PARASITIC CRUSTACEA FROM BIMINI— PEARSE 349 



are present toward the median line from the hook. The fourth leg 

 bears five terminal spines. Fifth leg represented by two short 

 spines at the posterior end of the genital segment. 



Measurements: Body length 1.7 by 2.6 mm.; genital segment 

 0.5 by 0.4 mm. 



Male. — Unknown. 



Type.—V.S.'NM. No. 88569. 



Host. — A single female was taken from a gill of a finned 

 albacore, Germo alalunga (Gmelin). 



Remarks. — This species differs from all the others in the genus 

 in having feebly developed lunules, in the size and the distribution 

 of the spines on the second antennae and maxillae, the character 

 of the f urcula, the presence of a characteristic f urculalike support 

 between the bases of the third legs, and a sucker on each side of 

 this armed with five stout spines. 



Genus LERNANTHROPUS Blainville 



LERNANTHROPUS AMPLITERGUM, new species 



Figures 69, e-g; 70, a; 71 



Female. — Body robust ; dorsal plate slightly wider than regions 

 anterior to it. Cephalothorax covered by a plate that is indented 

 posteriorly and has a wide median projection anteriorly. In more 

 mature individuals the posterior indentation is deeper and the 

 sides are straighter (fig. 69, g) , because they are turned ventrally. 

 Second thoracic segment is almost as wide as the cephalothorax, 

 with curved lateral margins. Third segment longer than second, 

 wider posteriorly. Fourth segment about half as wide as third 

 where the fourth legs are attached but bearing rounded conical 

 lateral projections anteriorly. Genital segment less than one-third 

 as wide as third segment. Caudal rami reach near the posterior 

 end of the dorsal plate; slender, cylindrical. Fourth legs extend 

 one-third their length beyond dorsal plate, which is wide and often 

 indented in the midline posteriorly. Egg strings extend half or 

 more of their length beyond dorsal plate; contain 42-42, 33-39, 

 64-71 eggs. 



First antennae concealed beneath front and not visible in any 

 specimen. Second antenna with a sharply curved terminal hook, 

 which has a stout short spine near its base. Mouth tube conical 

 with a wide base. First maxilla with 2 short terminal setae. Sec- 

 ond maxilla with a terminal hook that is spinulose on the inside 

 of its curve and is preceded by a stout spine. Maxillipeds stout, 

 with terminal hook slightly curved. 



