4 MR, E. J. MIERS ON THE IDOTEID^. 



consulted), the Eev. T. E. E. Stebbing, Prof. S. Loven, and others 

 for assistance and information. 



Whenever possible, I have taken my descriptions from typical 

 or well-authenticated specimens of each species. In not a few- 

 cases, however, where no specimens have been availa^ble for exa- 

 mination, or where the material has been insufficient, the descrip- 

 tion has been taken wholly or iu part from a previous author ; 

 such alterations being usually made as are necessary to ensure 

 uniformity in the terminology employed and in the sequence of 

 the parts described. Thus, wherever possible, the several segments 

 of the body are first described, and afterwards their appendages 

 in regular succession, whereby it is hoped the comparison of allied 

 species will be facilitated. The difficulty of verifying the very 

 numerous references to the synonyms has been great, and there 

 still remain certain publications which I have been unable to 

 consult ; but these are not referred to unless the original citation 

 was made upon good authority. 



InOXEID^. 



Idoteides, M.-iJrfw. {,'part.). Hist. Nat. Crust, iii. p. 121 (1840). 

 Idotseinse, Dana, Amer. Journ. Sci. and Arts (ser. 2) viii. p. 426 (1849). 

 Idotseidse, Dana, Amer. Journ. Sci. and Arts (ser. 2) xiv. p. 300 (1852) ; 



id. U.S. Expl. Exp. xiv. {Crust, ii.) p. 697 (1853). 

 Idoteidse, ^S*. Bate and Westwood, Brit. Sessile-eyed Crust, ii. p. 375 



(1868) ; Miers, Cat. New-Zeal. Crust, ip. 91 (1876) ; Harger, Isopoda 



in Rep. U.S. Fish Comm. (part vi.) p. 335 (1880). 



The Idoteidce com-pvised in this revision correspond to the genus 

 Idotea of Milne-Edwards and to the Idoteidod of Dana, Messrs. 

 Bate and Westwood, Harger, and other authors, and may be charac- 

 terized as follows : — Body ovate or oblong, or more or less oblong- 

 ovate ; head and thoracic segments distinct ; postabdomen with 

 some or all of its segments consolidated into a large terminal 

 scutiform piece. Eyes usually lateral, but sometimes placed on 

 the dorsal surface of the head. Antennules four-jointed and 

 usually shorter than the antennse, which have a five-jointed pe- 

 duncle and terminate in a flagellum, which may be short, rudi- 

 mentary, or composed of a single joint, or (more usually) multi- 

 articulated. Mandibles non-palpigerous ; maxillipedes operculi- 

 form. Legs usually subsimilar iu form, the three anterior pairs 

 directed forward; but in Glyptonotus the first three pairs ter- 



