PLATE III— Continued. 



ACKOTRETA, Kuxorga. 



Page 101. 



AcROTRETA Baileyi, Miitthew. 



FifT- 3'-3. An inteinal cast (if a peilicle-valve ; showing' the grooveil subajiical area and the impression of 

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

 (Matthew, Trans. Roy. Soc. Canada, 18S3, pi. iv, fig-. 13c.) 

 Fig. 33. An internal cast of the brachial valve. X 4. 



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

 Fii'-. 34. The exterior of a pedicle-valve ; showing the size of the outer foraniinal aperture. X 4 

 St. John group. Lo7Uj Reach, Klnc/'s county. New Brunswick. 



LINNARSSONIA, Walcott. 



Page 107. 



Linnarssonia miseua (?), Billiiig.s (»!>.). 



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

 foramina! callosity. X 6. 

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

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



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

 Fig. 37. An intei-nal cast of a pedicle-valve. X (>. 



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



Linnarssonia transversa, Hiirtt (.sp.). 



Fig. 3S. An internal cast of a pedicle-valve; showing the inner foraniinal aperture, the impressions of the 

 foraniinal callosity and cardinal tubercles. X o- 



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

 Fig. 30. The counterpart o'f the same. X 1'^. 

 Fig. 40. An internal cast of the brachial valve. X 5- 



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

 Fig. 41. Posterior view of the same. X ». 



Fig. 42. The counterpart of the same; siiowing the median and lateral septa and the large postei'ioi 

 scars. X in. 



St. John Group. Forter'.s Brook, St. .Talin connty. New Brmiswick. 



Linnarssonia pretiosa, Billing.s. 



Fig. 43. The interim' of a pedjcle-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. 1889.) 

 Qnebet- gi'ouj). Island of Little Metis, Province of Quebec. 



