1450 CRUSTACEA. 



7. SQITILLOIDEA. Naranda and RecTcur of Count Miinster are re- 

 ferred here by H. G. Bronn (Index Palaeontologicus, ii. 575) ; and 

 also, with a query, Norna and Urda of the same author. 



8. ISOPODA. Arcliceoniscus and Palceoniscus of Edwards (Ann. des 

 Sci. Nat., xx. 326). Archaeoniscus, according to Edwards, is between 

 Spheroma and Ancinus. 



9. ENTOMOSTRACA. T. Rupert Jones adds to the Cytherinaa the 

 genera (or "subgenera") Cyfherella and Cythereis, based on the form of 

 the shell. Cyprella and Cypridella of Koninck (Descript. An. Foss.) 

 are genera proposed for Cyproid species found in the Belgian carbo- 

 niferous beds; and Dithyrocaris, Scouler (Portlock's Geol. Rep., Lon- 

 donderry, and Wm. King's Permian Fossils of England, p. 64, Palse- 

 ontograph. Soc., Pub. 1850), includes Carboniferous or Permian 

 species, which have been referred both to the Cyproidea and Apo- 

 doidea, it being uncertain whether the shell is properly bivalve or 

 not. Cytheropsis, M'Coy, includes Palaeozoic species that have been 

 referred to Cytherina; Beyrichia and Ceratiocaris, M'Coy (Brit. Pal. 

 Fossils, Mus. Camb., 4to, 1851, 135), are genera of other Palaeozoic 

 species. All the carboniferous and Palaeozoic species are referred to 

 the section Phyllopoda, near the bivalve genus Limnadia, by Bur- 

 meister and M'Coy. The abnormal number of segments in other 

 Palaeozoic Crustacea render it probable that this reference of them is 

 right. 



Entomoconchus, M'Coy (Jour. Geol. Soc. Dublin, ii.), and DapTi- 

 noidea, Hibbert (On the Burdie House Limestone, Trans. Roy. Soc. 

 Edinb., xiii. 180), are other related genera. The latter may be near 

 A pus. 



Eurypterus, Harlan, and Pterygotus, M'Coy, are other Palaeozoic 

 genera, probably of Entomostraca. Eurypterus has been supposed to 

 be related to Limulus. 



Belinurus, Koninck, Halicyne, von Meyer, are other genera, referred 

 to the Poecilopoda. 



