44 PROCEEDINGS OF THE NATIONAL MUSEUM. yol. 50. 



Location. — Cecum. 



Locality. — Shores of Red Sea. 



Hemprich and Ehrenberg state that this species is rarer than 

 Crossophoinis collaris. The descriptions suggest that the two species 

 do not belong in the same genus, but in the absence of an adequate 

 diagnosis of Crossophorus tentaculatus no satisfactory separation is 

 possible, and there is the possibility that further study might show 

 them to be congeneric. 



The name Ascaris tentaculatus^ credited by Nassonov to Ehrenberg, 

 must be credited to Nassonov as Ascaris tentaculatus (Hemprich and 

 Ehrenberg, 1828) Nassonov, 1897. 



Family HETERAKIDAE Railliet and Henry, 1914. 



Synonym. — Heteracidae Railliet and Henry, 1914. 



Family diagnosis. — Ascaroidea (p. 39) : Polymyarian. Mouth pro- 

 vided with two or three lips or without lips and of variable shape. 

 Esophagus cylindrical or club-shaped, often followed by a distinct 

 bulb. Males with a preanal sucker, which may be limited by a 

 chitinous ring or a delicate cuticular membrane, or formed by a 

 simple longitudinal depression; this sucker not present in Seuratum. 

 Two spicules, one or both of which may tend to atrophy or show im- 

 perfect chitinization, and with accessory piece present or absent. 

 Vulva near middle of body. 



Type-genus. — Heterakis Dujardin, 1845. 



ANALYTICAL KEY TO SUBFAMILIES OF HETERAKIDAE. 



1. Month with 2 lips, anal sucker absent in male Seuratinae, p. 62. 



Mouth with 3 lips or with lips inconspicuous or wanting 2. 



2. Mouth with 3 well-defined lips ; preanal sucker nearly circular and limited by 



a chitinous ring Heterakinae, p. 44. 



Mouth with lips inconspicuous or wanting, rarely with 3 lips ; preanal sucker 

 fusiform and without a chitinous ring Subulurinae, p. 51. 



Siabfamily HETERA-KllSr^E Railliet and. Henry, 191S&. 



Suh family diagnosis. — Heterakidae (p. 44) : Mouth with three 

 well-defined lips; esophageal bulb present or absent; preanal sucker 

 nearly circular and limited by a chitinous ring; spicules equal or 

 unequal; gubernaculum present or absent. 



Type-genus. — Ileteralds Dujardin, 1845. 



Lane (1914) proposes the subfamily Heterakinae in a strict sense 

 as "sub.-fam. nov." The name of the subfamily must, of course, 

 date from the person proposing it, not from the person restricting 

 it or rewriting its diagnosis. 



ANALYTICAL KEY TO GENERA OF HETERAKINAE. 



3. Bursa well developed; no gubernaculum HeteraJds, p. 45. 



Bursa not developed; gubernaculum present Paraspidodera,p.4:9. 



