Palceozoic Fossil. 37J 



this point, but it is certainly inclined towards tlu- beak of the 

 pedicle valve and not vertical The surface of the internal cast is 

 smooth, but on either side of the beak there are close-set striations 

 where the diductor muscles were attached. The beak and 

 shoulders of a verj' large specimen of this species on the same slab 

 shows these sti'iations on the beak very well, but there are no 

 ovarian pittings on the shoulders. The ribbed portion of this 

 specimen has been broken away, yet the appearance of the cast 

 dififers in no way from the cast of Sjj.orhignyi adjacent except in 

 size. Reed'H Sjjirifef ( R<4icu/(iriu /J sjj. h* is the same as this 

 broken cast, and 1 believe that his specimen is a worn portion of 

 a large Sp. orhiynyi. In yet another fragment showing only the 

 beak, the end of the cast of this is preserved, showing the cleft at 

 the extremity, and while the sti-iations of the diductor muscle 

 scars are clear and distinct, I can see no sign of the adductor scars; 

 the ribs of the shell have also left an impression in the cast of the 

 beak. 



Affinities : — Spii'ifer duodenan'tis, Hall, Oriskany [Sandstone, 

 seems to my mind to stand nearest to this species. 



Cat. No. 2l2fi. Donor : Dr. W. G. Atherstone, marked Mon- 

 tagu, i<s8y. 



Cat. No. 2(jt)i. Donor : Geological Commission. Locality, north 

 of Uitkomst homestead, Ceres. Many specimens of Sp. (intarcticas 

 with it. 



Cat. No. 80. Donor : Mr. A. G. Bain. Locality, H arm Bokke- 



veld. A few of the casts have the beak strongly bent back and 



the mesial furrow in the dorsal valve constricted towards the 



centre ; these features, besides the more semicircular form, enable 



one to pick out the Sp. (ni)iynyi from tiie multitude of specimens 



of Sp. autdrcLicua. 



Spirifer atiturcticus, Morris and Sharpe. 



PI. VIL, Figs. 1, 2. 



. ^ , ._, j Spii'ifer inacrupterus, Goldfuss. 

 '" ( Spirifer speciosus, ISchlotheim. 



D'Archiac and de Verneuil, Trans. Geol. Soe. J^on- 

 don (2) VI., i>. ;')S1. 

 *Anu. S.A. Mixs, IV., p. ltS5, PI. XXIII., fig. 4. 



