350 
Entozoa of Fishes 
Sub-family XI. ILemiurinae (Liihe 1901) Looss 1907. 
Genus i. Hemiurus (Rud. 1819) Looss 1907. 
Species 1. Hemiurus communis Odhner 1901. 
This species was found in the stomach of six different fishes, namely, 
Labrus berggylta, Gcidus callarias, Gadus minutus, Gcidus pollachius, 
Gadus virens and Drepanopsetta plcitessoides. With the exception of the 
cod these are all new British hosts. It is now known to occur in 17 
British fishes but that number will be largel}' added to. Like Derogenes 
various it is essentially a parasite of Gadoid fishes, but to a more marked 
degree. It also occurs in somewhat larger numbers than that species. 
It has been described by Odhner (1904, p. 351), Lebour (1908, pp. 
50—57) and myself (1907, pp. 86—88 and 1909 6, pp. 20—21). 
Species 2. Hemiurus lilhei Odhner 1904. 
This species was found only in the herring ( Glupea harengus ) to the 
extent of 25 %• It is described by Odhner (1904, p. 352), Looss (1908, 
p. 105) and myself (1907, pp. 85—95 and 1909 6, 21—22). 
Sub-order GASTEROSTOMATA Odhner 1904. 
Genus i. Prosorliynchus Odhner 1904. 
Species 1 . Prosorliynchus aculeatus Odhner 1904. 
This species is a frequent parasite of the intestine of the conger and 
has been met with by several observers. It was confused with Proso- 
rhynchus crucibidum (Rud.) and it was only first recognised as distinct 
from that species by Odhner. It occurs in moderate numbers and is 
apparently confined to the conger. 
Except in young specimens it possesses a distinct yellowish-brown 
colour. The body is thick, but slightly flattened dorso-ventrally; of 
almost elliptical shape but pointed towards each end. The cuticle is 
entirely covered with regular scale-like spines. 
The length of mature specimens is 1—2'5 mm, Egg-production 
begins at a length a little over 1 mm. The maximum breadth is at the 
middle of the body and is about half the length. The dimensions of an 
average full-grown specimen are 2 x 0'95 mm. At the anterior end the 
