78 CANADIAN MICRO-PALEONTOLOGY. 



6. Beyriceiia TUBERCCJLATA (Kloedeii). Yar. N"oetlingi (Reuter). 



PI. 11, figs. 4 a, 4 b, 5. 



Beyrichia Noetlingi, Reuter. Zeitschs. d. D. g. Ges-, vol. XXXVII, 1885, p. 637, 



pi. XXV, figs. 5, A, 5 B. 



Fig. 4, length 3-0 (hinge-lino 2 -7), height 1*8, thickness of carapace 

 1-5 mm. 



Fig. 5, length 4-3 (hinge-line 4-2), height 2*5 mm. 



Fig. 4 is nearest to B. Noetlingi^ Reatei*, op. cit., fig. 5- A, in which 

 the tubercles representing the gigot lobe are separate and form two 

 rows. In fig. 4, however, the outer two tubercles coalesce, and are not 

 divided. 



In fig. 5 the tubercles constituting the gigot are evidently in two 

 rows, but are not deeply divided one from the other. This specimen, 

 also, seems to have had a supernumerary lobule (broken off) at the 

 antero-dorsal angle, and its raid lobe shows a slight constriction at top. 



From Stonehouse Brook, Arisaig, Nova Scotia, in the same lime- 

 stone as the foregoing ; also from McAdam's Brook, in the sandstone 

 previously mentioned. 



7. ISOCHILINA GRANDIS, Jones. Var. LATIMARGINATA (nov). 



PI. 10, figs. 1 a, b and c, 2 a, b and c, and 3, 4. 



Leperditia marginata, Keyserling (?), Jones. Ann. Mag. Nat. Hist , ser. 2, vol. 



XVII, 1856, pp. 94 and 100, pi. vii, figs. 14 a-d. 

 Isochilina grandis, Schrenk, Jones. Op. cit., ser. 5, vol. VIII, 1881, p. 347. 

 Isochilina grandis, Jones. Op. cit, vol. IX, 1882, p. 171. 



Mm. Mm. Mm. Mm. 



fi u?ed— Ten^th }^^ (hinge-line. . .19), height. .18, thicknes of carapace . . 10 



Fig. 1— Length 11 ( 15), ..13, 8 



Fig. 2— Length 14 ( 10), •• 8, 6 



Fig. 14 (1856) Length 18 ( 13), . .11*, 7 



Carapace valves obliquely suboval, or, rather, ovate-oblong ; con- 

 vexity greatest in the anterior moiety, and lessening gradually back- 

 wards, but suddenly depressed at the anterior and ventral margins to 

 form a flat marginal rim, which continues to the ends of the dorsal 

 border; straight above, along the hinge-line, which is about two-thirds 

 of the length of the valve, with its terminal angles well defined ; ellip- 



