140 THE NAUTILUS. 



7. Plearodonte acuta (Lam.) is found throughout the southern 

 Parishes of St. Elizabeth, Manchester, Clarendon and St. Catherine; 

 though in some localities slightly specialized forms occur, I have not 

 yet been able to arrange them satisfactorily. As a rule the speci- 

 mens from the higher kinds are larger and with small teeth, some- 

 times only one tooth, whilst the coast and lowland forms are very 

 small, and have large teeth. 1 The variety aculissima is not a local 

 race, for in almost every locality of say three or four miles in extent 

 it usually turns up as an acutely carina ted form of the local variety. 



7 A. Pleurodorde acuta (Lam.). The variety julia occurs on the 

 hills near the sea on the northern coast. Acutely carina ted shells 

 with depressed spire are frequently found amongst the common and 

 typical forms. This variety julia may ultimately prove to be the 

 lowland variety of P. patina — not of P. acuta. 



7 B. Pleurodonte acuta, var. lucerna (Mull.). 2 The most pro- 

 nounced forms are found on the coast hills of Westmoreland. 

 Further inland occur larger specimens with smaller teeth, and the 

 aperture of the shell much wider. Prof. C. B. Adams' fuscolabris is 

 a color variety. 



7 C. Pleurodonle acuta var. sublucerna (Pilsbry) occurs in the 

 lowlands of St. Catherine and along the coast hills of St. Andrew. 

 Near Yallahs there is a very small depressed shell with very large 

 teeth and the umbilicus uncovered. Prof. C. B. Adams mistook 

 this shell for P. lucerna of Muller, and so named it in his collection 

 at Amherst College ; so when he had the Westmoreland specimens 

 brought to him he described them as new under the name of fusco- 

 labris. On the northeast slopes of the John Crow Hills, especially at 

 Quaw Hill, a very large form of this umbilicated shell is found. 



8. Pleurodonte bainbridgei (Pfr.) (No. 8 in map), occurs only in 

 the neighborhood of Ulster Spring in Trelawny. It is distinguished 

 by having the spire very much depressed. 



9. Pleurodonte pretiosa (C. B. Ad.) is very widely distributed, 

 being abundant in Manchester (No. 9 on map), and spreading east- 

 ward. It is difficult to give any eastern boundaries of this shell, as 



'Specimens of P. acuta were taken rear Hope Bay, on the north coast in 

 Portland parish, by C. W. Johnson and W. J. Fox, in 1891. — Eds. 



'If P. acuta and lucerna are to be united, the latter will be the species, the 

 former the variety, as If. acuta was described nearly fifty years later than H. 

 lucerna. — Eds. 



