2 PBOCEEDINGS OF THE NATIONAL MUSEUM. vol.65. 



two slender prebursal papillae. Dorsal ray quadridigitate, externo- 

 dorsal slender, postero-lateral and medio-lateral stout, subequal. 

 extenio-lateral more slender, ventrals subequal, stout, separated to 

 base. Spicules long, slender, simple, gubemaculum small, simple. 

 Vulva just before anus, vagina short, ovejector, and sphincter mus- 

 cles not developed, uteri two and convergent. Eggs oval with thin 

 shells, not embryonated within uterus. 



Genotype. — Sauricola sauricola, new species. 



As may be seen from the above diagnosis, this genus is rather 

 closely related to the oesophagostomes, or nodular worms, from 

 which it differs in the very short and thick esophagus, the absence 

 of cervical papillae, the position of the excretory pore and the con- 

 vergent uteri without muscular ovejectors. Apparently, this worm 

 does not produce nodules in the intestine of the host. 



SAURICOLA SAURICOLA, new species. 



Specific diagnosis. — SauHcola; body cylindrical, tapering slightly 

 at extremities. Cuticle about 30[ji. thick, with very coarse transverse 

 striae. Mouth short, chitinous framework of buccal capsule 100;j. 

 in outside diameter, walls 15[jl thick and 22a high. Outer leaf crown 

 of short and broad elements, inner crown of long slender acutely 

 pointed blades which project beyond the opening of the mouth. 

 Eighteen elements in each crown (fig. 1). Lateral papillae stout, 

 each with an internal process at apical third. Esophagus 300[jl long, 

 (fig. 2), 170|JL thick, walls in anterior part thickly studded with stout 

 conical teeth, nerve ring 180[;. behind the buccal capsule. Excretor\' 

 pore 570[JL back of mouth collar. Intestine composed of two layers, a 

 thin inner chitinized layer Sjj. thick and a thick outer muscular layer 

 of varying thickness, averaging 50[a in thickness. Lumen of in- 

 testine of large diameter, about 50[jl. 



Male. — Tips of the inner of the four subdivisions of the dorsal ray 

 reach the edge of the bursal membrane. Ventral rays separate near 

 their origin (fig. 3). Externo-lateral arises near base of the com- 

 bined medio- and postero-laterals. Separation of medio- and pos- 

 terio-laterals occurs slightly beyond apical third of length. There 

 is a dorsal process from the main trunk just before the separation 

 of the lateral rays, as in Oesophagostommm radiatum. Externo-dor- 

 sal arises near base of dorsal trunk, which bifurcates at the middle 

 of its length. Spicules (fig. 4) slender, equal, 2.36 mm. long. Guber- 

 naculum 68[ji. long. 



Female. — Similar to male in size and general conformation. Pos- 

 terior extremity of worm (fig. 5) mucronate, external opening of 

 alimentary canal opens 115[x in front of the extreme apex of worm, 

 external cuticle extends 140(a into the worm to the true anus. Vulva 

 opening 140[j, in advance of the external opening of the intestine. 



