328 ME. E. J. MTERS'S EETTSTOK OF THE HIPPTDEA. 



Albunea guerinii, Lucas, Rev. et Mag. Zool. (ser. 2) v. p. 47, pi. i. fig. 9 



(1853). 



This species, according to M. Lucas, diiFers from Albunea 

 symnista (with which species he confounded it in the Explor. 

 Algerie, i. p. 27, pi. iii. fig. 2) in the shorter and narrower ocular 

 peduncles, less elongated and crowded frontal spines, which are 

 broader at base, and in the form of the terminal segment of the 

 postabdomen, which is altogether cordiform in the male, broader 

 and ovate in the female. Length of the male 30-33 millims. 

 (1 inch 2-3 J lines) ; of female 40 millims (nearly 1 inch 7 lines). 



Hal). Grulf of Algiers {Lucas). 



As compared with A. symnista^ M. Lucas has shown (I. c. fig. 9, 

 a, h) that the terminal segment is scarcely notched, and attains 

 its greatest width nearer the base than the distal extremity, which 

 is represented as more acute than in that species. In the female 

 the terminal segment in A. guerinii is more broadly ovate. 



No explanation of the figures accompanies the description of 

 this species ; but if, as appears certain, the figure 9 h represents 

 the tarsus of the third pair of legs, a comparison of it with the 

 same joint of A. symnista figured on the same plate (fig. 8 d) 

 reveals another very marked distinction between the two species. 

 In A. symnista, as stated above, the terminal joint has a pro- 

 minent narrow linear lobe near its articulation with the preceding 

 joint. In A. guerinii this lobe is almost obsolete, scarcely indi- 

 cated by an obscure tubercle. 



ALErNEA MiCROPS, sp. n. PI. V. figs. 12, 13. 



Albunea microps, White, List Crust. Brit. Mus., Append, p. 129 (1847), 

 descript. nulla. 



In this species the carapace is somewhat broad and depressed, 

 with nine teeth on its anterior margin ; the eye-peduncles are 

 even broader and shorter than in A. symnista, being not twice as 

 long as broad at the base ; and the cornea is borne on a small 

 tuberculiform lobe or prominence. The terminal joint of the 

 third pair of legs is slightly broader, but not lobate at its 

 proximal end. The last segment of the postabdomen of the male 

 is nowhere as broad as that of A. symnista, and is narrowed to its 

 rounded distal extremity. Length of carapace a little over f inch. 



Bab. Sooloo Island {Coll. Brit. Mus.). 



A single specimen is in the collection. 



The rami of the appendages of the sixth segment are arcuate, 



