216 Transactions of the Socidy. 



projections of the male, but rather thicker and shorter ; then 

 another curved sjDike, and then a fine hair. 



The two front pairs of legs are shorter and thinner than in the 

 male ; they are about equal in length, so that the first pair comes 

 further forward than the second. They greatly resemble the first 

 pair of legs in the male, except in their smaller size and the absence 

 of the spike on the tarsus. 



The two hinder pairs of legs are very difierent from those of 

 the male, being set further forward, and being longer, the 

 first three joints not nearly so thick, and the tarsi much longer 

 and more powerful, and not curved inward. The epimera of the 

 first pail" of legs are not joined to those of the second, nor to the 

 sternum ; those of the second, third, and fourth pairs are joined. 

 None of the epimera approach the median line of the body. 



The vulva is not protected by any sternite. 



Except as above mentioned, the hairs described for the male 

 exist also on the female. 



The Nymjph, and Nvhile Female. 



These resemble the adult female, except that the body of the 

 nymph is shorter, and that, in both, the body is softer and lighter, 

 and the chitinous masses smaller, and that there are not any chitinous 

 ridges joining the epimera of the second pair of legs to those of 

 the third. 



The creature was found parasitic on the cormorant (Phalacro- 

 corax carlo), and is not common. 



