2 PEOCEEDIXGS OF THE XATIOX.AX, MUSEUM vol. 67 



two small outiciilar protuberances (tig. 7) whose morpliological 

 nature appears uncertain. When vieAved en face, three feebly devel- 

 oped lips surrounding a small opening, the mouth, and Avhat appear 

 to be six rather large papillae could be made out. The esophagus 

 consists of two portions, namely {o) the muscular esophagus proper 

 and [h) the ventriculus (tig. 0). The esophagus proper is lilari- 

 form in shape, its diameter increasing in the posterior portion. In 

 one specimen the esophagus is 1.2 mm. long by 125;a, in maxiunim 

 width in the region of the base, and 62[ji. in minimum width just 

 below the head. In another specimen the maximum width of the 

 esophagus is ITSjjl, The ventriculus is oblong in shape (fig. 6) from 

 22o;jL to 232^1. long b^' 125ti to l78;a. Avide. The intestinal cecum 

 (tig. 6) is long and slender and lies alongside the esophagus. The 

 distance from the top of the intestinal cecum to the base of the ven- 

 triculus, slightly below Mhich the former originates, is 630pL and 

 756[x respectively, in two specimens examined. The intestine ter- 

 minates at a distance of 133;jl from the posterior extremity (fig. 5) 

 and has a more or less uniform diameter, which measures llSyi in 

 the region of the middle of the body. In the anal region a number 

 of structures presumably glands, stand out rather prominently. 

 The tail (fig. 5) ends in a spinose tip which measures about 25[jl in 

 length. Xo opening of the reproductive system or any evidence of 

 the presence of gonads could be distinguished in the specimens 

 examined. 



Host. — BJapf/ui hrevicaud^. 

 Locatian. — Under the skin. 

 Locality. — District of Columbia, 



Type specimens. — United States National Museum. Helminthologi- 

 cal Collections Xo. 26052. 



On June 27. 1923. Dr. E. A. Chapin of this bureau discovered 

 an encysted nematode under the skin in the costal region of a 

 mole {Scalopvs aqucfficus), that had been trapped at Falls Church, 

 Virginia. On July 10. 1923. Doctor Chapin found another encysted 

 nematode under the skin of the same species of mole, trapped in 

 the same locality. Doctor Chapin freed these larvae from the 

 cysts and identified them as belonging to the genus Por?'ocaecu?n, 

 basing his generic determination on the structure of the esophagus 

 and on the presence of an intestinal cecum. One specimen was evi- 

 dently lost or destroyed. The second specimen was returned to 

 Dr. X. A. Cobb of the Bureau of Plant Industry, to whom the 

 material in question belonged and to whom the present writer is 

 "indebted for the privilege of studying it. The present writer is 

 also indebted to Doctor Chapin who furnished information concern- 

 ing the location of the cysts in the host and the appearance of the 

 larvae within the cvsts. 



