ON THE BRITISH EDRIOPHTHALMA. 



57 



the attendant appendages of the mouth, and two more important ones are 

 directed anteriorly to the supra-cesophageal or cephalic ganglion, which last 

 we have not satisfactorily made out, although we have traced the nervous 

 cord almost to its connexion with it, that is, up to the anterior or facial wall 



of the head. . ^ .-^ e 



The probability is, that there is no very great amount ot difference trom 

 that which is figured by Edwards and Audouin as belonging to the Amphi- 

 poda proper, or as given by Rouzel de Vauzeme, as observed in the aberrant 



genus of Cyamus. , ,■ ^ -i x- 



Any observations, either on the generalization or geographical distribution 

 of the order, we shall reserve until we furnish the second part of the Report 

 ' On the British Isopoda,' and here only remark that our experience induces 

 us to consider the ^wjo/j^porfa, inclusive of the aberrant group, as a modification 

 of the great Crustacean type!, as exemplified in the Macroura, rather than 

 as possessing a perfectly distinct characteristic, as asserted by Mr. Dana. 

 In this conclusion we approximate that already arrived at by Edwards m 

 his 'Observations on the Classification of Crustacea' (Ann. des Sci. Nat. 

 vol. xviii. n. s. p. 121). But he includes in his remarks the Isopoda and 

 the Pycnogonides, with which in this Report we have nothing to do. 



In the accompanying Table the species are arranged according to order. 

 Those which are in italics have never been previously recorded as British. 

 Those marked with an asterisk, are species which we have not examined, 

 and record upon the authority of previous authors. 



Order I. AMPHIPODA. 



Group A. NORMALIA. 



Division A.A. GAMMARINA. 



Subdivision A.A.a. Vagantia. 



Tribe a.a. SALTATORIA. 



Family OrchestidsB. 



Genus. Author. Species. 



Talitrus Bosc locusta 



Orchestia .... Leach littorea .... . . 



Deshayesii .... 

 Allorchestes . . Dana . . Dmiai 



imbricatus .... 

 Galanthis mihi LubbocUana . . 



Tribe b.b. NATATORIA. 

 Family Gammaridse. 

 Subfamily I. Stegocephalides. 

 Montagua mihi raonoculoides. . 



Author. 

 Latr. 

 Leach. 

 Audouin. 

 mihi. 

 mihi. 

 mihi. 



marinus. . . 

 pollexianus 

 dubius . . . 



Montagu, 

 mihi. 

 mihi. 

 mihi. 



