OF SOUTH DEVON. 293 



Genus CYAMUS. 



Leptombra, sub-genus. 



L. (Proto, Leach ; Can. Gam. pedatus, Mont. ' Linn. Trans.' xi.) 



Caprella, sub-genus. 



C.phasma, Lamarck, (Cancer phasma, Mont. ■ Linn. Trans.' vii.) 



C.penantis. Devon ; Leach, ' Edin. Encyc' vii. 404. 



C. acanthifera. Ditto. 



Order V. — Isopoda, want palpi to their mandibles; feet 

 always fourteen in number, unguiculated, and without vesci- 

 cular appendages at the base ; under part of tail furnished 

 with leaflets or vescicular pouches, the two exterior usually 

 covering the others ; body generally flattened ; the females 

 carry their ova under the breast ; the young are born with the 

 form and parts proper to their species, and only change the 

 skin while growing. 



Genus ONISCUS. 



Section 1. Epicarides. 



Bopyrus, sub-genus. 



B. crangorum, (Oniscus squillorum, ' Mont. Linn. Trans.' ix.) 



Section 2. Cymothoades. 



Rocinela, sub-genus. 



R. Danmoniensis. Plymouth Sound ; Leach, ' Diet, des Sci. Nat.' xii. 

 Conilera, sub-genus. 



C. Montagui. Sal combe estuary ; Leach, ditto. 

 Eurydice, sub-genus. 



E. pulchra. Bantham, vulgatissime ; Leach. 

 Limnoria, sub-genus. 



L. terebrans. I have shown this to be too common at Plymouth ; see 

 'Mag. Nat. Hist.' vol. ii., New Series, p. 206. 



Section 3. Sph<Bromides. 



Sph^roma, sub-genus. 



S. serrata. Devon ; Leach, ' Linn. Trans.' xi. 368. 



S. Prideauxiana. Leach, ' Diet, des Sci. Nat.' xii. 



S. rugicauda. Wierhead on the Tamar ; Leach, ' Ed. En.' vii. 405. 

 NjEsa, sub-genus. 



N. bidentata. Leach, ' Ed. En.' vii. 405. 



N. hirsuta, (Campecopea, Leach). Devon; Mont. ' Linn. Trans.' vii. 

 Cymodocea, sub-genus. 



C. truncata. On fuci, rare; ' Ed. Ency.' vii. 433. 



C. emarginata. Mount Edgecumbe ; Leach, ' Diet, des Sci. Nat.' xii. 

 Dynamene, sub-genus. 



D. Montagui. Leach, ' Diet, des Sci. Nat.' xii. 

 Anthura, sub-genus. 



A. gracilis, (Oniscus, Mont. ' Linn. Trans.' ix.) Very rare. 



