THK NAUTILUS. 

 NOTE ON PACHYCHEILUS VIOLACEUS PRESTON. 



BY CHARLES T. RAMSDEN, 

 Guautanamo, Cuba. 



This species, the largest Mehinian of Cuba, was described by Mr. 

 Preston in the Proceedings of the Malacological Society of London, 

 ix, p. 199, March, 1911, the locality being indefinitely given as 

 " Cuba, alt. 2000 feet." The circumstances of the discovery of this 

 remarkable species may be of interest. I found it in the Santa Maria 

 river at Camp Yberia, 2000 feet above sea level, on September 17th, 

 1909. This place is 25 miles west of the city of Baracoa, on the 

 north coast of Cuba. The hills in which Camp Yberia lies are 

 known as the Sierra del Cupey, and the place is by no means easy 

 of access. 



The shells are quite abundant, all being squarely truncated. They 

 are purplish-brown, almost black, with indistinct light bands below 

 the suture, at the periphery and around the axis. These bands show 

 distinctly on looking through the shell from the inside. Or the shell 

 might be described as pale olive, with two broad purple-brown bands- 

 The surface has the fine striation of the Central American species of 

 Pachycheilus. 



THE USE OF THE GENERIC NAMES UNIO, MARGARITANA, LYMNIUM 

 AND ELLIPTIC, AND OF ANODONTA AND ANODONTITES. 



BY A. E. ORTMANN. 



Recently an attempt has been made to show that the general use 

 of the old names of Unio, Margaritana and Anodonta is not correct, 

 but that they should give way to Lymnium, Unio and Anodontites, 

 respectively. This was first indicated by Thiele (Nachr. Bl. deutsch. 

 Malakozool. Ges. 41, Heft 1, 1909, p. 29) and carried out by him 

 subsequently (J. Thiele, Mollusken, in: Brauer, Suesswasserfauna 

 Deutschlands, Heft 19, 19< 9, pp. 32-35). 



I. To the first change (Unio into Lymnium, etc.) an objection was 

 promptly taken by F. Haas (Nachr. Bl. deutsch. Malakozool. Ges. 

 41, Heft 2, 1909, pp. 68-72), to which, however, Thiele replied, 

 maintaining his view (Beitr. Kenntn. mitteleurop. Najaden, Beil. 

 Nachr. Bl., etc., No. 3, 1909, p. 48). 



