﻿178 I.AMPSII.IS 



Lamf^siUs fmbriata Fkuckson, Naut. XXT. Kp/, p. 86, pi. xii, 

 two u])pc'r tij4nrc's and lower left-hand fi.yure. 



Paraptcra (?) fimbr'mta Oktmann, Ann. Car. Miis., VIII, 

 1912, p. 332. 



Lamfsilis solinasnisis Simpson, TV. U. S. Nat. Mus. XXXV, 



1908. p. 181. pi. XXX, f\^. 3. 



"The shell is not related very closely to any species that I 

 know of. In fact I am nndctennined whether to place it in 

 J.atnpsilis or in Nephronaias. In the absence of any data re- 

 garding the animal, it is provisionally placed in LampsUis. The 

 prismatic layer is 3-16 inch wide at the edge in some cases. 

 This peculiarity accounts for the pitting, and numerous irreg- 

 ular sulcations being, it is evident, not normal, but the result of 

 numerous accidents, which befall the extremely delicate edge 

 of the shell. The two upper figures represent the type speci- 

 men ; the lower left-hand figure is a young shell." 



Lampsii.i.s .\i.ienigena (Crosse and Fischer). 



Shell evenly long elliptical, subinflated, solid, with a very 

 low, somewhat double posterior ridge, which ends behind in a 

 slight biangulation at the median line ; with a very imperfectly 

 developed wing ; ligament large ; epidermis brilliant brown-olive 

 with very feeble rays ; beaks moderately full, a])parently not 

 high ; hinge rather delicate ; left valve with two compressed, 

 ragged pseudocardinals and two long laterals ; right valve with 

 two pseudocardinals, the upper smaller and one long lateral ; 

 muscle impressions shallow ; nacre rose-color. 



Length 82, height 51, diam. 30 mm. 



Goatzalcoalcos, Vera Cruz, Mexico. 

 Umo alicnigemis Crosse and Fischer. Jl. de Conch., XLI, 



1893, p. 294. — Fischer and Crosse, Miss. Sci., II, 1894, p. 



590, pi. Lxv, figs. 5, 5a : pi. Lxvi, fig. 3. — VON Martens, 



Biol. Cent. Am. Moll., 1900. p. 513, pi. xxxv, fig. 2-20. 

 Lainpsilis alirnigcnns Simpson, Syu.. kjoo, p. 572. 



I have onlv seen a young male specimen of what I refer to 

 this species with doubt, and this is considerably decorticated. 



