138 MR. H. CHARLTON BASTIAN'S MONOGRAPH 



uniform in size, embraced by a I'ing near its middle, having three longitudinal lines of 

 pigment more or less distinct, and two distinct local aggregations immediately behind 

 pharynx (jjseiidocelli), varying in colour from brown to carmine. Intestine covered with 

 hepatic particles having a tessellated arrangement. Anus ^-g" from posterior extremity ; 

 posterior boundary of anal cleft rather prominent. Vulva prominent, some distance be- 

 hind middle of body. Uterus unsymmetrical. Floating gland-cells numerous, large, 

 about 30^00 " ill diameter. Excretory ventral duct opening far forwards, only 4^" from 

 anterior extremity, by a very narrow portion immediately following a small pyriform 

 dilatation. Lateral canals of a green colour and granular, with the appearance of an axial 

 channel. 



Hale, length -j^", breadth ygo'- 



Posterior extremity curved, shorter, more abruptly narrowed, and having two median 

 setjE immediately above anal cleft. (Esophagus about |^th of total length. Anus -^^" 

 from posterior extremity. Spicules almost straight, slender, g^" long ; accessory piece 

 wanting. 



Sab. Pound, with Chromadora vulgaris, C. filiformis, and Cyatholaimus ocellatus, on a 

 stunted and dingy specimen of Cladophora rupestris from half-tide pool, Falmouth. 



The specimens found by myself seem to agree so closely with the short description Du- 

 jardin has left us of his Oncholaimus attenuatus, as to make me think they must belong to 

 the same species. The principal difference is that he mentions a "serie de soies roides" 

 above the anus in the male, whilst I have only recognized a single pair in this situation. 

 His description is as follows : — " Corps filiforme, tres-mince, cinquante fois aussi long 

 que large ; tete munie lateralement de deux ou quatre soies courtes ; cavity buccale 

 along^e, arm^e de trois pifeces longitudinales, etroites, portant chacune une forte dent au 

 milieu ; deux taclies rouges contigu^es prfes du pharynx ; cesophage long de O"""^, large de 



Omm.025." 



" 31dle, long de 2°™'4, large de 0"""*045 ; queue brusquement r^tr^cie en arrifere de 

 I'anus, recourbee en crochet et termin^e par une sorte de papille (ou ventouse ?) ; anus 

 a O^^'OSS de I'extr^mite, accompagn^ d'une double sdrie de soies roides ; spicules longs 

 de 0™"-03." 



" Dans I'eau de mer, entre les algues, h Lorient." (Hist. Nat. des Helminth, p. 236.) 



8. O. PAPiLLOSus, Eberth. 



Untersuch. iiber Nemat. p. 26, tab. i. figs. 13-17- 



" Korper gestrickt, das Vorderende wenig verschmalert, quer abgestutzt. Das Hinter- 

 ende des Weibchens gerade, in eine lauge Spitze ausgezogen. Bei dem Mannchen 

 macht das Hintertheil eine leichte Krummung gegen den Rllcken, biegt sich aber dann 

 mit der aussersten Spitze wieder gegen den Bauch. 



" Lange des Weibchens 3 Mm., Breite 0-075. 



" Oesophagus=ein Viertel der Korperlange." 



9. O. MEGASTOMA, Eberth. 



Untersuch. iiber Nemat. p. 26, tab. i. figs. 18-20. 



" Korper fast gerade, fadenformig, gegen dcu Vorderleib wenig verschmalert Mund- 



