NO. 2063. ArORTII AMERICAN PARASITIC COPEPODS— WILSON. 693 



new genus, which resembles Clavella in general characters, but 

 differs in many details. 



CLAVELLISA, new- genus. 



Generic characters of female. — Cephalothorax much longer than the 

 trunk, slender and often wrinkled, attached to the center of the 

 dorsal surface of the trunk; head distinctly separated from the neck, 

 slightly enlarged and covered vdih a doreal carapace; trunk wider 

 than long, somewhat flattened dorso-ventrally, and destitute of 

 abdomen, anal laminae, genital, or posterior processes; egg strings 

 short and Avide, sometimes at an angle with the body. 



First antennae exceptionally large and heavily armed, the spines 

 often flattened hke a knife blade and projecting far in front of the 

 head. Second antennae biramose, the two rami at right angles 

 to the basal portion and turned across the frontal margin. First 

 maxillae usually bipartite, the palp with a single seta; second maxillae 

 short and laminate ; maxillipeds of the usual pattern. 



Generic characters of male. — General form ovoid, the anterior por- 

 tion covered with a carapace; body folded upon itself and thoroughly 

 fused without any distinction of parts or segmentation; mouth tube, 

 appendages, and genital process on the ventral surface at different 

 angles with the body axis, and not crowded together, as in Clavellodes. 

 First antennae three-jointed, basal joint much larger than the others; 

 second antennae biramose, the rami cylindrical and unjointed; first 

 maxillae tripartite; second maxillae and maxilHpeds long and armed 

 with strong claws; genital opening at the tip of a prominent knob 

 behind the second maxillae. 



Type. — Clavellisa spinosa, new species. 

 ( Glavellisa, Clavella and 'hoc, similar in appearance.) 

 Eemarlcs. — This is another new genus and includes two new species 

 and three that have been heretofore included in the genus Anchorella. 

 The first and most noticeable peculiarity of the genus is the attach- 

 ment of the cephalothorax to the dorsal surface of the trunk, at 

 about its center. Apparently it has no connection whatever with 

 the second maxillae; in other words the second maxillae have 

 migrated backward the whole length of the neck, and have then 

 moved along the outer surface of the trunk until they are some 

 distance away from the base of the neck. 



Then the first antennae are much enlarged, have become rioid, 

 and project straight forward, being armed, at least in one species, 

 with large and mcked spines, totally unlike anything known in the 

 entire family of Lernaeopodidae. In the male wliile there has been 

 a folding and complete fusion of the body, it has not been carried 

 as far as in Olavella and Clavellodes. The posterior portion of the 



