ME. E. J. MIEES ON THE IDOTEIDiE. 15 



Idotea entomon occurs, according to Grrimm, Zeitsch. f. wiss. 

 Zool. XXV. p. 324 (1875), in great abundance in the Caspian Sea ; 

 but it does not appear, from this author's note, whether this is 

 the species here described as G. entomon. 



There is a specimen, labelled entomon, of this species in the 

 Linnean Cabinet in the possession of the Liuneau Society ; hence 

 there can be little doubt that this is the true entomon of Linnaeus. 

 It is certainly the species so designated by Pallas, since be 

 figures the last two joints of the peduncle of the antenna) of the 

 elongated, less dilated form characteristic of our Baltic examples. 



The Idotee vitee, Bosc (Hist. Nat. Crust, ii. p. 180, 1802) 

 {Idotea vittata, Latr.) has the body composed of ten segments, of 

 a grey colour punctated with brown, with a broad yellow band 

 on the back ; tail elongated and pointed. It is allied, according 

 to Latreille, to Idotea entomon, but is scarcely 3| lines in length, 

 and the segments are without lateral appendages (epimera ?). 

 On account of the last-mentioned character, I doubt if it should 

 be referred to this genus. It was found in the open sea. 



GrLYPTONOTUS Sabini. (Plate I. figs. 3-5.) 



? Idotea Sabinj, Kroyer, Nat. Tidsskr. (2 R.) ii. p. 401 (1847); Atlas of 

 Crust, in Gaiviard's Voy. en Scand. pi. xxvii. fig. 1 ; Rehihardt, Fori- 

 egnelse over Gronlands Krebsdyr, jj. 34 (1857) ; LiUken,List of Crust, 

 of Greenland in Arctic Manual, p. 149 (1875) ; Sars, Arcli.f. Math, 

 og Naturvidensk. ii. p. 350 (1877) ; var., Heller, Denkschr. derAkad. 

 Wien, XXXV. p. 38 (1878). 



? Chii'idothea megaluva, G. 0. Sars, Archivf. Math, og Naturvidenskab . 

 iv. p. 432 (1880). 



In this species the body is narrower and more elongated than 

 in Gr. entomon, and the postero-lateral angles of the first segment 

 and of the epimera of the second segment are not so much pro- 

 longed backward and are less acute. The terminal postabdominal 

 segment appears to be firmly ankylosed with the fourth, and is 

 sinuated on the sides at the base, and again at a point rather more 

 than halfway to the apex, which is slightly recurved. The penul- 

 timate and terminal joints of the peduncle of the autennse are 

 flattened above and considerably dilated, with the margins cristi- 

 form and acute ; the flagellum 7-8-jointed. The largest specimen 

 I have seen is about 3^ inches long (80 millim.), and rather more 

 than 1-j^inch broad. (29 millim.). 



I doubt whether the characters assigned to the ChiridofJiea 



