Faniil;- Sportel lidce. 

 Genius xU:i30D0I"rA Des' 

 Seotion Basterotic 



Al'^ISODOilTA (3AST:.R0riA) BC . ... Jail. 



Aiiiso<"!onta ( Basterotia ) bo'.'.'cleniana Ball, 1^"0, . ..agner 



Inst. 3ci., Philailelphia, vo" . , : . ", -z. 11??. 



Desoription .- "A species of Basterotia . ^-■-^pears to 



"be clearly inct from B. otiarlrata "inds (1), -presented b^ 



(1), Proo. Zool. ooc. London, p. , lo":5 (as GorTpnla ciiadrata ) ; 

 Reeve, Oonoh. Icon., Oorbiila . ". ", - ■. '; , "•"■". 



a "broken rip-ht valve in the collection made "b" ' ' .■ 



son at Bo'vvden. Hardl;;- conrolete enourli to '" s, it raa;; "be des- 

 cribe' as disting-aished f r -::: ^. gnadrata by the following charac- 

 tftT.?. The keel, ...-^h is "o -^ronirr; 3 in B. . '•? . 



in the present shelJ- is well niax-ked onlj" on tho beal', rapidly. 

 becoming obsolete distally and represented only bj" a roimded 

 ::i _, .:.!,;„ passes iMwP-pp-.-^i'oi - ■'^■n^-,■^ ' ■] -n-'ivezit^' of 



'he valve. 2he beaks in _2« oov- '^eiiU.na ' angular aj"id ele- 



vated, the shell thlnnc- more ovate, the hin-^e-line longer, 



t'iie elevated tooth smaller in proportion to ^^' - "'ell cuitl Lu^ch 



