3J2 



DEC A POD A. 



MACROURA 



Pasiphaa Sivado, 



Specific character. External caudal laminae longer than the internal, whicl 

 are longer than the middle one. 



? Alpheus Sivado, Risso. Crust, de Nice, t. iii. f. 4. p. 93. DKSMAR. Con- 

 sid. sur les Crust, p. 240. LATH. Regn. Anim. deCur. 

 IV. p. 99. 



? Paidphcea Risso, Hist. Nat. de 1'Eur. Merid. V. p. 81. EDW. 



Hist. Nat. des Crust. IV. p. 426. GUER. Iconog. du 

 Reg. Anim. (Crust.) t. xxii. f. 3. THOMPSON, Ann. 

 Nat Hist. V. p. 256. 

 LEACH, MSS. in Mus. Brit. EDW. 1. c. p. 426. 



Savignii^ 



brevirostris, EDW. 1. c. p. 426. 



THE general form of this remarkable species distinguishes 

 it at first sight from every other known Crustacean. The 

 whole body is exceedingly compressed laterally, and the 

 carapace elongated and somewhat attenuated forwards. 

 There is scarcely a perceptible rostrum ; but immediately 

 behind the anterior margin of the carapace, is a small 

 triangular tooth, with the point turned forwards, and a 

 similar, one, but smaller, on each side just above the origin 



