214 JOURNAL OF COiNCHOLOGY, AOL. lO, NO. 7, Jl'LY, I9O2. 



The large heavy Placostylus, which I will call the true Placostylus^ 

 seems to be confined solely to New Caledonia and the Loyalty Islands, 

 which are, comparatively speaking, new, although the species from 

 New Zealand and Lord Howe Island approach them very closely, and 

 may possibly have been introduced from New Caledonia. 



The species from the Fiji Islands and Solomon Islands are, to my 

 mind, very distinct from those of New Caledonia, and I should be 

 inclined to separate them and put them into a section by themselves. 

 The tree-loving Chans I should also raise to a section. In any event, 

 their common ancestor must have been very remote. New Caledonia 

 I think shows by its shell that it must have been separated from the 

 other islands from a very remote period. 



TWO POINTS IN NOMENCLATURE. 



By WILLIAM E. IIOVLE. 



(Read before the Society, June 11, 1902). 



I. — Cypriniadea versus Cyprina. 

 In reply to Mr. Newton's Note read before the last meeting of the 

 Society it seems desirable to make the following observations in 

 justification of the procedure adopted by the Committee The 

 generic name used by Linnaeus for a fish was not Cyprina but 

 Cyprinus. In order to ascertain whether these are mutually exclusive 

 we refer to the Rules of Zoological Nomenclature and find that names 

 which are etymologically alike and differ only in their spelling are to 

 be rejected. Cyprinus is clearly the Latinized form of KUTrptros, the 

 name of a fish used by Aristotle, whilst Cyprina is a diminutive of 

 RVTrpis, a name of Aphrodite (see "Agassiz, Nomencl. Zool.," Moll., p. 28), 

 hence the two names are allowable. Furthermore it is expressly 

 stated in the rules laid down by the German Zoological Society for 

 the guidance of the naturalists engaged in preparing " Das Tierreich" 

 that Picns and Pica are both permissible, though zoologists are advised 

 to refrain from coining names so much alike in the future. The 

 Committee have to acknowledge the assistance of Dr. F. von Maehren- 

 thal in elucidating this question. 



II. — The Genus Antiopa. 

 The generic name Antiopa seems to have been used for Diptera by 

 Meigen in 1800, and therefore cannot be properly used for Nudi- 

 branchia as suggested by Alder and Hancock. The name Antiopella 

 is therefore proposed in place of the latter. 



