298 Part III. — Twentieth Annual Bejwrt 



Fain. Lern^id^. 

 Genus Haimohaphes, Steenstrup and Lutken (1861). 



Hmmohaphes ambiguus, T. Scott. 



1900. Hihinohaphes ambiguus, T. Scott, 19th Ann. Rept. of 

 the Fishery Board for Scotland, pt. iii., p. 162; pi. vii., 

 fig. 15. 



Specimens of this curious Lernfean were obtained on Spotted Dragonets, 

 Callionymus rnaculatus, Bonap., captured in the Firth of Clyde on 

 October 4th, 1901. This is an addition to the Clyde crustacean fauna, 

 and an extension of the distribution of the species (see also a further 

 reference to this species under the record of Ghondracanthus ornatus). 



HcBmohaphes cyclopterina (Fabr.). 



A specimen of this parasite was obtained on the gills of a Butterfish, 

 Pholis gunnellus, L., captured in the Forth estuary during the preceding 

 summer. This appears to be an addition to the number of the hosts of 

 Htemohaphes cyclo'pterina. 



The following are the names of the fishes mentioned by Steenstrup and 

 Lutken in their work on Parasite Copepoda (p. 65) as hosts for this 

 Hiemohaphes : — 



Gottus gronlandicus, Gottus buhalis, Gottus scorpius, Cyclopterus 

 spinosus, Gadus merlangus, Gentronotus fasciatus, and Sebasfes nor- 

 vegicus. To this list have been added the Pholis gunellus mentioned above, 

 and Agonu cataphradus, also captured in the Forth, and on which 

 ffcemobaphes cyclopterina was obtained some years ago. 



Fam. Chondracanthid^. 

 Genus Ghondracanthus, De la Roche (1811). 



Ghondracanthus ornatus, T. Scott. PI. XIII., fig. 34. 



Further specimens of this species have been obtained on the gills of 

 some Spotted Dragonets captured in the Clyde on October 4th, 1901, 

 both males and females were obtained on these Dragonets, and I am now 

 able to give a full-size figure of a male specimen, prepared by my son. 

 The specimen scarcely reaches half a millimetre in length, and is 

 moderately robust, as shown by the drawing (fig, 34). 



A number of specimens of Hcemofjaphes ambiguus, T. Scott, were ob- 

 tained on the gills of the same sample of Spotted Dragonets, and as both 

 species were sometimes found on the gills of the same fish, the following 

 notes on the relative frequency of the two forms may be of interest. 



Fifty-five fishes were contained in the sample collected on the 4th of 

 October, and on the gills of these, fifteen specimens of Hcemohaphes 

 ambiguus and eight of Ghondracanthus ornatus were obtained ; usually 

 the specimens of the two species occurred singly and on diiferent fishes, 

 but in several instances two specimens of the same species, or a specimen 

 belonging to each species, occurred on the gills of a single fish ; for 

 example, a Spotted Dragonet seventy- three millimetres in length had a 

 Ghondracanthus on one side and a Hiemobaphes on the other ; another 

 Spotted Dragonet had a Ghondracanthus and a Hcnmobaphes on 

 the same side. Another fish one hundred and four millimetres in length 

 had two Ghondracanthus ornatus on the same side, while the other side 

 was free of parasites ; a fourth specimen of Spotted Dragonet eighty-six 



