PLATE 4 
Fics. 1 a-d. Rhynchonella portlandica Blake. Paratype. Lower Volgian, (Lower 
Portland Sand). St. Alban’s Head, Dorset, England. B.M. B. 52284. 
Fics. 2a-d. R. portlandica Blake. Holotype. Details as fig. 1. B.M. B. 52283. 
Fics. 3 a-d. Rhynchonella loxiae Fischer. Upper Volgian. Khoroshevo near Moscow. 
Collection of Dr. D. V. Ager. 
Fics. 4 a-b. Rhynchonella cf. R. portlandica Blake. Lower Volgian, (Portland Sands). 
Ringstead Bay, Dorset, England. B.M. B. 72240. 
Fics. 5 a-d. Rhynchonella cf. R. portlandica Blake. Lower Volgian, (Basal Shell Bed, 
Portland Limestone). Cliff N.W. of Portland, England. Collection of the University Museum, 
Oxford. J. 1006. 
Fics. 6a-d, 7,8. Rhynchonella sp. Kimmeridgian, ?pseudomutabilis zone, (Boulder Beds). 
West Garty, Sutherland, Scotland. B.M. BB. 44146-7, 45162. 
Fics. 9 a-c, Io a-d, 11 a-d, 12 a-d. Rhynchonella cf. R. portlandica Blake. Lower 
Volgian, (Upper Blacknore Beds). West Weare Cliffs, Portland, England. Collection of the 
University Museum, Oxford. J. 2462. 
Fics. 13 a-d, 14 a-d. Rhynchonellacf. R. portlandica Blake. Lower Volgian, (upper part 
of Portland Sand). Foot of Gad Cliff, Dorset, England. Collection of the University Museum, 
Oxford. J. 167. 
Fics. 15 a-d. Rhynchonella cf. R. subvariabilis Davidson. Lower Volgian, (top of Kim- 
meridge Clay just below Portland Sands Passage Beds). Chapman’s Pool, Dorset, England. 
B.M. B. 47251. 
Fics. 16 a-d. Rhynchonellacf. R. subvariabilis Davidson. Lower Volgian, (Kimmeridge 
Clay, about 40’ below votundum nodules). Chapman’s Pool, Dorset, England. Collection of the 
Sedgewick Museum, Cambridge. J. 1500. 
Fics.17a-d. Rhynchonellacf. R. sarapaulensis Makridin. Lower Volgian, (Kimmeridge 
Clay, rotundum nodules). Chapman’s Pool, Dorset, England. Collection of the Sedgewick 
Museum, Cambridge. J. 1512. 
Fics. 18 a-d. Rhynchonella cf. R. portlandica Blake. Lower Volgian, (Lyddite Bed, 
Portland Beds). Long Crendon, Buckinghamshire, England. Collection of the Sedgewick 
Museum, Cambridge. J. 1524. 
