6 CARL BOVALLIUS, THE OXYCEPHALIDS. 



In 1864 ACHILLE COSTA, 21, without referring to the genus Oxyce- 

 phalus or to the family Oxycephalidae, instituted a kind of subfamily, 

 Ornithoramphini, for the reception of the genus Ornithoramphus, NATALE, 

 and the two new genera Natalius and Carcinornis. On the synonymy 

 of the first genus see above p. 3, the genus Natalius is probably syno- 

 nymous with Oxycephalus, and the new species N. candidissimus, pos- 

 sibly is 0. piscator, H. MILNE EDWARDS; the genus Carcinornis is diffi- 

 cult to identify, it comes perhaps near to Streetsia, STEERING, orLep- 

 tocotis, STREETS, because the form of the first two pairs of pera3Opoda 

 alluded to in the diagnosis is most similar to the form of those pairs in the 

 two mentioned genera; of this latter genus Carcinornis he established two 

 new species C. acutirostris, and C. inftaticeps; the suggestion of STEERING 

 1. c. p. 347 that the latter may prove to be synonymous to Oxycephalus 

 typhoides, GLAUS, is, according to my opinion, not supported by the few 

 characteristics given by COSTA; see below under Stre etsia. 



In 1867 COSTA, 22, mentioned Ornithoramphus Coccoi, NATALE, among 

 a collection of Mediterranean crustaceans sent to the exhibition in 

 Paris that year. 



In 1871 C. CLAUS, 23, gave some short notices on the anatomy of 

 the Oxycephalids, mentioning a vesicular organ in the hind part of the 

 head; this vesicle he regarded as an auditory organ; he described further 

 the structure of the eyes, the nervous system, and the organs of circula- 

 tion. At the same time he gave a new diagnosis of the genus Oxyce- 

 phalus, and described as 0. piscator, H. MILNE EDWARDS, the animal which 

 here below is named 0. Clausi, he argued further that 0. oceanicus, 

 GUERIN, is synonymous with 0. piscator, H. MILNE EDWARDS, a fact 

 which GUERIN-MENEVILLE already in 1841, himself had proved, 8, and that 



21. ACHILLE COSTA. Di alcuni crostacei degli acalefi, e di un distomideo para- 



sitto. Rendiconto delPAccademia delle Scienze Fisiche e Mate- 

 matiche. Anno 3 ro . Fas 4 to , p. 8689. Napoli, 1864. 



22. ACHILLE COSTA. Saggio della collezione de 1 Crostacei del Mediterraneo Del 



Museo Zoologico della University di Napoli spedito alia Espo- 

 sizione di Parigi del 1867. Annuario del Museo Zoologico della 

 R. University di Napoli. Anno 4 to , p. 44. Napoli, 1867. 



28. C. CLAUS. Untersuchungen fiber defl Ban mid die Verwandschaft der Hype- 

 riden. Nachrichten von der K. Gesellschaft der Wissenschaften 

 und der Georg-Augusts-Universitat aus dem Jahre 1871, p. 149 

 157. Gottingen, 1871. 



