- 55 - 



of I'atura, Trinidad, are three small valves vfcioh oan soareely 

 be distinguished from young', high Bovrden speciniens; the other, 

 apparently adult, shell appears to he abnormal. ?urther explor- 

 ation of the Trinidad locality may demonstrate the id-entity of the 

 two forms, in which case Guppy's name would he prior. No ade- 

 quate conception of perlepida can be obtained from Gupny's fig- 

 ure. 



Dall (1) has pla-ed in synonymy with vitrea . L. milleri 

 Gabb (2) from the Miocene of Sapote, Costa Hica, but that species 

 is more like the large, elongated forms which Gabb included under 

 his Santo Domingian I. acuta . (3) IIo definite statements can be 

 made concerning Toula's Gatun " Lei a sp . (vielleicht eine neue Art, 

 aff. leda vitrea var. oerata Dall u. Le^.a sublaevis Bell. )" (4) 

 since the figure is poor and the discussion inadequate. It is. 



(1). Trans. 'Tae-ner Free Inst. Sci., Philadelphia, vol. 3, 

 t)t. 4, p. 579, 1898. 



(2). JoxiT. Acad. Hat, 3ci, Philadelphia 2d ser. , vol. 8, p. 

 346, pi. 44, figs. 22, 22a, 1381. (As I'uoularia milleri ) 



(3). See under discussion of I, peltella . 



(4). Jarhb. K.-k. e-eol. Reiehsans'alt, vol. 58, p. 719, lol. 27, 

 fig. 2, 1908. 



however, larger and more inequilateral than sub v i t r e amo rph s. and. 

 in all probability is distinct. 



