108 MR. H. CHARLTON BASTIAN'S MONOGRAPH 



iinal cells not distinctly tessellated, and containinj^ liglit-coloured fat-particles. Anus 

 YYs" from posterior extremity. Vulva in the middle of body. 



3fale not seen. 



Jlab. With Diatomacese, on the decaying lower leaves oi Mi/riophyllvm verticUlatum 

 from pond, Bagshot. 



7. D. POLTBLASTiTS, n. sp. (Plate X. figs. 50, 51.) 

 Male. Length ^3", breadth -5^". 



External Characters. — Body long and thread-like, tapering but very slightly at either 

 extremity. Head rounded ; no papillae. 



Spear yqoq" long. (Esophagus yth of total length ; posterior half enlarged. Intestinal 

 cells moderately developed, and containing light-coloured fat-particles. Antis 7-fo" from 

 posterior extremity. 



Spicules alg-" long. Suckers 16-20, in mid-ventral region, commencing at 4^" above 

 anus, and occupying a space of'about -^-wo'- 



Female not seen. 



Hab. With Tylelenchiis Davaineii, from moss coating a large boulder in freshwater 

 stream, Falmouth. 



8. D. PAPILLATTJS, n. sp. (Plate X. figs. 52, 53.) 

 Female. Length xo", breadth -22 2""- 



External Characters. — Body opaque-white, tapering gradually anteriorly, but not 

 posteriorly, where it is blunt and rounded. Head truncate, provided with a coronet of 

 six large papillae. Integument with longitudinal striae 4 0^0 " apart. 



Spear ■^" long. (Esophagus ^th of total length, gradually widening posteriorly. 

 Intestinal cells abundant, tessellated, containing light-olive-coloured particles. Anus ^" 

 from posterior extremity. Vnlva near the commencement of middle third of body. 

 Uterus symmetrical. Lateral cell-canals very distinct, owing to their contained granules 

 being of a light olive-colour. 



Movements very sluggish. 



Male not seen. 



Bab. Between the lower sheaths of the leaves of the Giant Fescue {Festuca elatior), 

 Broadmoor, Berks. 



9. D. TORprDTJS, n. sp. (Plate X. figs. 54-56.) 



Female. Length -^", breadth -^". 



External Characters.— ^oAy tapering gradually anteriorly, but more suddenly at 

 posterior extremity, which is acuminated. Head truncate, provided with four small 

 crucial papillae. Integumental markings not apparent. 



Spear 4^" long. (Esophagus about \i}x of total length ; posterior half enlarged. In- 

 testinal cells having a tessellated arrangement. Anus a^o" from posterior extremity. 

 Vulva slightly posterior to middle of body. 



