H/EMOBAPHOIDES AMB1GUUS. 149 



short and stout. Neck very short or nearly obsolete, 

 genital segment flexuous ; the anterior portion swollen 

 as in Hsemobaphes, 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 1 regular 

 convoluted spires as in Haemobaphes. Colour reddish- 

 brown. Length about 11*5 mm. 



Habitat. — Parasitic on the gills of spotted dragonets, 

 Gallionymus maculaius Bonap. On spotted dragonets 

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



In a sample of fifty-five Gallionymus maculatus captured 

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

 Haemobaphoides ambiguus and eight of Chondr acanthus orhatus 

 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 Chondr acanthus on one side 

 and a Hsemobaphoides on the other ; another dragonet liad a 

 Chondr acanthus and a Hzemobaphoides on the same side; a 

 third had two Chondr acanthus on the same side, while the 

 other side was free of parasites j and a fourth had a H&mo- 

 baphoides on each side but no Chondr acanthus. It was also 

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

 I ri'ijuently on the right side — the fish Testing on its ventral 

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

 noticed that though seventeen specimens of the common 

 dragonet (Callionyinup lyra) captured at the same time and 

 place were examined, no parasites were observed on them. 



Genus 30. PENNELLA Olcen, 1815. 



Female. — Body greatly elongated and slender. 

 Head tolerably large, globose or nearly so, studded 

 with minute tubercles and usually provided with horn- 



