104 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



vol.. 53. 



capable of but little protrusion; mandibles unknown; no maxillae or 

 maxillipeds; four pairs of swimming legs close together just behind 

 the head. 



Suhfamily characters of copepodid male (genus PennelTa). — Body, 

 like that of Cyclops^ composed of a cephalothorax covered with a 

 carapace having lateral and posterior lobes; three free thorax seg- 

 ments, a fused fifth and genital segment, and a one-jointed abdomen; 

 anal laminae very short and armed with minute setae. Two pairs 





Q-ftX 



FlQ. D.— THB male (left) and female (right) COPEPODID larvae of PENNELLA VARtANS 

 AFTER WiERZEJSKi; ACTUAL LENGTH OF FEMALE, 0.80 MM. 



of antennae, second pair chelate; compound eye in the shape of a 

 transverse spindle; mandibles stilet-shaped; two pairs of maxillae, 

 second pair uncinate; one pair of stout, clawed maxillipeds; first two 

 pairs of swimming legs biramose, third and fourth pairs uni ramose, 

 all the rami two- jointed. Parasites of salt-water fish exclusively. 



Ontogeny of the genus Pennella. — The genital protoplasm forms 

 egg mother cells and ^gg daughter cells as in the Lernaeocerinae. 

 The oocytes acquire food and yolk material as they pass into the 

 oviduct, in which they are strongly flattened and packed in a single 

 row. The cement glands are separate from the oviduct and empty 



