REPORT ON THE AMPHIPODA. 347 



superantes, gracillimi, triyeuiculati. Pedes primi et seeundi paris minuti, validiusculi, 

 suhprehensiles ; — tertii et quarti coeteris longiores, gracillimi, JUiformes — quinti, sexti et 

 sepiimi normales. Pedes spurii primi, seeundi et tertii segmenii ahdomiiialis biremes, remis 

 setosis, setis utrinque Jimhriatis — quarti, quinti et sexti stylis hiarticulatis." The type species, 

 Natalius candidissimus, A. Costa, is defined as follows : — " N. (dims, immaculatits, oculis 

 tantum ruhris, antennis sex-articulatis, articulo prima valde inerassato, setoso ; pedibus p>rimi 

 et seeundi paris carp)0 elongato, infra in spinam validam antrorsum producto ; vianu 

 cylindracea, ungue parum arcuata ; tertii paris illis quarti paullo longioribus ; illis quinti, 

 sexti et septimi longitudine deci'escentibus, margine antico minutissime serrulatis ; articulo 

 prima parum dilatato ; pisdibus spuriis quarti, quinti et sexti segmenti abdominalis xque 

 terminatis. Longit. milKm. 13." 



The genus Natalius may perhaps be identical with Oxijcephalus, M.-Edw., with which Cams 

 doubtfully unites it, citing the palpi maxillares dua as " [? antenns. //.]," but that they are 

 the lower antennas is beyond question. The genus might be distinguished from Oxijceplialus 

 on the ground of its subprehensile gnathopods, did not the description of the type species 

 indicate that they are in fact complexly chelate. The species Natalius candidissimus. 

 Cams gives doubtfully as a synonym of Oxyccphalus similis, Claus, 1879; but except 

 that the specimens were taken in the same waters, the authors do not happen to take any 

 common characters, on which a comparison can be founded, unless the slenderness of the 

 first and second pera3opods be considered such. It is strange that Costa makes no reference 

 to OxycepJialus, and stranger still that he does not refer to Eipetoramphus costse, described 

 by de Natale, 1850, in a letter to Costa, beginning " Carissimo Achille." 



The genus Carcinarnis, A. Costa, is thus defined : — • 



Corpus elongatum, campiressum, darso subcarinatum. Caput antrorsum ad rastri instar conice 

 productum, rostra infra canaliculato. Antennx duo, infra rostrum in canalicida insertx, 

 minutx. Oculi avato-reniformes. Palpi maxillares minutissimi, quadriarticulati, haud 

 fracti. Pedes primi et seeundi paris minuti, validiusculi, prehensites — tertii et quarti 

 fUifomies — quinti, sexti et septimi normales. Pedes spurii primi, seeundi et tertii segmenti 

 abdominalis biremes, remis setosis, setis fimhriatis — quarti, quinti et sexti stylis biarticulatis." 

 The type species, Carcinornis acutirostris, A. Costa, is described as follows : — " C. albus, 

 utrinque vitta Ixte purpurea per totum fere corpus excui-rente notatus ; capite cum rostra 

 tertiam fere tatius corporis partem formante, rostro acmninato ; antennis setaceis ; piedibus 

 tertii et quarti paris subxqualibus — quinti, sexti et septimi longituAine decrescentibus, 

 margine antica minutissime serrulatis, artiado prima madice dilatato; 2Jedibus spmriis 

 quarti, quinti et sexti segmenti abdominalis fere xque terminatis. Longit. millim. 5-6." 

 The second species, Carcinornis inflaticeps, A. Costa, is very briefly described in this way : — 

 " C. capnte inftafo, cum rastro minus acuminato quartum tatius corporis partem formante; 

 coeterum prxcede7iti similis. Longit. millim. 5-6." 



The genus Carcinornis, if reaUy distinct, may eventually be identified by the coloration assigned 

 to the type species. Carcinornis inflaticepjs is suggestive of Oxycephalus typlwides, Claus, 

 from the harbour of Messina, which has been already mentioned (p. 241) for comparison 

 with Ornithoramphus coccoi, de Natale. 



186-1. Grube, a. E. 



Besclireibungen einiger Amphipoden der istrischen Fauna. Archiv fiir Natur- 

 gescHchte. XXX. Jahrgang. I. Bd. 18G4. pp. 195-213. Taf. V. 



He here renames several of the species described by him in 1861 ; see Note on Grube, 1861. 

 He says that the Amphipod, which Spence Bate treats as Rathke's Dexamine tenuicornis, 



