WILSON, PARASITIC COPEPODS FROM JAPAN. 9 



at Sato-no-misaki, Kiuschiu, Japan. They are made the 

 types of the new species. The second lot consists of a 

 single female with an attached male and was taken from an 

 unknown höst, captured May 14, 1914, twenty-three miles 

 N. W. of Osesaki, one of the Goto Islands. 



Specific characters of female. General body form short 

 and stout; head large, three-fifths as wide as the body, or- 

 bicular, with two pairs of horns on the lateral margins, the 

 anterior pair considerably shorter and narrower than the 

 posterior ones. The entire body is fused, with the joints 

 indicated by indentations on the lateral margins and by 

 breaks in the longitudinal muscles. The anterior thorax is 

 narrowed into a short neck behind the head with a single 

 pair of soft lateral processes and a short, bluntly rounded 

 horn on the dorsal surface on either side close to the lateral 

 margin. The rest of the thorax has a row of soft processes 

 along either lateral margin and around the posterior end. 

 These are long and narrow and taper to a blunt point. The 

 pair at the posterior corners are composite, made up of 

 three rami, the central one of which is bifurcate. In the 

 center of the posterior margin is a single, unpaired process, 

 wider than the others and more acuminate. 



The fused genital segment and abdomen are partially 

 differentiated and project from the ventral surface of the 

 thorax at its posterior end. They carry a single pair of 

 similar soft processes. 



The first antennae are of the usual form, soft, indistinctly 

 segmented, enlarged at the base, and tapered to a rather blunt 

 tip which is armed with a single tiny seta. The second anten- 

 nae are in the form of stout chitin claws, considerably flat- 

 tened dorsoventrally and bluntly pointed, with a pair of 

 minute spines on the inner margin at the tip. 



The mandible has the usual crescent-shaped cutting 

 blade, armed with small needle-like teeth along both margins. 

 The palp is very large and is attached to the posterior distal 

 corner of the basal joint behind the cutting blade. It is 

 composed of a single joint, acorn-shaped, the point of the 

 acorn tipped with a single large spine. The maxilla has a 

 narrow and somewhat curved cutting blade and a small 

 conical palp, tipped with a single seta. The blade terminates 



