148 MR. H. CHARLTON BASTIAN'S MONOGRAPH 



» 



others frequent about posterior extremity, especially in the male ; ce25halic papillae 



often present. JPharijugeal cavity none or indistinct, but in its situation three 

 distinct horny jaws or teeth, more or less bilobed at their extremities. (Esophagus 

 not distinctly muscular, nearly uniform in size, often much stained with pigment, 

 especially at the anterior part ; no distinct oesophageal ring. Intestine well covered 

 with dark pigment-granules often distinctly tcssellate in arrangement. Vulva 

 .about middle of body. Uterus bifid; segments symmetrical. Spicules large, 

 curved, and, together with two strong lateral accessory pieces, of a yellowish-brown 

 colour. Svpjileuiental organ of same colour, large, oblique, funnel-shaped. Ocelli 

 (pseud.) occasional, owing to more distinct aggregation of the usual pigment-matter 

 of oesophagus ; sometimes on or external to oesophageal sheath (?). Excretory 

 ventral gland tubular, opening about the termination of anterior third of oesophagus. 

 Lateral canals distinctly cellular, 

 MoA'ements moderately active. 



This is a very interesting genus, inasmuch as it appears to reveal to us the most rudi- 

 mentary condition of the ocelli, which are found more specially developed in the species 

 of other genera, such as Thanoderma and Leptosoniatmn. Here we find, in several 

 species, a simple local increase in the aggregation of the pigment, in two or three patches, 

 on the anterior part of the esophagus, it being also more or less scattered over its whole 

 -extent, whilst in Enoplns inermis it is wanting in all parts of the oesophagus, save in 

 two rather distinctly defined ocelli-like masses, which seem, however, to be still situated 

 beneath instead of on the sheath of the oesophagus, as is so evidently their situation in 

 the genera above named. 



In this genus also are included many species of free Nematodes which have been dis- 

 covered by other observers, ])ut whose real position and nature are stUl very doubtful, 

 either from the insuflicient or unsatisfactory nature of the details concerning them. 



1. E. COMMUNIS, n. sp. (Plate XII. figs. 164-lCG.) 



Female, length ^", breadth x^". 



External Characters. — Body tapering slightly forwards, but considerably behind, 

 where it terminates in a rather long pointed extremity, with a rounded sucker and three 

 small divergent setae. Head rounded, narrowed, provided with four crucially arranged 

 papiUse, and behind them a circlet of 8-10 long patent setae ; a few small setae scattered 

 over anterior part of body also. Integument with almost imperceptible transverse striae, 

 about 3-0000" apart, and with an appearance of longitudinal markings also at a dis- 

 tance of swo"- 



Pharynx indistinct. Teeth three, equal-sized, of a light fawn-colour, rooo" long, 

 marked with minute longitudinal lines, and having their upper extremities somewhat 

 bilobed. Q^sojjhagus about |th of total length, having its canal indicated by a sinuous 

 line, with irregular transverse markings of its walls at intervals, and a more or less 

 abundant arrangement of minute olive-coloured pigment-granules, mostly collected in 

 three longitudinal lines, with short irregular transverse offshoots or separate masses, 

 most marked anteriorly just behind |)harynx. Intestine thickly covered with dark- 

 coloxired fat-particles contained in rather large cells, the tessellated appearance beiiiP' 



