ISOPOD CRUSTACEA 



PART II. THE SUB-ORDER VALVIFERA. FAMILIES: IDOTEIDAE, 

 PSEUDIDOTHEIDAE AND XENARCTURIDAE FAM.N. 



With a Supplement to Isopod Crustacea, Part I. The Family Serolidae 



By Edith M. Sheppard 



Department of Zoology, Cardiff 

 (Plates VIII and IX; text-figs. 1-22) 



INTRODUCTION 



THIS paper deals with the Valvifera collected during the years 1925-36 by the Discovery Investi- 

 gations, with the exception of the family Astacillidae (Arcturidae). 



The suborder Valvifera, according to Barnard's (1920, p. 381) analytical key of the principal 

 families, includes the Idoteidae, Pseudidotheidae, Amesopodidae and Astacillidae. Nordenstam (1933, 

 p. 93) pointed out that Barnard did not mention the two families Chaetiliidae and Holognathidae, 

 the former proposed by Dana (1852) to contain his species Chaetilia ovata, the latter proposed by 

 Thomson (1904) for his species Holognathiis stewarti (Filhol). Nordenstam suggested that these two 

 species should be included in the family Idoteidae, the former in his new subfamily Macrochirido- 

 theinae, the latter in the subfamily Idoteinae. To the families included in this suborder must now be 

 added the new family Xenarcturidae, formed to contain the new genus Xenarcturus from the 

 Discovery collections. 



In the classification of the Valvifera which follows, only those genera have been included to which 

 reference is made in this report: 



Suborder Valvifera 



Family Idoteidae 



Subfamily Idoteinae, Dana, 1852 



Genera Idotea Fabricius, 1798 



Paridotea Stebbing, 1900 

 Synidotea Harger, 1878 

 Edotia Guerin-Meneville, 1844 

 Holognathus Thomson, 1904 



Subfamily Mesidoteinae, Racovitza and Sevastos, 19 10 



Genus Mesidotea Richardson, 1905 

 Subfamily Glyptonotinae, Miers, 1881 



Genus Glyptonotiis Eights, 1852 

 Subfamily Macrochiridotheinae, Nordenstam, 1933 

 Genera Macrochiridothea Ohlin, 1901 

 Chaetilia Dana, 1849 

 Chiriscus Richardson, 1911 



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