SPHJEROMA PRIDEAUXTANUM. 



415 



ISOPODA. 



NORMALIA. 



SPH^EROMA PR1DEAUXIANUM. 



Specific character. Oblong-ovate ; cephalon very broad. Segments of the 

 pereion entire, convex; pleon with the penultimate joint produced into an 

 angulated lobe on each side of the posterior margin ; last joint with two 

 oblong carinse in the middle of the upper surface ; extremity produced into an 

 obtuse point, slightly notched on each side. 



Length, one -third of an inch. 



Sphczroma Prideauxianum. LEACH, Dictionn. Sci. Nat. xii. p. 345. DES- 



MAREST, Cons. Crust, p. 299. MILNE 

 EDWARDS, Crust, iii. p. 209. W. THOMPSON, 

 Ann. Nat. Hist. xx. p. 245. WHITE, B. M. 

 Cat. Brit. Crust, p. 76. 



OUR description and figure of this species are taken 

 from Dr. Leach's type in the British Museum. It is 

 more oblong than the preceding ; but has the two plates 

 of the lateral appendages of the tail short, the inner one 

 being obliquely truncate. The upper antennae have the 

 two basal joints broad and flat, the third joint slender, 



