TONE THORACICA. 



I SO POD A. 



NORMA LI A 



235 

 BOPYRIDJE. 



lONE THORACICA. 



Male. — NaiTOW, suliparallel, first segment of the body shorter than the 

 following, the remainder with the sides suhangulated. 



Female. — Pyriform, flattened, basal appendages of the tail multi-ramose. 

 Length of female, about one-quarter of an inch. 



Oniscus tlioraclcus. 

 Oniscus (lone) thoracicus. 

 lone thoracicus. 



Montagu, Trans. Linn. Soc. ix. p. 103, pi. 5, f. 3. 



Latreille, Eiic. Meth. pi. 336, fig. 46. 



LATREiLLE,ini2e*7«e 4«.Ed. i. iii. p. 54. Lamarck, 

 Hist. Anira. sans Vertebres, v. p. 170. Desma- 

 KEST, Cons. Cruet, p. 286, t. 46, f. 10. Guerin 

 Menkville, Icon. R. Anim. Crust, t. 62, 

 f. 1, 2. Milne Edwards, Crust, iii. p. 280, 

 t. 33, f. 14, 15. CuviER, Regne Anim. (Edit. 

 Crochard) Crust, t. 59, f. 1. White, B. M. 

 Cat. Brit. Crust, p. 81. Pop. Hist. Brit. 

 Crust, p. 254, pi. xiv. f. 8a (male), b (female). 



It is to Colonel Montagu that we are indebted for the 

 first knowledge of this interesting parasite, which inhabits 

 the branchial cavity of Callianassa subterranea, concealing 



