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PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 50. 



esophageal bulb, the ovaries being side by side in the prevulvar re- 

 gion. Eggs numerous, containing an embryo when oviposited, and 

 70 to 77 [X long by 63 to 65 [x thick. 



Host. — Dipodillus campestris {Dipodilla campcstris) . 



Location. — Cecum. 



Locality. — Bou-Saada, Algeria. 



In a previous paper Seurat (1914a) has noted that 

 Allodapa has the ovijector directed anteriorly. I 

 have queried in the foregoing his statement that 

 A. elongata has the ovijector directed posteriorly. 



SETJR.A.TIN"A.E Hall, 191G, new sialofamily. 



Subfamily diagnosis. — Heterakidae (p. 44): 

 Transitional forms in which the male is without an 

 anal sucker. Mouth with two lips. No esophageal 

 bulb present. Male with short, equal, or subequal 

 spicules, and with a gubernaculum. Vulva near 

 middle of body. Uteri divergent. 



Type-genus. — Seuratum Hall, 1916. 



\-—a 



Fig. 72.— Allodapa 

 elongata. poste- 

 eioe extremity of 

 female; ventral 

 VIEW, a, Orifice 



OF CAUDAL gland. 



Enlarged. After 

 Seubat, 1914. 



SEURATUM Hall, 1916, new genus. 



Synonym. — OphiostomAim Creplin, 1839, of Seu- 

 rat, 1915«. 



Generic diagnosis. — Seuratinae (p. 62) : Charac- 

 ters of the subfamily. 

 Type-species. — Seuratum tacapense (Seurat, 1915a) Hall, 1916. 

 This genus is named after Seurat, in recognition of his consider- 

 able contributions to nematology, especially in regard to the structure 

 and importance of the female genitalia. 



SEURATUM TACAPENSE (Seurat, 1915a) Hall, 1916. 



Synonym. — Ophiostomum tacapense Seurat, 1915a. 



Specific diagnosis. — Seuratum (p. 62) : Slender worms, attenuate 

 at both extremities, the posterior extremity terminating in a small 

 mucronation. Cuticle with fine transA'erse striations at intervals of 

 10 )u, and with 64 longitudinal bands, very straight, dark, and pre- 

 senting in the median line of each band a dentiform thickening of the 

 transverse striations, the point of this dentiform structure being 

 directed posteriorly (fig. 73). The straight lateral lines are 60 \i 

 wide. No lateral alae present. There are numerous long straight 

 muscle cells. There are two not very prominent cervical papillae, 

 situated about two- fifths of the length of the esophagus from its 

 anterior extremity. The excretory pore is very small and opens 



