22 ME. E. J. MIEES ON THE IDOTEID^. 



slender, small, and of nearly equal lengtli, the first, however, being 

 more robust. Epimera narrow, not reaching, in the second to 

 fourth segments, quite to the posterolateral angles of the segments; 

 in the fifth to seventh segments the epimera are acute and pro- 

 longed backward beyond the thoracic segments. Opercular valves 

 with their distal plates small, rounded off at their posterior and 

 external angles. The colour (according to M. Eisso) of the body 

 is olive-green, with a longitudinal median and two lateral blackish 

 lines; all the segments with scattered punctulations ; postabdomeu 

 of an opaque grey. Antennae annulated with white and brown ; 

 legs yellowish. Length of the largest male I have examined about 

 -^ inch (15 mm.) ; but many of the specimens are much smaller. 

 This species inhabits the shores of the Mediterranean and 

 Adriatic, and its range extends northward to the shores of the 

 English Channel. 



The description (except as regards colour) and measurements 

 are taken from specimens in the collection of the Paris Museum, 

 which, I doubt not, are correctly referred to this species, and of 

 which two have been obtained (in exchange) for the British 

 Museum. M. Eisso's description and figure would lead one to 

 suppose that the jointed flagellum is absent ; and it is evident from 

 the description of Messrs. Bate and Westwood that the joints 

 are sometimes imperfectly defined. Dr. Heller particularly men- 

 tions the existence of a short 3-5-jointed flagellum in specimens 

 from Lesina. There are in the Paris collection seven specimens 

 (males and females) from Bona (M. Lucas). 



The Eev. A. M. Norman kindly sent to me for examination a 

 specimen of I. parallela from Paignton, S. Devon, presented to 

 him by the Eev. T. E. E. Stebbing, wbich places the correctness 

 of the identification of the British species with the Mediterranean 

 I. prismatica beyond a doubt. In it, however, the articulations 

 of the flagella of the antennae are scarcely distinguishable ; and, as 

 I have already noted. Bate and Westwood in their description 

 mention the partial consolidation of these joints. In most, if not 

 all, of the specimens from the Mediterranean the joints of the 

 flagellum are perfectly distinct. 



IdOTEA ? MEDITEEEAKEA. 



Zenobia mediterranea, Risso, Hist. Nat. Eur, merid. y. p. Ill (1826) ; 

 Hope, Cat. Cr. Itah p. 27 (1851). 



Differs from the preceding, according to M. Eisso, only by its 



