1899.] PAEASITIC COPEPOPA OK FISHES. 441 



In the family Lernseidse, I have united the two genera Lernce- 

 enicus and Lernceonema under the older name, following the views 

 set forth in the able paper by liichiardi in 1876. Five genera of 

 this family are represented by single spedes. 



In the family Chondracanthids (p. 488), the older name of 

 Sphyrion has been retained for Kroyer's Lesteira. Two species are 

 given, specimens of both being now in the British Museum — one, 

 the larger (by far the largest of all these Copepod parasites), is 

 from 'New Zealand, and is probably of the same species as that 

 obtained by Guerin off the Cape of Good Hope, having few lobed 

 processes on the float-like head. The second was taken off 

 Dungeness ; it is much smaller, with a greater number of lobe-lika 

 processes, and is described as S. lumin Kr. 



The position of the long known Chondracanthus triglce has 

 been for many years a disputed point. Linnaeus placed it with 

 the Lernaeas ; Blainville described it as a Lementoma, Milne- 

 Edwards as a Ohondracanilms, Heller thought it probably a species 

 of Medesicate, and J. 8teeustrup placed it between Lesteira and 

 Medcsicate. The animal differs from every other, except Thero- 

 damus, in having the anterior part of the head with the hook-like 

 posterior antennte separated by a long neck-like process from the 

 mouth, which is placed at the juncture of this with the thoracic 

 portion — a peculiarity pointed out by Milne-Edwards and others, 

 differing thus from Medesicate and Chondracanthus ; I have there- 

 fore placed it in a genus of its own — Oralien. 



In the family LernEeopodidse, as I have pointed out before, 

 it is impossible to differentiate the genus BrachicUa from Anchorella 

 by the female alone, the union, complete or otherwise, of the 

 second pair of maxillipeds not being characteristic, though the 

 males are quite distinct, and should be always looked for and 

 recorded. Many of the AnchoreUce are very superficially described, 

 and are very indefinite. The genus Thysanote has been made to 

 embrace a number of peculiar forms which have been placed with 

 Bracliiella. 



The genus Cestopoda of Kurz has been added. While in India 

 I obtained on two occasions specimens of this peculiar genus 

 from different fishes ; these have not yet been described. I have 

 provisionally placed here the Naohranchia cygniformis of Hesse, 

 but it is insufficiently described. 



Family I. EEG-ASILID^. 



Cephalothorax pyriform or flattened, first segment the largest ; 

 nearly or wholly provided with limbs. Anterior antenna of 

 moderate length, 5- or 6-jointed, alike in both sexes. Posterior 

 antennae with 3 or 4 joints. Second maxillipeds in the form of 

 hooks, generally 3-jointed. Eifth pair of thoracic limbs one- 

 branched or sometimes rudimentary. Eye median, with two 

 lenses. Sex-organs paired. Female with two egg-sacs. Toung 

 as a free-swimming larva. Male smaller than female and less 

 freely locomotive. 



