- ?15 - 



I?a:ailT/ iJonacidae. 

 r'^enus. DOrAX (Linnaeus) Earcarck. 



DOV.AX L^rrozi n. sp. 



Donax aeoualis Dall, ig^O, "'r- v--. -Tr^r— pr "^ree Inst. Sci., 'Phila- 

 delphia, vol. r, p::. 5, p. 9o6, (ex parte, non c^ebb, 

 1875). 



Description .- Shell small ,_.,-t hi n, su.btrojisluoent , moderr'tely 

 inflated, tnoderately inequilateral; antero-dorsal niar-'in Ions?, 

 strai^^ht, ■^he 'interior en"' -^o^-i^.- . r-nuJ:o v-n_ -n -.-'--t ■^'ar^.-in alisrhtly 

 convex, ti.e posterior end produce i and abtuptl^- rouiided "bel-ow; 

 base slightly- arcuate; posterior carina prominent, subrounded, the 

 posterior sItv-^- almost flatterjer"; ■f^hp f^-^-^rf^-r^ ^ „ \ rr pt ner^r the 

 umbo, bearing distinct, fine radial , standing in relief 



onl;" on \7orn s;irfac!es; left valve with wealc laterals, received 

 into vrell-marked sockets on the rip-ht valve; inner ventral '-r- 

 gin of the valve '//ith fine erenulations, extendizig' up a short 

 distai'Lce on the posterior margin; pallial line obsciire. 



Sinension s.- Length, 5 mm.; alt., r. nni. ; semir'.iam., "^ r'-,. 



Remarks . - fragmentary valve is slightly larr^-er than 



the tyoe. The rarlial markinr:: are distinct, but do not consti- 

 tute striations ezceot v/here the sra-iace is eroded. This species 



