494 



BULLETIN" 15 8, UNITED STATES NATIONAL MUSEUM 



Female. — Head spherical, one-third the length of the trunk ; basal 

 segment of abdomen four times as long as anal segment ; caudal rami 

 a little longer than the anal segment and curved like parentheses; 

 ovisacs half as long again as the entire body. First antennae 3-seg- 

 mented ; second antenna 2-segmented, the distal segment with a stout 

 apical claw; maxillae also tipped with claws. Total length, 2 mm. 

 Egg strings, 3 mm. long. 



Male. — Cephalic segment considerably swollen and half the entire 

 length, the rest of the body divided into five segments of about equal 

 length, the thorax passing insensibly into the abdomen. The caudal 

 rami are longer than the anal segment, slender, and setiform; the 

 maxillipeds are made up of three segments and a slender apical claw. 

 Total length, 0.5 mm. 



Figure 296. — a, Blias prionoti, lemale, with male, lateral (after Kr0yer) ; 

 b, Oralien triglae, female, dorsal ; c, 0. triglae, male, lateral 



Remarks. — Kr0yer's original description from a specimen found 

 on the gills of a Prionotus (sea robin) in the Vienna Museum is the 

 only one that has ever appeared. That fish came from the coast of 

 Brazil, and hence this is the first record of the parasite on North 

 American shores. 



Genus ORALIEN Bassett-Smith, 1899 



Female. — Head swollen and bulblike anteriorly, where it is armed 

 with two pairs of antennae, narrowed and elongated posteriorly into 

 a cephalic neck, which is slightly enlarged where it joins the thorax, 

 and carries there the mouth and mouth parts. Thorax fused, en- 

 larged laterally and more or less depressed ; divided by a transverse 

 constriction into two portions, the anterior of which carries two 

 pairs of leg rudiments, the posterior a pair of lobes at the distal 

 corners. Abdomen small, 1-segmented; caudal rami lacking. 



