82 CANADIAN MICRO-PALEONTOLOGY. 



by Mr. Whiteaves for comparison. This is a cream-coloured limestone, 

 and lies immediately on and conformable to the Nia^^ara Limestone. 



Another Leperditia, associated with the foregoing, seems to be a 

 variety of Jj. 2^^<^s€oli(s (Hisinger). See further on, page 8b'. 



9. JjEPEaDiTiA HisiNGERi, Schmidt. 



PL 13, figs. ] and 9. 



10. Varietas fabulina, Nov. 



PL 10, figs. 5 and 7; pL 12, figs. 15 ; pi. 13, figs. 2, 3 and 5. 



11. Yar. GiBBERA, Nov. 



PL 13, fig. 4. 



12. Yar. egena, Nov. 



PL 12, fig. 8. 



Cytherina balthica (part), Hisinger. Letlmea Succica, 1837, p. 80, fig. 1. 

 Leperditia balthica (part), Jones. Ann. Mag. Nat. Hist- ser. 2, vol. XYII, 1836, p. 



85, pi. vi, figs. 3 a-e. 

 Leperditia balthica, var. b. Kolmodin. Bidrag till Kannedomen om Sveriges 



Siluriska Ostracoder, 1869, p. 14, figs. 4, 5. 

 Leperditia Hisingeri, Schmidt. Mem. Acaci. Imp., St Petersbourg, ser. 7, vol. 



XXXI, No. 2, 1873, p. 16, figs. 22, 23; Ibid. vol. XXXI, 

 No. 5, 1883, p. 14, pi. v, figs. 57. 

 Leperditia Schmidti, Kolmodin. Ofvers, k. Vet.-Akad. Forli. vol. XXXVI, 1880, 



p. 133. 

 Leperditia balthica, Jones. A. M. N. H , ser. v, vol. VIII, 1881, p. 333, pL xix, figs- 



10 and 11. 



Length, (hinge-line), height, thickness. 

 L. Hisingeri {1856) 15.5 (10.) 11.5 7- mm. 



PI. 10, fig. 5 10.5 (7. ) 6.5 4.5 ram. 



PL 10, fig. 7 7. (5. ) 5.5 — mm. 



PM2, fig. 15 7.3 (5.7) 4.1 3. mm. 



PL 13, fig. 1 8.7 (5.7) 5.7 3.7 mm. 



PL 13, fig. 2 4.3 (3.3) 2.6 — mm. 



PL 13, fig. 3 6.3 (5. ) 4. 2.6 mm. 



PL 13, fig. 4 5.6 (3.6) 3. — mm. 



PL 13, fig. 5 4. (3. ) 2.5 — mm. 



Among the specimens which we have here figured several match 

 some of Schmidt's figures of Jj. Hisingeri, and a few have almost the 

 same outline. Thus, though pi. xii,fig. 15 and pi. xiii, fig. 3 (two right 



