THE CRUSTACEA OF NEW JERSEY. 89 



Other material, and I have examples in great number from 

 the region of Chincoteague in Accomac County, Virginia, were 

 secured during May of 19 12. Numbers of menhaden examined 

 there were found to be greatly infested. I also have one of these 

 parasites taken from a small menhaden, though the parasite itself 

 is quite adult, from Fort Macon, in North Carolina, many years 

 ago by Dr. H. C. Yarrow. 



On July 3d, 1 91 2, I examined a menhaden (Brevoortia 

 tyr annus) which had several examples of this lernean punctured 

 through its back. The fish was caught in Great Bay in Ocean 

 County. 



Genus PENNELLA Oken. 



Pennella Oken, Lehrb. Zoolog., I, 1815, p. 358. Type Pennella diodontis 



Oken, monotypic. 

 Penella, Penellus, auct. 

 Lerneopenna Blainville, Journ. Phys. Chim. Hist. Nat. Paris, XCV, 1822, p. 



378. Type Lerneopenna bocconii Blainville, first species. 

 Lerneopinna, auct. 

 Bacillus Lubbock, Trans. .Linn. Soc. London, XXIH, i860, p. 190. Type 



Bacillus elongatus Lubbock, monotypic. 

 Hessella Brady, Rep. Voy. Challenger, Copepod., VIH, 1883, p. 136. Type 



Hessella cylindrica Brady, monotypic. 



Female. — Head large, globose, tuberculate, with arm-like pro- 

 jections directed backwards. Neck long, straight, not distinctly 

 segmented, united with elongated genital segment in same line. 

 No antennae. Only one pair of foot-jaws, which simple and 

 hooked. Four pairs of limbs present, placed close behind head 

 or under surface of body and together, first two'biramose. and 

 third and fourth uniramose, each branch with two joints. Feet 

 always quite small or entirely rudimentary. Abdomen penni- 

 form. 



Male. — Of very small size. Body globular, and more imper- 

 fect than in most of related genera, without distinct thorax and 

 no rudiments of feet behind appendages representing foot- jaws. 



Remarks. — The females are attached to their hosts by only 

 their anterior extremity of the body, forcing the entire head 

 into the tissues of the animal to which they adhere, and remain 



