A^-] _ 



pyana (l) is smaller, "less ir '"" ate ral, ■ more inxla'- " , Ith a 

 larger and more sharply limited lunule. P. oir , ' .orzi) (2) 



(1). Jour. Aoad . J-^at. 3ci., Philadel'Dhia, 2nd ser., vol. n^ 



--p. ?7^-?74, pi. 47, fig;.. 75 (as Jarrratis -up^yena l 



(2), Ivlus. Oaes. Yind. lest., p. :i, pi. 4, fig. 8, 1780 (as 

 Yeniis Gir^inata ) = C):;therea jiTncea Crup -.y, Cuar''. ""-Tir. 

 ■?eol. 3oc. lonrlon, vol. 22, fi-'S. 15^, 1866. 



ranging from the Oligocene to the ?.ecent in the OarilD-oean and 

 Oentral Anierioan regions is smallc r, more roiindcd, hi^-hcr, more 

 convex, v/ith more prominent umhories and fjoriev.'hat lamellose acr-lp- 

 t -re. It Y/ould he virtually inipossilDle to disting ' etv;een 



~orn valves of 'ilanivieta and those of ^'acrocallista macr.lata 

 {Iin::a:as) (S). 



(7). 3y?^t. ''at., e^. 10, --i. SOS, 1753 fas Venns macnlata ) . 



Guppy (4) noted that his figured s;ieci- en is slightly dis- 

 torted; the in'oho shmTl-"' he more inerrved, the posterior n more 



(1). '.--:. ''\':., 1876. 



rounded, the posterior carina closer to the YerA: " in and 



the shell in general more inflated. 



Occurrence .- ';per Oligocene: to Domii. aVo , IB??; 



