HSEMOBAPHOIDES AMB1GUUS. 149 



short and stout. Neck very short or nearly obsolete, 

 genital segment flexuous ; the anterior portion swollen 

 as in Hsemobaplies, but the distal portion narrow, and 

 prolonged so that it at least equals in length the 

 proximal part; this narrow elongated part also flat- 

 tened, and, at the extremity, abruptly expanded, the 

 margins somewhat irregular in outline and inflexed, 

 and the lateral lobes at its proximal end moderately 

 prominent. A distinct though quite shallow median 

 groove extending along the dorsum of the swollen half 

 of the genital segment. Egg-strings forming regular 

 convoluted spires as in Hsemobaphes. Colour reddish- 

 brown. Length about 11*5 mm. 



Habitat. Parasitic on the gills of spotted dragonets, 

 Callionymus maculatus Bonap. On spotted dragonets 

 captured in the Solway Firth and in the Firth of Clyde. 



In a sample of fifty-five Callionymus maculatus captured 

 in the Firth of Clyde in October 1901, fifteen specimens of 

 Hsemobaphoides ambiguus a,r\d eight of Chondracanthus ornatus 

 were obtained. In most instances the specimens of the two 

 species occurred singly and on different fishes, but in several 

 cases two specimens of the same species or a specimen of each 

 occurred on the gills of a single fish. For example, a spotted 

 dragonet 73 mm. in length had a Chondracanthus on one side 

 and a Hsemobaphoides on the other ; another dragonet had a 

 Chondracanthus &nd a Hsemobaphoides on the same side; a 

 third had two Chondracanthus on the same side, while the 

 other side was free of parasites; and a fourth had a Hsemo- 

 baphoides on each side but no ChondracantJius. It was also 

 noticed that when only one parasite occurred on a fish it was 

 frequently on the right side the fish resting 011 its ventral 

 surface and with its head toward the observer. It was further 

 noticed that though seventeen specimens of the common 

 dragonet (Callionymus lyra) captured at the same time and 

 place were examined, no parasites were observed on them. 



Genus 30. PENNELLA Okeu, 1815. 



Female. Body greatly elongated and slender. 

 Head tolerably large, globose or nearly so, studded 

 with minute tubercles and usually provided with horn- 



