**';.,V'l I'KOCKKDIXGS <»F THK NATloNAI. Ml'SEl'M. 309 



8 Pecten i Vola i dentata Sli\ 



A siii;,'lf valvi- (tin- il.it one). 



I'avta. 



This s|"-. i.-- . vt. r,,u iMiitiiu :i!,i t.i Mouu-rey, California. 



9 Avicula ■tenm (ioiilil. 



Fraj;ment <»t' ouv valv«*. 

 Piiyta. 



10 MytiluB uii(;ulatUB Linn. 



Tlircf ptilV'tt »'xaiij|)k's atitl tnanv txlil \alv«'s. 

 Paciusrnuyo. 



11 Mytihis cuneiformis H\<-. 

 — }f. iiintuftanH* Kant. 



I'riU'ri rxatuplfs ami <>i|il valvt-N. M.ini.i; I'.u'asinayo ; ( iiatliaiu 

 Island. (•alapa;:ns. 



12 MytiluB cuiieiforniis Hv«>., vnri«>ty. 

 Six cxaniploa. 



I*ara.snni.vo. 



13 Modiola cap.ix ('mir.i.l 



One valvt* of a lar;;»' tli.storttMl sprcinu-n I wwhvs Ion;;; al.so the op- 

 posite valve of a small shell 11 inches Ion;;, ohliqiiely in«*asnreil ; one 

 j>erfeef example with epitlernjis intact 1] inclu's Ion;; a;rrees with Car- 

 penter's si»cciiuen8 as well as with the il«'scripti«>n an«l tipnre^. 



I'.iyta. • 



14 Modiola capax Conrnil, varirty. 



Possibly a hybriil lu'lween «((/»</j- aii'l • im, l/'m-niis. ( im- example. 



Payfa. 



15 Area ByHiioarca) pacifica Sliy. 



Oiltl \ alves, from 4i; t<» 2i inches in l»'n;;tli. 

 I'ayta, Manta, ami Kahia. 



16 Aica Bysaoarca) gradata li A >. 



One t'resh valve exiiiliitin;; tlie heautifnl scnlptnie of this speeies to 

 perfection. 

 Manta. 



17 At( .1 HvHio.itc.-i> HoUda .si>y. 



One valve in };o«m1 comlitmn. 

 Payta. 



in AS' 1 All. 1(1.11. 1 fdtMltlUA "^liV 



One lar;;e valve, «llmen,NJon^ 0^ l»y J^ inches. 

 Pavta; Manta i 1 valve . 



