566 NEW SPECIES OF PARASITIC COPEPODS. 



The first maxillipeds consist of tliree joints, the basal relatively large, 

 long, simple, with a moderately convex anterior and a nearly straiglit 

 posterior margin; the second, slender, a little more than half as long 

 as the basal ; the terminal very small, slightly curved, tapering, and 

 pointed. A row of minute spines begins upon the posterior margin of 

 the second joint lunir the outer end and continues over upon the distal 

 joint. The second maxillipeds consist of two distinct joints, the basal 

 very large and broad, the terminal slender, and partly divided trans- 

 versely near the outer end. The anterior margin of the basal joint is 

 very strongly convex, the posterior nearly straight, the inner end ab- 

 ruptly constricted. The second joint is sonu^what more than half as 

 long as the basal, moderately broiul at the inner end and gradually ta- 

 pering to an acute point, the outer portion being strongly curved. In 

 the figure of this appendage (Fig. 4, PI. XXXIl) the width of the basal 

 joint is slightly exaggerated through compression. 



The thoracic feet of the first pair are situated only a short distance 

 back of the maxillipeds, and consist of a small, elongate, rectangular 

 basal process aud three appendages. The outer appendage is the 

 largest and is attached to the anterior edge of the basal ])rocess nearthe 

 outer end. It is irregularly subovate or oblong in outline, the distal 

 end broad, slightly curved, and armed with five stout, acute spines, of 

 which the innermost one is larger than the others ami is slightly curved 

 at the tip. The median appendage is attached just within the middle 

 of the basal process, is much smaller than the other one, stout, fusi- 

 form in shape, with an elongate terminal spine. The innermost ap- 

 pendage is very minute, circular, with two slight projections from the 

 outer end. The feet of the second pair are much smaller than those of 

 the first, being minute and situated some distance back of the latter, 

 and near the sides of the body, where they may be readily overlooked. 

 They consist of a basal lobe-like process, with two irregular lobes at- 

 tached to the posterior margin, and a third process at the outer end, 

 similar to the corresponding one of the first pair, but much smaller 

 and with only three marginal spines. Just outside of these processes 

 is a minute, slender, pointed seta, arising directly from the ventral sur- 

 face. 



The entire body is very soft, and all parts except the thickened thorax 

 are very translucent, almost transparent, so that underlying append- 

 ages can generally be made out through them. Evftiu the appendages 

 of the cephalothorax can be partly distinguished from the dorsal side 

 by strong transmitted light. The color of living specimens is a bright 

 red, due to the large quantity of blood diffused through the entire body, 

 aud making it difiicult to detect them when attached to the gills, except 

 by means of the egg-tubes, which are dark brown. The actual color of 

 the body appears to be light yellowish. Specimens have been kept 

 alive several days in dishes of sea- water, the red color gradually fading 

 out. The posterior antenu;D, maxillipeds, basal i>rocesses of the first 



