ME. E. J. MIEES ON THE IDOTEID^. 45 



The Britisli-Museum collection contains specimens from various 

 localities on the British coasts (Col. Montagu and Dr. Leach) and 

 a male from the Mediterranean, all preserved dry ; also two males 

 from Bohuslan (Dr. A. W. Malm), preserved in spirit. In the 

 Paris collection also are two specimens from Bohuslan (IMalm), 

 and others without locality. 



Mr. Norman, in Messrs. Brady and Robertson's Eeport on 

 dregding in the West of Ireland, in the Ann. & Mag. Nat. Hist, 

 for 1869, above quoted, mentions the occurrence of the young of 

 this species in extraordinary abundance among Algse between 

 Ardbear and Manniu Bays. 



In young individuals the body is relatively narrower, and the 

 terminal notch is often shallower than in the adult. 



The colour of the two small specimens obtained by Mr. Parfitt 

 (t. c.) w^as deep chocolate or reddish brown, with a row of Avhite 

 ocelli-like spots along the dorsal ridge and tw^o or three w^hite 

 blotches on the side ; posterior edge of the tail edged with white ; 

 legs dark, and claws bright vinous red. 



Idotea eesecata. 



Idotea resecata, Stimpson, Bost. Journ, Nat. Hist. vi. p. 64, pi. xxii. 

 fig. 7 (1857) ; id. Proc. Bost. Soc. Nat. Hist. p. 88 (1859). 



The body is convex aloiig the middle line, with slight indi- 

 cations of a median dorsal keel. Head (in the Museum examples) 

 smooth above, with its anterior margin distinctly emarginate ; 

 first segment of the thorax with its antero-lateral lobes broad 

 and subtruncated ; postabdomen slightly broader anteriorly, and 

 equalling in length the four posterior thoracic segments taken 

 together, composed of three segments, vi^ith lateral indications of 

 a third, distal end of the terminal segment deeply emarginate, 

 postero-lateral angles on each side prominent and acute. Eyes 

 small. Antennules reaching to the distal end of the ante- 

 penultimate segment, with their basal joints greatly expanded, 

 suborbiculate. Antennae, when retracted, reaching or nearly 

 reaching to the fourth thoracic segment ; peduncle rather stout, 

 with the last joint a little shorter than the penultimate joint ; 

 flagellum slender, l7-20-jointed. Epimera, of the second to foin-th 

 segments (in the Museum examples) linear, and occupying only 

 a part of the lateral margins, of the fifth to seventh segments 

 broader and occupying the whole length of the lateral mai'gins ; 

 epimera of seventh segment wdth postero-lateral angles acute. 

 Terminal plates of the operculum quadrate. Length of largest 



