MR. E. J. MIEIIS'S BEVISION OP THE HIPPIDEA. 329 



the inner longer and much narrower than the outer. The ter- 

 minal segment is membranaceous in its distal half, and the lateral 

 margins are inflexed. The transverse interrupted ridges on the 

 carapace are very distinctly marked, giving the animal a rugose 

 appearance. 



Albunea gibbesii. 



Albunea S3nQanista, Gibbes, Proc. Amer. Assoc, p. 18/ (1850), 

 Albunea gibbesii, Stimpson, Ann. Lye. Nat. Hist. New York, vii. p. 78, 

 pl.i. fig. 6(1862). 



This species bears a general resemblance to A. symnista ; but 

 the carapace is much broader in proportion to its length. There 

 are but six or eight teeth on the anterior margin of the carapace. 

 The ocular peduncles are narrower in proportion to their length, 

 and their outer margin is straight. The last joint of the second 

 pair of legs has a broadly triangular, not a narrow and prominent 

 lobe near its proximal end; that of the third pair is broader than 

 in A. symnista. The inner ramus of the penultimate pair of post- 

 abdominal appendages is much broader and nearly as long as the 

 inner ; and its terminal joint in the male is somewhat oblong, loitli 

 & narrow prolongation at its distal extremity. 



Hah, Elorida, St. Augustine and among the Keys {Stimpson) ; 

 Charleston Harbour {Gibhes); south-eastern coast, United States 

 {Coll. Brit. Mus.). 



The single specimen of this species in the British-Museum 

 collection is a male. The form of the terminal segment in the 

 female is not stated ; that of the same segment in the male serves 

 to distinguish the species from all its congeners. The length of 

 the carapace a little exceeds 1 inch. 



Albunea oxtophthalma. PI. Y. figs. 14, 15. 



Albunea oxyophthalmus. Leach {MS.); White, List Crust. Brit. Mus, 

 p. 57 (1847), sine descr. 



This species is nearly allied to A. symnista, but difiers as 

 follows : — The eye-peduncles are very long, narrow, more than 

 three times as long as broad at the base, with their outer margins 

 straight. There are ten to twelve teeth on the anterior margin 

 of the carapace, on each side of the median notch. The lobe at 

 the proximal end of the last joint of the third pair of legs is pro- 

 minent, triangular, and acute, but not so narrow at base as in A, 

 symnista. The terminal segment of the postabdomen in the male 

 is scarcely longer than broad, broadest in the middle, nearly 



24* 



