ON THE ANGUILLULID^. 121 



'Pharyngeal cavity ttts" long. Oesophagus |th of total length. Intestinal cells in- 

 distinct. Anns 4^0" from iiosterior extremity. Vulva about middle of body. Excre- 

 tory duct opening near middle of oesophagus. Latei^al vessels commencing at t^" fi"oni 

 anterior extremity. 



Ifale, not seen. 



Sab. About the rootlets of oats from sandy soil, Broadmoor, Berks. 



9. P. FUSiFORMis, n. sp. (Plate X. figs. 95, 96.) 

 Female, length ^", breadth 5-!^". 



External Characters. — Body tapering considerably, both anteriorly and posteriorly. 

 Head truncate, leaving no papillte, but provided with four small setae. Integument 

 with transverse striae, too W apart. 



TJiaryngeal cavity long and narrow. (Eso-phagus ^th of total length. Intestinal cells 

 containing few light-coloured granules. Anus 2x0" from posterior extremity. Vulva 

 slightly posterior to the middle of body. Excretory duct opening opposite commence- 

 ment of posterior ^rd of oesojihagus. Lateral vessels commencing at T2V0" from anterior 

 extremity. 



Hale, not seen. 



Hah. Tuft of bright-green moss from thatched roof, Sandhurst. 



10. P. RiVALis, Dujardin. 



Enoplus rivalis, Dujardin, Hist. Nat. des Helminthes, p. 235. 



" Corps blanc, filiforme, aminci en arriere, long do 2'"'"-23, large de 0""", quarante 

 fois aussi long que large; tete large de 0'"'""28, tronquee en avant ct ht'rissce de 

 quelques soies roides ; bouche armee interieurement de trois pieces etroites, arquees, 

 qui so reunissent a 1' entree de ra3Sophage ; oesophage musculeux, cyliudrique, long de 

 0'"'""3i, termine par un petit vcntricule, que precede mi leger etranglement. 



" Femelle longue de 2"""-23 a 3'"'", large de 0"""-055 :i 0'"'"-08, a queue insensible- 

 ment amincie, et terminee par un petit renflement d'oii part une soie courte ; vulve 

 situee un peu en avant du milieu; uterus divis6 en deux branches opposces, qui, ar- 

 rivees a 0''""'30 ou 0"'"'"45 en avant et en arriere de la vulve, se recourbont pour so con- 

 tinuer avec les ovaires corresjoondants qui reviennent de part et d'autre jusqu'au-dessus 

 de la vulve commes deux larges tubes contenant une pile d'oeufs comprimes; CBufs 

 elliptiques, longs de 0'""06." 



" Je I'ai trouviS dans I'eau de la Seine, a Paris, et dans I'eau ccurante d'une fontaine 

 a Blagnac, pres de Toulouse, ainsi que dans la Vilaine, a, Rennes." 



I cannot feel certain about the genus to which this animal belongs, Imt have placed 

 it in that to which the nature of its oesophagus allies it most : it is evidently not an 

 Enoplus. 



10. APHELENCHUS \ Bastian. 



Gen. Char. Body tapering more or less at extremities ; posterior pointed, or blunt and 

 rounded. Caudal sucker, if present, very small. Integument having transverse 



' afeXi'is, simple, and e'yxos, a spear. 

 VOL. XXV. R 



