DECAPODA. 53 



latera, and simply pubescent. The ocular pedicles are longer than 

 those of the Dromice. 



But a single species, the Dynomene hispide, Desmar., Consid., 

 XVIII, 2, is known; it is found at the Isle of France. 

 The last Notopoda differ from the preceding in the feet, all of 

 which except the claws, terminate in a fin, and from all the Brachy- 

 ura in the extension of their tail. Such is the 



Ranina, Lam., 



In which the elongated shell is gradually narrowed from before 

 backwards, and usually resembles a reversed triangle with a den- 

 tated base. The ocular pedicles are extended, and the lateral an- 

 tennae long and projecting. The external foot-jaws are similarly 

 lengthened and narrow, and the extremity of the third joint is com- 

 pressed into a point. All the feet are closely approximated, or 

 almost contiguous at their origin, and from the fourth pair ascend 

 towards the back; the two last, however, are alone on it. The for- 

 ceps are compressed, have the figure of a reversed triangle, and are 

 dentated; the fingers are suddenly flexed. 



These Crustacea are closely allied to the Albuneae of Fabricius, 

 the first sub-genus of the following family, and thus form the passage 

 from the Brachyura to the Macroura. From the approximation of 

 the feet it is even probable that the genital orifices of the female are 

 situated as in the Macroura. According to Rumphius, they not 

 only leave the water, but even climb to the tops of houses; from the 

 form of their feet, however, this appears impossible, or at least very 

 improbable. 



A fossil species was described by Aldrovandus, which the 



Abbe Ranzani and M. Desmarest have since made better 



known(l). 



(1) Ranina Mdrovandi, Ranz., Mem. di Stor. Nat.; Desmar., Hist. Nat. des 

 Crust. Foss., VI, xi, 1. The fig - , x, 5, 6, appears to us to belong 1 to a Hippa rather 

 than to a Ramina; Ramina serrata, Lam. 5 Cancer raninus, L. ; Mbunea scabra, 

 Fab.; Rumph., Mus., VII, T.V.; Ranina dorsipes, Lam,; Mbunea dorsipes, Fab.; 

 Rumph., Mus., X, 3; Desmar., Consider., XIX, 2. 



The genus Symethis, Fab., is unknown to us, but we presume it is allied to the 

 Raminse, or to the first subgenera of the subsequent family. 



