PLATE III— ContinueU. 



ACROTRETA, Kutokga. 



Page 101. 



AcROTRETA Baileyi, Matthew. 



Fig. 32. An internal cast of a pediole-valve ; showing' the grooved subapical area and the impresBion of 

 the nipple-like swelling suiTOumling the foramen. X 4. 

 (Matthkw, Trans. Roy. Soc. Canada, 1SS.3, pi. iv, tig. I'Sr..) 

 Fig. 33. An internal cast of the brachial \-alve. X 4. 



(Matthew, op. cit., tig. 13.) 

 Fig. 34. The extei-ior of a pedicle-valve ; .showing the size of the outer foi-aminal ajiertare. X 4 

 St. John gi-oup. Lo7ir/ Meach, King's county, New Brunswick. 



LINNARSSONIA, Walcott. 



Page 107. 

 LiNNARSSONIA MISERA (?), BillillgS (sp.). 



Fig. 35- An internal cast of a pedicle-valve : showing the impressions of the cardinal bosses and the 

 foraminal callosity. X 6. 

 (Matthew, op. cit., fig. 12c.) 

 Fig. 36. An internal cast of a brachial valve. X 6. . " ' 



(Matthbw, op. cit., fig. 12.) 

 Pig. 37. An internal cast of a pedicle-valve. X fi. 



St. John group. Porter's Brook, St. John county, Neio Brunswick. 



LiNNARSSONIA TRANSVERSA, Hailt (sp.). 



Fig. 38. An internal cast of a pedicle-\'alve ; showing the inner foraminal apei-tiu'e, the impi'essions of the 

 foraminal callosity and cardinal tubercles. X ;">• 

 (Matthew, op. cit., fig. lie.) 

 The counterpai't of the same. X 10. 

 An internal cast of I he brachial valve. X 5. 

 (Matthew, op. cit., fig. 11.) 

 Posterior view of the same. X 5. 

 42. The counterpart of the same ; showing the median and lateral septa and the large postoioi 

 scars. X 10. 



St. John Group. Porto's Brook, St. John, coimty, iViw Brunswic^c. 



L1NNAR.SS0NIA PRETIOSA, Billings. 



Fig-. 43. The interior of a pedicle-valve. X 6. 

 Fig. 44. The interior of a brachial valve. X 6. 



(See Dawson, Trans. Roy. Soc. Canada, vol. vii. Sect, iv, p. 53. 1S89.) 

 Quebec group. Island of lAUle Metis, Province of Quebec. 



Fig. 



39. 



Fig. 



40. 



Fig. 



41. 



Pig. 



42. 



