EEPORT ON THE AMPHTPODA. 239 



It will be seen iu the note on Cocco, 1832, that in that year Cocco mentions a species which he 

 calls Chiropristis litorea, but I can nowhere find allusion to any description of either the 

 genus or the species, and am at length forced to conclude that Cocco never published any. 

 In this case CJieiropristis messanensis should be cited with de Natale's name both for genus 

 and species. It is not easy to see what de Natale means by saying that the posterior extremity 

 of the tail is without appendages in Typltis, while he affirms that in Cherrajmnfis the tail 

 has appendages. Typhis has in fact three pairs of uropods, whereas he represents his 

 Cl)eiropristis messanends with only one pair. His statement that the abdomen of Cheiro- 

 pristis has only two joints, of which one is rudimentary, can scarcely be trusted, and 

 indeed does not agree with the figure, in which at least two fully-developed pleon segments 

 are shown and a third not obscurely indicated. In the B. M. Catal., p. 325, under 

 Anchylomera sedentaria, the Phronima sedentaria of Costa, Spence Bate say, " I am 

 inclined to think that Cheiropristis Messanensis of Cocco belongs to this genus and 

 probably to this species." In agreement with this opinion I consider the species to be 

 AnchyJomei-u messanensis, de Natale, in the subfamily Phrosininse. In comparing de 

 Natale's description with others relating to species in the same genus, allowance must be 

 made for the fact that he obviously took only a lateral view of his specimen, without dis- 

 section. In such a view, I know from experience that the broad fourth joint in the large 

 third perfeopods of Anchylomera may appear narrow, and that a telson in reality rounded 

 may seem to be lanceolate. His attempt to disentangle the limbs without breaking them, 

 may well excite the commiseration which he invites, since he had evidently not thought of 

 the expedient of separating them from the body of tlie animal. 



Of Orio zancleus, Cocco, de Natale says that MUne-Edwards judged inconsiderately in saying 

 that it did not appear to differ from Typhis. Besides the characters here derived from a 

 single damaged specimen in spirits, he gives a fuller account in the appendix. 



He institutes a new genus to receive " Ornithorampihus Coccoi," figured Tav. 1. fig. 3. This, 

 though he calls it a new Crustacean, had been long before described by Cocco as 

 " Orio Ornithorampihus" with some doubt whether it should not be put in a separate genus. 

 Of the necessity of this do Natale was convinced, but was somewhat doubtful whether 

 it might not belong rather to the Isopoda than to the Amphipoda Hyperina. He describes 

 it thus : — 



"Esso si presenta d'una forma allungata e rotondetta. II capo, convesso aU'orlo superiore, 

 finisce in avanti a modo di becco d'uccello ; apparenza tanto piii curiosa, in quanto che 

 porta ai lati della sporgenza rostriforme, un solco che simula una specie di commissura. 

 Gli ocohi son piccolissimi, quasi invisibili, e segnati solo da due punti nerastri per ciascun 

 lato del capo. I palpi mascellari gracilissimi ad articuli indistinti I piedi mascellari cou 

 un'articolo basilare grosso e piriforme, che porta in fine tre filiformi articoli lunghissimi, 

 fratti e piegati su di sfe in un solco longitudinale inferiore del capo ; una strozzatura separa 

 il capo dal coUo. Dal primo anello toracico, ed inferiormente, sembrano che prendessero 

 inserzione i piedi mascellari, che son corji, tozzi, robusti, ineguali, ad articoli stretti e 

 corti, di cui I'ultimo porta una vera mano cheliforme. Simile chela termina pure i piedi 

 toracici del primo pajo, di cui il primo articolo h lungo, stretto, lineare ; ma I'ultimo 

 robusto, dilatato e terminato da mobile gancetto. Tutte le altre sei paja di piedi seguenti, 

 in generale, tranne una varia lunghezza di esse, e degli articoli che le costituiscono, sono 

 identiche. II lor primo articolo e dilatato, foliaceo, diafano ; i seguenti stretti, allungati 

 simili a palpi, frangiati di peli agli orli. II primo pajo tra esse e il piti lungo, quindi 

 vanno gradatamente decrescendo di lunghezza, fin I'ultimo che h cortissimo e con tre soli 

 articoli lineari. I sette anelli toracici son quasi simili, della stessa altezza del capo. 

 L'addome si compone di tre anelli ben conformati e distinti, ma I'ultimo porta inferiormente 

 due lamelle vibratili, diafane, che si piegano I'una sull'altra come valve. — Queste lamelle 



