ilE. E. J. MIEES OK THE IDOTETDiE. 47 



lateral angles acute. Eyes very small, in the middle of the lateral 

 margins. Anteunules very slender, scarcely surpassing the ante- 

 penultimate peduncular joint of the antennsp, with their basal 

 joints moderately dilated. Antennae as long, or nearly as long, as 

 the body without the postabdomen ; peduncle with the last two 

 joints elongated and subequal ; flagellum with 14-24 joints. 

 Epimera not evident in a dorsal view. All the legs very slender. 

 Terminal plate of the opercular valves longer than broad, foui*- 

 sided, with the posterior and outer angles rounded. The colour, 

 according to M. Lucas, is a fine green, laterally mai'gined and 

 minutely punctulated with reddish. Length nearly 1^ inch 

 (33millim.), breadth about 5: inch (7 millim.). 



This species inhabits the Mediterranean, but its range appa- 

 rently is not confined to that region. 



A male is in the Museum collection, preserved in spirit, 

 from S. Europe (P. B. AVebb), and a female, dry, from Tripoli 

 (T. Eitchie). 



In the Paris collection I have examined specimens (mostly 

 females) from the Mediterranean (Eoux), which are the types of 

 M.-Edwards's . description in the ' Hist. Nat. des Crustaces,' and 

 which, like all others I have seen, have a 3-jointed postabdomen ; 

 also a male from Nice (M. Eisso), a considerable series of both 

 sexes and different sizes from Algeria (M. Lucas), and others 

 without locality. There are also in the collection three specimens 

 in somewhat imperfect condition from Bourbon (M. Breon), which 

 I cannot distinguish specifically from /. hectica. 



Pallas's types, it may be observed, were from the Atlantic. 



Idotea ltfeaeis. 



Oniscus linearis, Linn. Syst. JVat. (ed. xii.) p. 1060 (1766); Pennant, 



Brit. Zool. iv. pi. xviii. fig. 2 (1777). 

 ? Asellus linearis, Olivier, Encycl. Meth. iv. p. 254 (1789). 

 Idotea tridentata, Latr. Gen. Crust, et Ins. i. p. 64 (1806) ; Lam. Hist. 



Anim. sans Vert. v. p. 160 (1818); Grube, Abh. schlesisch. Gesellsch. 



vaterl. Cultur, p. 125 (1867)? 

 Idotea hectica, Leach, Edinb. Encycl. vii. p. 404, nee Pallas. 

 Stenosoma lineare. Leach, Linn. Trans, xi. p. 366 (1815); Desm. Consid. 



Cr. p. 299, pi. xlvi. fig. 12 (1825) ; Guerin, Expl. dans la Mor^e, iii. 



Cr. p. 49 (1832); Brulle in Webb ^'- Berthelot, lies Canaries, Cr. 



p. 18 (1836-44). 

 Idotea linearis, Latr. (pt.) Hist. Nat. Cr. et Ins. vi. p. 371 (1803); 



M.-Edw. Hist. Nat. Cr. iii. p. 132 (1840) ; id. Cr. in Regne Anim. de 



