^ O '"*, 



ree-ent f amm , "but b? s a different hiiige." 



T;/pe local i t_v . _ B ow d en , Jam ai ca . 



"\eTTiarlrs «- The . ./_- - .,j of this s-^en-'fis, the t^'^p ^f the siil)- 

 geniTS are abiuidaait , Taut, as v;ith thie otl'^r Ju8-oidarif. , all of the 

 specimens are from the Aldrich eolleetion. Drll (1) Pave the follow 

 ing -"liapiiosis of the RuhTomis : "Sculpture like ^!prr!i om^'g ; hinpe 



(1). loG. cit., p. 1504, 1905. 



vath a posterior left and anterior right cardinal, the resilium 

 "between them, but no laterals; the raarp-ins of -the right valire 

 ^.-roovr. (=!^ 1-0 receive the e:T[. _.. ,._' the valve o-or,o?^ltr. 'a -^Vo right 

 valves .at hand, however,- there is a very prominexit posterior card- 

 inal and the edge of the mar.rin immediately behind the chondro- 

 phore i8 ■.i-r,ini;ne''' en-'i- '^>1.^>ened for a short dis'-ance so ^^s "^^o 

 produce aii incipient anterior oarcTinal ; on the left valve the hinge 

 line is ahru-ntl: arched post eri oris? to receive the posterior right 

 cardinal, vfeile "behind this emargination the •-■:•-'■ ^:V,i r-'Vpr.rrT 



- -d produce'"": to form a weak posterior cardinal. Jhe doy^l mar -ins 

 of the right valve are grooved, the posterior raoi'e deeply than the 

 anterior. Tae largest valve has the followin" "'I -^"sions ; ■'^-r-^Tn^ 

 4 mm.; alt., 3.S rara. ; diam. , g mm. 



0_. fX'USonia) monosteir:. , occurring' o-^f "^■--■^■■i, -i- r-i.-f-Vo^Tf- 

 laterals or left cardinals, the right valve having an anterior 



