COPEPODS OF THE "WOODS HOLE REGION 513 



Remanrhs. — The male is here described for the first time and 

 corresponds very closely with the males of other species of the 

 genus, thus confirming the transfer of this species from the genus 

 Lernaeopoda to Charopimis. This is the only copepod parasite thus 

 far found at the outer edge of a shark's spiracle in plain view from 



the outside. 



Genus CLAVELLA Oken, 1815 



Female. — Head distinctly separated from the trunk, elongated and 

 cylindrical, and standing at an angle with the axis of the trunk, 

 usually without a carapace. Trunk pear-shaped or ovoid, without 

 posterior processes, abdomen, or caudal rami, and with no traces 

 of segmentation, but an unpaired genital process is often present. 

 Two pairs of antennae and four pairs of mouth parts; second 

 maxillae entirely fused, sometimes so short as to be virtually 

 lacking, bulla spherical or knoblike; swimming legs obsolete. 



Male. — Head and trunk folded together ventrally and fused into 

 an unsegmented ovoid, in which there is no distinction of body 

 regions; no carapace or caudal rami. Two pairs of antennae and 

 four pairs of mouth parts; second maxillae and maxillipeds uncinate 

 and close to the mouth tube; all the appendages pointed diagonally 

 downward and forward. 



KEY TO THE SPECIES (FEMALES) 



1. Genital process present, one-fourth as long as trunk ; the latter 



as wide as long or wider uncinata (p. 513) 



Genital process lacking ; trunk much longer than wide, ellipsoidal 



and only elightly depressed 2 



2. Trunk twice as long as wide, with transverse grooves on ventral 



surface on either side of midline insolita (p. 514) 



Trunk three times as long as wide, ventral surface smooth, with- 

 out transverse grooves pinguis (p. 515) 



CLAVELLA UNCINATA (Muller) 



FlGUKE 302 



Lemaea uncmata Mulleb, Zoologiae Danicae prodromus, p. 38, pi. 33, fig. 2, 1776. 

 Clavella uncinata Wilson, Proc. U. S. Nat. Mus., vol. 47, p. 680, pis. 27, 48, 

 49, 1915. 



Occurrence. — Found in abundance on the gills of the common cod 

 caught in the vicinity of Woods Hole, also on the gills of the pollack, 

 haddock, and hake. 



Distribution. — Danish coast (Muller, Kr0yer) ; northern Atlantic 

 and Pacific (Desmarest, Blainville, Nordmann) ; Belgian coast (Ben- 

 eden) ; English seas (T. and A. Scott, Baird, Thompson) ; Roscoff 

 (Vogt) ; Mediterranean (Brian) ; Iceland and Greenland (Han- 

 sen) ; Vancouver Island (Fraser) ; Casco Bay, Me. (Wilson) ; Woods 

 Hole (Eathbun, Wilson). 



