102 MR. H. CHARLTON BASTIAN'S MONOGRAPH 



vergence of the bright lines representing the lumen. Intestinal cells well marked. 

 Anus xtt" fi'om posterior extremity. Vulva at middle of body. 



Mule, not seen. 



ILah. Small freshwater pool, in boggy ground, amidst decaying moss and liverwort, 

 Falmouth. 



4. M. TUNBRiDGENSis, n. sp. (Plate IX. figs. 31, 32.) 



Female, length yj", breadth ^fo"- 



External Characters. — Body scarcely tapering at all anteriorly, except quite at the 

 extremity, opposite the pharyngeal cavity, where it becomes suddenly diminished in size ; 

 posteriorly it narrows rather abruptly behind anus, and then terminates in a curved 

 filiform extremity. Head small, rounded ; no papillae. Integument having longitudinal 

 stria? 7-51J0 " apart. 



Fharyngeal cavity elongated, someAvhat narrowed in the middle, Trrs"" long. (Eso- 

 l^hagus |th of total length, uniform in size. Intestinal cells containing yellowish-coloured 

 granules, and having a tessellated arrangement. Anns o^" from posterior extremity. 

 Vulva slightly posterior to middle of body. 



Male, not seen. 



Hah. In fine sedimentary sand of small pond, Tunbridgc Wells 



1 



5. M. crasTATUs, n. sp. (Plate IX. figs. 33, 34.) 

 Female (immature), length ■^", breadth -^q"' 



External Characters. — Body tapering very slightly anteriorly, but more considerably 

 posterior to the anus, where it gradually narrows to a point, and is provided on the 

 dorsal surface with an integumental prolongation or crista, whose greatest breadth is 

 x^tg". Head truncate, provided with a minute papilla above and below. Integu- 

 mental striae in-\dsible. 



Pharyngeal cavity large, oval, Avith one hook-like projection. Oesophagus between 

 ^rd and ^th of total length, uniform in size. Intestinal cells not distinctly tessellated, 

 containing small pale granu.les. Anus tst" fi'om posterior extremity. Vulva consider- 

 ably posterior to the middle of body. 



Male, not seen. 



Ilab. In moss, Falmouth. 



6. M. FOVEAEXJM. 



Oncholaimus fovearum, Dujard. Hist. Nat. des Helminthes, p. 2.36. 



" Corps trente a trente-trois fois aussi long que large ; tote un peu anguleuse ; cavitc 

 l)uccale oblongue, armee de deux on trois pieces etroites, portant chacune (?) mie forte 

 dent en avant du milieu ; ocsophage long de 0""""37. 



" Femelle longue de 2"""-5, large de 0'"'"'075, Ji queue amincie, assez longue, con- 

 servant une meme longueur de 0'"'"'011 dans sa dcrnierc moitie, et terminde par une 



' This species was very abundant in the specimen of mud selected ; and as it was the first example of one of the free 

 Nematoids that was carefully submitted to examination by me, iu May 18G3, I have retained the name of the place 

 where it was found as a specific appellation. 



