PLATE XXX] X. 



(lONIOPIIORA PERANGULATA (page 299). 



Figure 1. 8ide \ iew of the most perfect specimen collected, a nearly 

 perfect cast of the interior of both valves, from a 

 small island off Whiteaves Point, Dawson Bay, 

 shewing the right valve. 



Figure l<i.. Front view of n specimen from the western shore of Daw- 

 .son -Bay, near the mouth <jf 8teep Rock River, in 

 outline, to shew the amount of com e,x:ity of the two 

 valves. 



MAOIfODON' PYGM.EUS (page 299). 

 Figure li. Cast (if the interio)- of ib left valve, fnmi the western shdre of 



Dawson Bay, at the mouth of Steep Rock River. 

 Figure •">. Cast of the intericjr nf the right valve of a specimen from 



Devils Point, Lake Winnipegnsis. 



NuruLiTES. Sp. (page 302). 

 Figure 4. The "imperfei.'t oast of the interior <jf a single valve " from the 



north side of Manitoba Island, referred to in the 



text, twice the natural size. 

 Paracyclas. iSp. Undt. (page 306). 

 Figure -^i. Side view of the wax impression of ii natural mould of the 



exterior of the closed valves from the first small 



point north of the mouth of the Red Deei' River, in 



Dawscjn Bay, referred to in the text, shewing the 



right valve. 

 FigTjre 5«. Dorsal view of the same, in outline, to shew the proportionate 



convexity of the two valves. 

 Pai!A('vclas ANTKiUA (page 304). 

 Figure 0. Hide view of a wax impression of a natural mould of the ex- 



ter-ior of the shi41 from the south-west shcire of 



Dawson Bay, near the mouth of !Stee]i Rock River, 



shewing the right valve. 



PAI!AC'^■CLAS HLI.IP'l'HJA, Va?'. OCOIDKNTALIS (page ■■SQ")). 



Figuie 7. Specimen, which is believed to be (|uitefree from distortion or 

 coiiipiessicjii, from the s<juthern shore of Dawson 

 ]!ay,at a suiall point about a mile east of Bell River. 



Figui'e 8. Oiiginal diawing of the type of Luriini nrciilrii/ii/i.i, B,illings, 

 from Snake Island, Lake Winnipegosis. 



Figure 9. Side \iew of a specimen from the Red l)ei'r River, which has 

 been fibliquely distoi'ted. 



Figure 10. Side view of another- s)iecimen from the l{ed Deer Ri^cr, in 

 which the abnormal <ompr-ession, in the direction of 

 the height, has icached its maximum. 



