412 



ISOPODA. 



NORMAL1A. 



SPHJSROMUXE. 



SPrLEROMA CURTUM. 



Specific character. Upper surface smooth ; second, third, arid fourth seg- 

 ments of the pereion terminating laterally in a sharp point on each side ; the 

 three following more oval at the lateral extremities. Terminal segment of 

 the pleon with two large rounded and broad tubercles ; extremity produced in 

 the middle into an obtuse point, with a notch on each side ; both plates of 

 the lateral appendages of the tail obliquely truncate. 



Length, one-fourth of an inch. 



SplicKroma curtum. LEACH, Diet. Sc. Nat. xii. p. 345. DESMAREST, 



Cons. Crust, p. 299. MILNE EDWARDS, Crust. 



iii. p. 209. 

 Var. Sphwroma GriffitJisii. LEACH, MSS. in Brit. Mus. W. THOMPSON, in 



Ann. Nat. Hist, xx. p. 246. WHITE, B. M. 



Cat. Brit. Crust, p. 76. 



THIS species is now for the first time described and 

 figured from Dr. Leach's typical specimen in the British 

 Museum, named by him Sph. Griffithsii, which we con- 

 sider to be a fully developed individual of Sph. curtum, 



