358 Mr. P. W. Bassett-Smitli on 



(Caligus longipedfs, sp. n.) ; on the tongue of Caranx djedaba 

 was frequent]}- found an ulcerated patch of mucous membrane 

 covered by a small variety? of C. tenax ; on the roof of the 

 mouth of another species {Caranx ferdau) were seen the 

 tumours produced by Caligodes carangis, sp. n., and once I 

 found the chitinous head and neck of a Lemma deeply buried 

 in the roof of the mouth, the body having rotted away. 



In contradistinction to these stand out the fish of the family 

 Sparidae, which have strong crushing-teeth in the jaws; I 

 very rarely found any parasites in these fish, the different cha- 

 racter of the food, perhaps, causing the peculiarity. 



The sharks have many parasites, as described by Kioyer, 

 Steenstrup and Liitken, M.- Edwards, Leach, Van Beneden, 

 Heller, &c. ; but, though there are plenty of these fish in the 

 waters round Aden, it was rarely one saw them before the 

 surface had become too dry &c. A female specimen of 

 Ahbion carchart'cBj however, was found. 



The genus Lernanthropus appeared frequently, the regular 

 flushing and pallor of the laminate processes representing the 

 third and fourth thoracic feet at every vascular contraction 

 make it evident that they act as branchiae, as Hesse pointed 

 out in his elaborately illustrated paper in ' Revue des 

 Sciences Naturelles,' tome vii. (June 1878). 



Ergasilidae. 



BOMOLOCHUS, Nordm. 



Bomolochus megaceros, Hell. (PI. X. fig. 1.) 



As the male of this species has not been recorded, nor has 

 one of any other species of this genus, so far as I have been 

 able to find in published works, been obtained, it seems worthy 

 of placing here on note, especially as though I have examined 

 a large number of the female Bomolochus, both living and 

 dead, yet only once was a male discovered. The minute size 

 renders them undoubtedly very difficult to see, and it is only 

 a\ hen attached to the female, as occurred in this case, that they 

 are likely to be found. The peculiar elegance of the anterior 

 antenna 1 , and the large hooked maxilliped with which it 

 firmly attaches itself, were remarkable, being very unlike 

 those of the female, of a much less degraded type. The 

 drawing was made very quickly after capture, but in preparing 

 the specimen for a permanent preparation it was unfortu- 

 nately spoilt ; therefore there are many points which require 

 further elucidation. The female Bomolochus megaceros I 

 have taken from Stromateus niger, Bombay, Colombo, and 



