W. Nicoll 
341 
The length of my specimens is about 1 mm., the breadth 015 mm. 
The suckers are approximately equal with a diameter of 012 mm. the 
oral being if anything larger than the ventral. The latter is situated 
036 mm. from the anterior end. The cephalic spines are in two rows 
of 18 each and each row forms a complete uninterrupted circle. The 
spines are comparatively stout. 
Sub-family III. Lepocreadiinae Odhner 1904. 
Genus i. Lepidapedon Stafford 1904 = Lepodora Odhner 1904. 
Species 1 . Lepidapedon rachiaeuvi (Cobbold 1858). 
This species was found in considerable numbers in the intestine, 
usually towards the anterior end, of Gadus pollachius (55 °/ 0 ) and Gadus 
virens (45 °/ 0 ). Odhner has recorded it from Gymnocanthus ventralis, 
but in British waters it appears to be confined to the Gadidae and in 
particular to the two above-mentioned species together with Gadus 
aeglefinus. In Gadus callarias its place is taken by Lepidapedon 
elongatum (Lebour) and in Gadus merlangus by Pharyngora bacillaris 
(Molin). It has been fully described by Odhner (1904, pp. 332—7), 
Lebour (1908, pp. 59—60) and myself (1907, pp. 77—80). 
Genus ii. Pharyngora Lebour 1908. 
Species 1. Pharyngora bacillaris (Molin 1859). 
Synonyms. Distomum increscens Olsson 1868, pro parte. 
Pharyngora retractilis Lebour 1908. 
The species on which the definition of the genus Pharyngora was 
founded by Miss Lebour was regarded by her as distinct from Distomum 
bacillare Molin, but that the two are identical there can be little 
doubt. From an examination of some specimens from Gadus merlangus 
which Miss Lebour was good enough to send me I have been able to assure 
myself that they are the same as those which I have obtained in large 
numbers from Scomber scombrus at Millport and elsewhere. Molin’s 
original description (1859, p. 818), of the species is very incomplete, but 
it is accurate so far as it goes. It was redescribed and figured by 
Stossich (1887, p. 92, PI. X, fig. 38) but two of the most important 
characters were omitted, namely the external vesicula seminalis and the 
cuticular spines. This is not surprising for the species is of great delicacy 
Parasitology in 22 
