MB. E. J. MIEES ON THE ID0TEIDJ5. 43 



of I. ochofensis, being more angulated and less rounded at the 

 postero-lateral angles. The colour (of the spirit- specimens) is a 

 purple-pink, with markings of light yellow and darker brownish 

 pink. Length of the largest example rather more than 1 inch 

 (27 millim.). 



It is possible that the examination of a larger series would 

 demonstrate the necessity of uniting this species with I. Whs- 

 nesenshii. 



b. Terminal segment distinctly emarginate at its distal end. 

 The species of this subsection may be distinguished as 

 follows : — 



* Epimera Iroad, tliose oftlie second to fourth segments occupying 

 the tvhole of the lateral margins. 

 Oblong-ovate : terminal segment with the postero-lateral angle 

 subacute. 1. /. emarginata (Fabr.). 



** Epimera of second to fourth thoracic segments occupying the 

 anterior part of the lateral margin. 



Oblong-ovate : antenna? not as long as the cephalothorax ; 

 terminal segment deeply emarginate, with acute postero-lateral 

 angles. 2. I. resecata, Stimpson. 



Slender : antennae robust, as long as the body (in the adult) ; 

 terminal segment sometimes with a small median cusp, postero- 

 lateral angles acute. 3. I. linearis (Linn.). 



Oblong-ovate : antennse not as Jong as the cephalothorax ; 

 terminal segment very slightly emarginate, postero-lateral angles 

 subacute. 4. I. indica, M.-Edw. 



*** Epimera not distinguishable in a dorsal view. 

 Suboblong: body dorsally carinated; terminal segment deeply 

 emarginate, with acute postero-lateral angles. 



5. I. hectica (Pallas). 



Idotea emaeginata. 



? Squilla mariua, De Geer, M6n. Hist, des Ins. vii. p. 522, pi. xxxii. 

 figs. 11-14 (1778). 



Cymothoa emarginata, Fabr. Ent. Syst. ii. p. 508 (1793). 



Idotea emarginata, Fabr. Ent. Syst. Supj^l p. 303 (1798); Latr. Hist. 

 Nat. Cr. et Ins. vi. p. 370 (1803) ; M.-Edw. Hist. Nat. Cr. iii. p. 130 

 (1840) : id. Cr. in Cuvier's Ehjne Anim. {ed. 3), pi. Ixix. fig. 2 ; White, 

 List Cr. Brit. Mus. p. 94 (1847) ; id. Cat. Brit. Cr. B.M. p. 65 

 (1850) ; id. Pop. Hist. Brit. Crust, p. 224 (1857); Hope, Cat. Cr. Ital. 



