138 MR. H. CHARLTON BASTIAN’S MONOGRAPH 
uniform in size, embraced by a ring near its middle, having three longitudinal lines of 
pigment more or less distinct, and two distinct local aggregations immediately behind 
pharynx (pseudocelli), varying in colour from brown to amine. Intestine covered with 
hepatic particles having a tessellated arrangement. Anus 335 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 3565 in diameter, Exeretory ventral duct opening far forwards, only zh” from 
anterior extremity, by a very narrow portion immediately following a small pyriform 
dilatation. Zateral canals of a green colour and granular, with the appearance of an axial 
channel, 
Male, length 45", breadth 415". 
Posterior extremity curved, shorter, more abruptly narrowed, and having two median 
setzte immediately above anal cleft. Gisophagus about 1th of total length. Anus ug 
from posterior extremity. Spicules almost straight, slender, 41," long; accessory piece 
wanting. 
Hab. Found, 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 “ série 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, très-mince, cinquante fois aussi long 
que large; téte munie latéralement de deux ou quatre soies courtes; cavité buccale 
alongée, armée de trois pièces longitudinales, étroites, portant chacune une forte dent au 
milieu ; deux taches rouges contiguées près du pharynx ; œsophage long de 0™™4, large de 
0mm-025. 
“ Mile, long de 2""-4, large de 0™™-045 : queue brusquement rétrécie en arrière de 
l'anus, recourbée en crochet et terminée par une sorte de papille (ou ventouse ?) ; anus 
à 077-033 de l'extrémité, accompagné d'une double série de soies roides; spicules longs 
de 09-03." 
“ Dans l'eau de mer, entre les algues, à Lorient." (Hist. Nat. des Helminth. p. 236.) 
8. O. PAPILLOSUS, Eberth. 
Untersuch. über Nemat. p. 26, tab. i. figs. 13-17. 
“ Körper gestrickt, das Vorderende wenig verschmälert, quer abgestutzt. Das Hinter- 
ende des Weibchens gerade, in eine lange Spitze ausgezogen. Bei dem Männchen 
macht das Hintertheil eine leichte Krümmung gegen den Rücken, biegt sich aber dann 
mit der äussersten Spitze wieder gegen den Bauch. 
“ Länge des Weibchens 3 Mm., Breite 0-075. 
“ Oesophagus=ein Viertel der Körperlänge.” 
9. O. MEGASToMA, Eberth. 
Untersuch. über Nemat. p- 26, tab. i. figs. 18-20, 
3 “ Körper fast gerade, fadenförmig, gegen den Vorderleib wenig verschmälert Mund- 
