422 BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM 



sinus. Genital segment half the width of the carapace, with convex 

 lateral margins armed with a row of long spines, and slender pos- 



FiGDEE 265. — Aleiion fuscus: a. Female, dorsal ; b, female, 

 third leg 



terior processes, laterally compressed and fringed with spines. Abdo- 

 men 2-segmented, basal segment considerably the larger, with posterior 

 precesses; caudal rami four times as long as 

 wide. Total length, 8-10 mm. 

 31 ale . — Unknown . 



Bemarks. — This species can be distinguished 

 by its darker color and by the shape and size of 

 the dorsal plates on the fourth segment. 



ALEBION CARCHARIAE Kr^yer 



FiGtJEE 266 



AleMon carchariae Kr0yer, Naturh. Tidsskrift, ser. 3, 

 vol. 2, p. 165, pi. 12, 1863.— Wilson, Proc. U. S. Nat. 

 Mus., vol. 31, p. 704, 1907. 



Occurrence. — Found on the outside surface of 

 the common dogfish and the dusky shark at 

 Woods Hole, August, 1885. 



Distribution. — Northern Atlantic (Kr0yer) ; 

 Cape Verde Islands (Brady, Brian) ; Indian 

 Ocean (Bassett-Smith). 



Color. — Body a uniform cartilage gray and 

 fairly transparent. 

 Female. — Carapace orbicular, as wide as long, the median lobe 

 squarel}^ truncated posteriorly ; fourth segment two-thirds as wide as 



Figure 2 6 6 . — AleMon 

 carchariae: Female, 

 dorsal (drawn by A. 

 H. Baldwin, Septem- 

 ber, 1887) 



