('limn/ex in ('riiKtiirr<ui Nomenclature. 171 



the species lont/iniana Linnuais, for which in 1815* Leach forms 

 the genus L*unln'u*. Ltunbrii* therefore is a synonym of Parthe 

 nope Weber. Tin* -species horridn hitherto regarded as type of 

 Parthenope needs a new generic name, Daldorfia. 



Lamarck t gives the type of the Inachm group as eriocheles 

 Lamarck [= LitJtodes nuijn (Linnaeus)], but as this species is not 

 included by Weber in the original species of Inachus it can not 

 serve as the type, which remains as hitherto considered, /. dor- 

 settensis (Pennant) 1777 (=/. scorpio Fabricius 1781). 



A word as to the genus Maja Lamarck which was made to 

 include Inachv* + Parthenope. According to that rule of nomen 

 clature, " If a later name be so defined as to be equal in extent 

 to two or more previously published genera, it must be cancelled 

 in toto," Maja must lapse. Mamaia has recently been published 

 by Stebbing t for the species squinado formerly considered the 

 type of Maja; 'but the reasons for the change have not yet been 

 published . 



5. Eim/ala Weber has one species, Hippa dentata Fabricius 

 1793, which is later made the type of Corystes by Latreille. 

 The species should be known as E. cassivelaunus (Pennant) 

 1777 . It is worthy of note that in the Kiel Museum there is a 

 dried specimen of this species with the inscription ' ' Euryale 

 dentata F." 



6. Idotea Weber contains two species, adactila and armigera, 

 new name for Astacus emeritus Fabricius. In 1900|| I showed 

 that the first of these species, adactyla, is the type of Hippa 1787 ; 

 and that decision is not altered in the light of earlier but similar 

 removals of the various other species by Weber in 1795. The 

 second species of Idotea, emerita, is therefore its type, but this 

 species has been reckoned the type of Emerita Gronovius 

 1764 (not 1763) by Benedict, 1i and if this action be sustained, 

 Idotea Weber becomes a synonym of Emerita; it is obvious that in 

 any event Idotea is not available for a genus of Isopods as defined 

 by Fabricius 1798. The inclusion of adactyla and emeritus in 

 Idotea is referred to by Roux under Idotea in ' ' Crustaces de la 

 Mediterranee," 1828, but is there attributed to Daldorf. 



* Trans. Linn. Soc. London, XI, 308 and 310, 1815. 



fSyst. Anim. sans Vert., 154, 1801. 



J Spolia Zeylanica, II, pt. V, p. 2, April, 1904. 



?Hist. Nat. Crust., Ill, 27, 1802. 



I! Proc. U. S. Nat. Mus., XXII, 301, 1900. 



''Bull. U. S. Fish Comra. for 1900, vol. 2, p. 138. 



