LCAin ii' 



III 



carh with :i .-mall .viitral j un in li- 



dc, triangular and olo 



A. PYOII i i - I'ti . PI. i:;. fur-. 58, 59. 



Small, oliloiiir, elevated, rarina slopes fla 



ereain-u hitc of olivr-^rt 



Intermediate valvr- l.n.a.l, -..mcwhat leaked !><,, 8/OfMU 

 tri'tti'/n/tir, sculptured with longitudinal .-t. I nil areas 



evenly covered with rather large flattened pustules, which are 

 rounded or hut slightly ovate, and average one-t- i mill, in 



teat diameter, Posterior valvi havim: th- .mnval.v 



than lon^ ; inucro prominent, .-nl><vnt ral. 



Interior hlue or flesh white. Posterior valve nearly semicircular 

 in outline hehind, having a slit on each side, and a very slight 

 upward wavr In-hind. The insertion-plate is short In-hind. 



Girdle narrow, havini: !> small tufts of silver-whip 

 each side, and an irregular fringe at the edge. 



Length 8, hreadth 4 mill. ; divergence 100. 



Cedar Keys and K \ II iill.) 



This is the smallest species of the genus known to me. It differs 

 from .1. .-yy/V/'/ox/'x in the smaller size, and hiirh, roof-like form, in the 

 smaller tnfts, comparatively much longer tegment a, and in thr shape 

 of the pustules, which are as coarse as in gpi although 



shell is so miic'li smaller. The posterior valve difll-is widely : 

 that ni' f/iirn/osns. 

 A. EXQUI8PTU8 rilshry, n. sp. 1M. 12, figs. M, 45, 16, 17. 



Ohlong, the visible portion )' tin- / j-enerally lees 



than one-fourth the entire width of the dried animal ; depressed. 

 Valves dark olive color; girdle of dried specimen- li-ht \ 

 tuft* very Inryu and either L r i'ern, pink or hnuize Colored. In I 

 preserved alcoholic specimens the girdle is very fleshy and i 

 liirht vellow with irrern puhescence. 



The median valves are hut slightly beaked, tin- tegmeotam ? 



narrow, its area far lets tlmn tlmf of one of th> 

 luni'nui . Dorsal area a rat her narrow, longitudinally striated !: 

 wider in front. Sid- an -a.- narrow, -ciilptured with -epai; 



topped gran ales, round posteriorly, ovate 01 drop-shaped and 

 cave toward the anterior of eaoli ?al :>o^ed pof 



iterioi- valve much -Imrti-r than the : 



