90 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 53. 



horn, chitinous; neck cylindrical, heavily chitinized, and showing 

 considerable torsion, attached to the trunk on the midline. Trunk 

 bent in a sigmoid curve, also heavily chitinized; abdomen large, with 

 rudimentary anal laminae, armed with a double row of dichotomously 

 branched processes; egg strings coiled in a loose mass like those of 

 Lernaea and concealed by the processes. 



Two pairs of antennae, second pair chelate; proboscis somewhat 

 protractile; mouth parts replaced by small knobs; first two pairs of 

 swimming legs biramose, third and fourth pairs uniramose, all the 

 rami two-jointed and setiferous; the four pairs close together behind 

 the head. 



Internal generic characters of female. — Bilateral symmetry com- 

 plete; stomach without lobes; intestine wide and much convoluted 

 in the neck, greatly enlarged in the trunk, then narrowed in the 

 abdomen; rectum short; ovaries extending from the bend some dis- 

 tance forward into the neck, nearly as long as the oviducts, strongly 

 flattened posteriorly, but nearly cylindrical anteriorly ; oviducts very 

 wide, somewhat flattened laterally, and at the sides of the intestine 

 rather than ventral to it ; in fact the ovary and oviduct almost come 

 together and completely cover the lateral surface of the intestine. 

 Cement glands between and ventral to the oviducts, glandular por- 

 tion much longer than the duct, curved dorsally at the interior end 

 around the outside of the oviduct, or sometimes passing up inside 

 of the oviduct and curving over the top and down on the outside; 

 duct of cement gland convoluted. Chitin layer of body wall much 

 thickened and very hard; chitinogen layer thickest along the sides 

 of the body and in the abdomen; no definite skin-glands. 



Genus habitat. — This genus burrows into the underlying tissues 

 from various places in the mouth and throat of their fish host, on 

 the jaw, the roof of the mouth, gill arches, etc. The entire body is 

 strongly chitinized and shows both torsion and flexion. 



Type of the genus. — Lemaeolophus sultanus (Nordmann), mono- 

 typic. 



{Lemaeolophus, Lernaea and X6(/>os, a crest or tuft.) 



KET TO THE SPECIES. 



1. Body Straight or only slightly curved ; a distinct groove at the base of the 

 neck ; abdominal processes 20 or more on either side and iinbranched ; 

 (27 mm.)* striatits Wilson, 1912. 



1. Body folded back upon Itself once at the base of the neck ; abdominal proc- 

 esses 10 or more on either side, very slender and profusely branched ; 

 (20 mm.) recurvns Wilson, 1912. 



1. Body with a regular sigmoid curve 2 



2. Abdominal processes 20 or more on either side, divided into numerous fine 



hairs at the tips (16 mm.) hemiramphi (Kr0yer), 1863. 



2. Abdominal processes 10 or more on either side, dichotomously branched from 

 the very base (15 mm.) sultanus (Nordmann), 1864, p. 91. 



1 Average total length of species. 



