PLATE III—Continued. 
ACEOTRETA, Kutorga. 
Page 101. 
Acrotreta Baileyi, Matthew. 
Fig. 32. An internal cast of a pedicle-valve ; showing the grooved subapical area and the impression of 
the nipple-like swelling surrounding the foramen. X 4. 
(Matthew, Trans. Roy. Soc. Canada, 18S5, pi. iv, fig. 13c.), 
Fig. 33. An internal cast of the brachial valve. X 4. 
(Matthew, op. tit., fig. 13.) 
Fig. 34. The exterior of a pedicle-valve ; showing the size of the outer foraminal aperture. X 4 
St. John group. Long Reach, King's county. New Brunswick. 
LINNARSSONIA, Walcott. 
Page 107. 
Linnarssonja misera (?), Billings (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. tit., fig. 12c.) 
Fig. 36. An internal cast of a brachial valve. X 6. - 
(Matthew, op. tit., fig. 12.) 
Fig. 37. An internal cast of a pedicle-valve. X 6. 
St. John group. Porter's Brook, St. John county, Neio Brunswick. 
Linnarssonia transyersa, Hartt (sp.). 
Fig. 38. An internal cast of a pedicle-valve; showing the inner foraminal aperture, the impressions of the 
foraminal callosity and cardinal tubercles. X 5. 
(Matthew, op. tit., fig. 11c.) 
Fig. 39. The counterpart of the same. X 10. 
Fig. 40. An internal cast of the brachial valve. X 5. 
(Matthew, op. tit., fig. 11.) 
Fig. 41. Posterior view of the same. X 5. 
Fig. 42. The counterpart of the same; showing the median and lateral septa and the large posterior 
scars. X 10. 
St. John Group. Porter's Brook, St. John county, New Brunswick. 
Linnarssonia 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. 1889.) 
Quebec group. Island of Little Metis, Province of Quebec. 
