406 CRUSTACEA. 



from the base and increasingly so towards the apex. The two are 

 contiguous by their inner side, except at base ; and between the bases 

 of the two, in the semicircular excavation of the front, there is a small 

 triangular piece ; the centre of this excavation bears a minute tooth. 

 The small teeth exterior to the eyes are about ten in number, with, in 

 some cases, a minuter tooth intermediate. 



ALBUN^EA SCUTELLATA, Desmarest. 

 San Lorenzo? 



Length of carapax of a female, six lines 5 breadth, seven lines ; 

 breadth of large or second abdominal segment, six lines ; of fourth, 

 five and a half lines ; of fifth, one and one-fourth lines. These pro- 

 portions are different from those in the figure by Edwards (Crust., pi. 

 21, f. 9), yet the species appears not to differ. The hand is very thin 

 and high, the height being equal to the length ; the lower margin is 

 slightly arcuate, and not at all deflexed at the base of the immoveable 

 finger; this finger is acute and short, the margin above it vertical and 

 hairy. The front margin has a low median point, and also another 

 equally advanced, half way to the side, with the margin between 

 sinuous. 



Albunsea scutellata, DESMAREST, Crust., p. 173 ; EDWARDS, Crust., ii. 204, pi. 21, 

 figs. 9-13. 



ALBUNHIPPA SPINOSA, Edwards. 

 San Lorenzo, Peru. 



Length of carapax, one and one-fourth inches. The surface has a 

 peculiarly smooth and almost porcelain polish. 



Albunhippa spinosa, EDWARDS, Arch, du Mus. d'Hist. Nat., ii. 474, pi. 28. 



The Blepharipoda occidental of Randall, from California (Jour. Acad. Nat. Sci., viii. 

 131, pi. 6), is another species of this genus, having the lower margin of the hand one- 

 toothed near middle, and sharp three-toothed below the immoveable finger; moreover 

 the margin of the carapax is very hairy. 



