100 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.53. 



Remar/iS. — This species is considerably smaller than cyclopterina^ 

 and may be recognized at once by the single pair of bifid processes on 

 the cephalothorax, while the second, third, and fourth thorax seg- 

 ments are destitute of processes. This distinction may then be sub- 

 stantiated by the differences in the appendages, especially the max- 

 illae and the swimming legs. 



The head of this species was much better preserved than those of 

 cydopterina, and the details of all the appendages are distinctly 

 fchown. The long plumose setae upon the swimming legs are espe- 

 cially worthy of notice. Being buried inside the bulbus arteriosus of 

 the host they have no chance to get broken or injured, and thus are 

 preserved intact, as they were when the copepodid female first found 

 her host. 



The fact that the only head amongst the 15 females belonging to 

 the s])ecies cyclopterina was mutilated, while in the single specimen 

 of the species enodis both the cephalothorax and the free thorax 

 were so covered with cauliflower processes as to effectively hide the 

 swimming legs, makes it advisable to take the present species as our 

 standard in the matter of the number and arrangement of the swim- 

 ming legs. 



Accordingly the genus diagnosis given above (p. 94) assigns four 

 pairs of swimming legs to the genus, and there is every reason to be- 

 lieve that this will prove to be the correct number when more speci- 

 mens of the other two species are obtained. 



Genus HAEMOBAPHOIDES T. and A. Scott. 



Haanobaphoidcs T. and A- Scott, British Parasitic Copepoda, Ray Society, 1913, 



p. 148, pi. 44, fig. 8. 



External generic characters of female. — Cephalothorax subspheri- 

 cal and furnished with terminal branched chitin horns similar to 

 those found in Lernaea; second, third, and fourth thorax segments 

 not differentiated, but fused into a short neck, which is straight and 

 not reflexed, and which carries neither horns nor processes. Trunk 

 much swollen, bent into a sigmoid curve, with a pair of simple 

 processes over the bases of the egg strings; abdomen longer than the 

 genital segment, covered with irregular processes along the sides and 

 on the dorsal surface at the base, and considerably enlarged at the 

 tip. Egg strings coiled into a tight spiral which tapers toward the 

 distal end. No details with reference to any of the appendages nor 

 to the internal anatomy. 



Genus habitat. — This genus bores into the gill arches of fish and 

 snchors itself in the surrounding tissues by means of its chitin horns. 

 It does not bury its head in the aorta or the bulbus arteriosus like 

 the preceding genus. 



