow, and anteriorly they usually branch 

 dichotomously. The intestine has two 

 ceca projecting toward the esophagus. 



31 ale 46 mm. long. The simple bare 

 spicule projects forward from a very short 

 tail. This tail (fig. 49) bears a double row 

 of papillae on each side. Schneider figures 

 9 preanal and 10 to 12 postanal. 



Female 90 mm. long. Uterus with two 

 branches. 



Hosts. — Procavia cape7isis {Tlyrax capensis)., Procavia syriaca 

 {Hyrax syriacus). 



Fig. 48.— Ceossophorus collaris. 

 Median view of the dorsal up. 

 X 90. After Schneider, 1866. 



-Cecum. 



-Shores of the Red 



Location.- 

 Locality.- 

 Sea. 



Schneider (1866) used the 

 name Ascaris ferox., crediting it 

 to Hemprich and Ehrenberg, 

 and at the same time noting 

 Crossophorus coUaris of Hem- 

 prich and Ehrenberg as a 

 synonym. Hemprich and 



Ehrenberg do not use the term 

 Ascaris ferox and, so far as can 

 be determined, it is a deliberate 

 renaming. 



In his description, Schneider 

 says the male tail bears a 

 double row of papillae and 

 adds " 1 steht ganz seitlich." It is not clear whether this means that 

 one row, the outer on each side, is entirely lateral or that one papilla 

 is entirely lateral, and his figures do not definitely afiirm either idea, 

 though leaving a presumption in favor of the first. 



CROSSOPHORUS TENTACULATUS Hemprich and Ehrenberg, 1828. 



Synonym. — Ascaris tentaculatus Ehrenberg of Nassonov (1897). 



Specific diagnosis. — Crossophorus (p. 42) : Head not distinctly 

 separated from the body. Mouth provided with papillae and each 

 lip bearing three very long tentacles. Worms 2 to 3 inches (about 

 5 to 7.5 cm.) long. 



Male not specifically described. 



Female not specifically described. 



Host. — Procavia capensis {Hyrax capensis). 



Fie. 49.— Crcssophorus collaeis. Posterior 

 extremity of male; ventral view. x 130. 

 After Schneider, 1866. 



