— .'j (^ ;? — 



SulDP-enLis Anrasiun (Bolter.) Schiomacher. 

 Section Amnsium s. s, 



PSGTEK (AI.IUSIUlvI) .^APYRACEUS (Gabb) ? 



Pleiironectia npioyvaoea Gcbb, lO?."^, i'rans. Airi. Philos. 3oe., new 



ser., vol. 15, p. 257. 

 Amusium X)a^:;raoevxa (Gabb) Dall, 1898, Trans. Wap-ner Free Inst. Sci., 



Philadelphia, vol. '^, ^^t. ^, ~r,, vis. 

 Peoten ( Arnus ii-^jn ) pa-n^" r ac eus .Dall, 1838, idem, p. 757. 



Desoription .- "Shell discoirlal, sub-cirf?!!! ar, very slip'htly 

 longer than v/ide; sli~htly inequivalve; ears nearly equal; sur- 

 face per'eotl.y smooth, or raarkecl only by faint lines of gror/th; in- 

 ternal surface marked vvith small double radiating ribc. Length 

 from beak to base 2.2 inch, ?/idth 2 inches." (Gabb, 1875). 



Type locality .- Santo Dominpro. 



Remark's . - l^he collections at hanri contain a small fra,gment 

 of a le.rs-e Amusium and tv.o frasn^-iGntary immature valves. I'he 

 fragment 3ho77S that the ventral portion of the e^-rternal siirface is 

 smooth except for faixit, closely spaced concentric lines; "hile 

 the interior is cculptiired with ^oairei radlals. Both the distatice 

 between the radials that form a pair and that between ad,ioining 



