500 H. A. Pilshry — Air-hreathiug Mollusks of the Bermudas. 



Poecilozonites nelsoni (Bid.). 



Hyalina nelsoni Bid., Ann, Lye. N. H. of N. Y., xi, 1875, p. 78. 



P. nelsoni Pilsbry, Proc. A. N. S., Philad., 1888, p. 290, pi. xvii, f. J, K, L. 



P. nelsoni Y. Mart., Sitzungsber. Ges. Nat. Freunde, Berlin, 1889, p. 201. 



This species was found' by Mr. T. M. Jones in the "stalagmitic 

 conglomerates in caverns at Tucker's Town." Professor Heilprin 

 procured specimens from the same locality, and probably Beyrich's 

 specimens, recorded by Von Martens, were from the same place. 



It occurs at numerous localities imbedded in the softer geolian lime- 

 stone, often in large numbers. At Bailey's Bay Island I obtained 

 specimens from a ledge exposed only at low tide. — (A. E. V.) 



Bland's type measured alt. 19,* diameters 37 x 34°^™. Four speci- 

 mens before me measure: alt. 21|^, diam. 33; alt. 26, diam. 40 ; alt. 

 30, diam. 33 ; and alt. 30, diam. 30""™. The last three are exception- 

 ally coarse in sculpture, almost or entirely free from carination at 

 the periphery, and have about 9 whorls. 



Rarely a specimen of P. bermndensis is found with much the con- 

 tour of the more elevated forms of P. iielsofii. 



Poecilozonites reinianus (Pfr.). 



Helix reiniana Pfeiffer, Malak. Bl., xi, 1863, p. 1. 



Pilsbry, 1. c., p. 290, pi. xvii, f. I, 1888. Also 1889, p. 85, pi. iii, f. 12, 13 (var. 

 goodei). 



This species is more broadly umbilicated than P. circiimfirmatus^ 

 and has no internal lamina. The variety goodei Pils. has a still 

 wider umbilicus and is quite flat above. 



This species was not found by our party. Our specimens were 

 presented to us by Miss A. Peniston. — (V.) 



Pcecilozonites circunifirmatus (Redf.). 



Helix circumfirmata Redfield, Ann. Lye. N. H. of N. Y., vi, p. 16. 

 Pilsbry, Proc. Acad. N. S., Phil, 1888, p. 291, pi. xvii, f. F, G, H. 

 Helix discrepans Pfr., Malak. Bl., 1864, p. 1. 

 ? Helix ptychoides Prime, Bermuda Almanac, 1852 {nomen nudum). 



Plate LXfT, Figures 9, 9a. 



Peculiar by the lamina within, reminiscent of the allied genus 

 Gastrodonta. It varies from the thick typical form to a depressed 



' The alt. was probably measured by Pfeiffer's method, which is more correctly the 

 length of the central axis, not of the whole shell. 



