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PROCEEDINGS OF THE NATIONAL MUSEUM 



second appendages on ventral side with a narrow cliitinoiis strip, 

 which projects posteriorly beyond the edge of the appendage (fig. 

 33, c) . Coxa extremely broad with a broad, flat lobe along the whole 

 posterior side, which has a machete-shaped lobe on the distal part 

 of the appendage projecting ventrally from the posterior lobe so 

 that it stands out from the appendage. The third appendages have 

 the combined basal segments telescoped. Posteriorly there is a chi- 

 tinous lamina projecting toward the body similar to the narrower one 

 on the anterior appendage; it is about three times as broad as the 

 latter. The remainder of the segments form a saddle over the fourth 

 appendage by means of a ventral lobe on the distal end of the coxa 

 and a dorsal lobe proximal to it. The exopod is broad at the base 



PiGDBB 33. — Argulus laticauda: a. Respiratory areas ; b, ribs of suction cups ; o, accessory 

 organs on last tliree legs of male. 



with a large hump anteriorly which fits under the lobe of the 

 anterior appendage. The fourth appendage also has short basal 

 segments. Anteriorly the broad peg occupies more than half the 

 space. It is projected out as a large papilla tipped on the distal 

 edge by two chitinous cylindrical tips which extend down the side 

 of the papilla. The posterior edge of the basis is expanded into a 

 hatchet-shaped projection, while the coxa has a roughly boot-shaped 

 one. The exopod is expanded slightly at the base. 



This species has been collected in tows at Vineyard Sound, Mass. ; 

 on Anguilla rostrata^ Pseudopleuronectes americanus, Paralichthys 

 dentatus^ Microgadus tomcod^ Myoxocephalus scorpms, Opsanus tau^ 



