Geuus I>1A.OO!!A Leach. 

 Sxxbgemis Psaminacoma ' Dall. 

 Section Psararnacoraa s. s. 



MACOliA (PoAiiaiAOdji) ^.^^J^A - 11. 



I.'Iacoma (Psaiarnacoma) traota Dall, 1900, Trans. V/ajrner T'ree Inst. 

 Sei,, Philadel-ohia, vol. I?, -nt. 5, p. 105?, nl. 47, 

 fig. 13. 



Pe script ion .- "Shell snail, tii in, rather comcressoci, , elonr- 

 ate'l, inec iiila.tcr al, the anterior end longer; o&a.is lov/, not con- 

 spiGuoas ; posterior end slightl^' flexed to the rifht; anterior 

 end his-her, rounded, -oostcrior attenuated, iDlimtly terminated; 

 surface oniooth except for faint incremental lines; iiit-rior ( in- 

 acGessihle in the specimens). Ion. 12.7, alt. 5, diam. P- Gim." 



"This sr^all species differs frora the ^:onnp- of the ne-t 

 I IT. olivella DallJ in its more at -enuated posterior enc; and 

 slight flexure." (Dall, 1900). 



Trre 1 oo al 1 1:; . - '3 or d • n , Jaria lea. 



-weraarhs .- A single lar^re loit valve is riresent; it has the 

 followins- dimensions: length, H2 ram., alt., 10 mm.; diam. about 

 2.5 ^ir;i. The s^irface of the shell is not -oerceptibl;)- fle::e''l -oont- 

 eriorly. As in the case of the Y.atioa&l r.useum specimens the 

 interior is not accessible. The discover:; of so larpe a valve 



