272 THE VOYAGE OF H.M.S. CHALLENGEE. 



1853. BURGERSDIJK, L. A. J. 



Land- en Zoetwater schaaldieren. (In Bouwstoffen v. e. Fauna v. Nederl. I. 

 bl. 164.) 1853. 



This work is included in Maitland's list of authorities, 1875. He refers to it only for one of the 

 localities of Gammarus jmlex. 



1853. Costa, Achille. 



Fauna del Eegno di Napoli. 



The genus Gnerinia, Hope, is described, with the type species Guerinia nicseetisis, which is 

 figured. 



Phrmiima, LatreUle, i.s described, and the type species Phi: sedentaria, Forskal, to which Pisitoe 

 levifrons, Raiinesque, is united as a synonym, while Plironima custos, Risso, though not 

 included in the synonymy, is declared in the " observations " to be also identical with 

 Forskftl's species. The genus Phrosine, Risso, is described, and of Risso's two species, 

 Phrodne semilunata is fuUy described and figured, while Phrosine macro^jhthalma, which 

 Costa had not himself seen, is briefly alluded to. Costa would have preferred to name the 

 two respectively vornuta and inermis. He considers Pisitoe hisjnnosa, Rafinesque, though 

 inaccurately described, probably the same species as Phrosine semilunata. 



1853. Costa, Achille. 



Descrizione di tre nuovi crostacei del Mediterraneo discoperti dal Rev. G. F. 

 Hope. Estratta dal fascicolo 83° della Fauna del Regno di Napoli. 10 pages. 3 

 plates. 



This work is obviously due to tlie pen of Achille Costa, although the new genus, and two out of 

 the three species, are attributed to Hope. 



The new genus Guerinia is thus described : — " Generis characteres essentiales. Pedes prinii 

 paris validissimi, prehensiles, manu magna vaHde uncinata ; secundi graciles, hand prehen- 

 siles, ungue destituti. Antennae superiores bisetse ; seta primaria articulo primo maximo. 

 Oculi magni, reticulati, dorso fere contigui. 



" Characteres naturales. Corpus crassum, parum conipressum, dorso rotundatum. Caput antice 

 horizon taliter rotundato-productum. Oculi maximi, dorso sub-contigui, totam fere capitis 

 superficiem occupantes, distincte reticulati. Antennae superiores bisetse ; seta primaria 

 articulo primo valde elongato, valido : inferiores infra et inter superiores insertse, basi 

 contiguse. Pedes primi paris manu magna crassa, ungue valde arcuato armata : secundi 

 longi, graciles, articulo ultimo ciliis fimbriato, ungue nuUo ; reliqui sLmplices. Abdomen 

 lamina horizontali terminatum." 



In the observations that follow, this Crustacean is regarded as a sort of link between the 

 Amphipoda and the parasitic Isopods, such as Anilocra. By Spence Bate, in the Brit. Mus. 

 Catalogue, it is placed between Lafijstius and Lepidadylis. The type species is named 

 Guerinia nicsensis, and is beyond doubt generically, perhaps also specifically, identical with 

 the laXer " Trischizostoma Raschii, " TtLamark and Boeck, 1860. Boeck, who had obviously 

 not met ^^^th Costa's paper, fuUy describes the mouth-organs, and points out that the relations 

 of the genus are with the Hyperidse, Orchestidje and Lysianassinas. He places it by itself 



