The Quarterly journal of the Geological Society of London . ry to review the whole of stratigraphical positions are shown below, as well as theirgeneric connexion among themselves and with other fossils. Thecourse of development is increase of plication and decrease inelevation of mesial fold. Thus the series may be traced back toRhynchoneUa acuta of the Marlstone (Middle Lias), and forward toRhynchoneUa subangulata. The RhynchoneUa acuta, has an uni-plicate mesial fold ; Rh. cynoprosopa and cynocephala have generallytriplicate folds—the 1 and 3 forms rare; Rh. cynica has no 1-foldf
The Quarterly journal of the Geological Society of London . ry to review the whole of stratigraphical positions are shown below, as well as theirgeneric connexion among themselves and with other fossils. Thecourse of development is increase of plication and decrease inelevation of mesial fold. Thus the series may be traced back toRhynchoneUa acuta of the Marlstone (Middle Lias), and forward toRhynchoneUa subangulata. The RhynchoneUa acuta, has an uni-plicate mesial fold ; Rh. cynoprosopa and cynocephala have generallytriplicate folds—the 1 and 3 forms rare; Rh. cynica has no 1-foldform, the 2 and 3 forms common, and the 4 form rare ; while has 4, 5, and 6-plait mesial folds—the fewer-fold form,according to Mr. Upton, being geologically earlier. Vol. 5i.] HEMERjE. bradfordeiisis. 4. Bh. cynomorpha, sp. n OF THE MID-COTTESWOLDS. 449 Murchisoncs. aalensis. Moorei. Dumortierice. 7. Bh. Brasili,ep. n. 6. Bh. sp. Bh. subangulata 5. Bh. aff. Wcigandi. 1. Bh. f «**««»?. [ cynocephala. (Bh. cynica) \. Bh. cynica, sp. n. 2. i?A. cynoprosopa, sp. n. Rhynchonella Stephensi, Davidson=? cynocephala. (Richard).(PL XIY. fig. 1.) 1810. Terehratula cynocephala, Richard, Bull. Soc. geol. France, vol. xi. pi. 5 a-d, p. 263. 1877. Rhynchonella Stephani, Davidson, Brach. Inf. Ool., Proc. Dorset & Ant. Field-Club, vol. i. pi. iv. fig. 13. 1877. Rhynchonella cynocephala, Davidson, ibid. pi. iv. fig. 16. 1878. Rhynchonella Stephensi, Davidson, Monogr. Brit. Fossil Brachiopoda, p. 220, Pal. Soc. Suppl. pi. xxvii. fig. 20. 1882. Rhynchonella cynocephala, S. Buckuian, Bracb. Inf. Ool., Proc. DorsetNat. Hist. & Ant. Field-Club, vol. iv. p. 42. A Rhynclionella—one of the pugnaces. The mesial fold narrow,fairly elevated, generally biplicate, its sides convergent. The history of this species is worthy of particular notice. In 1877Davidson figured a 3-plait form by the name cynocephala ; but atthe same time he depicted
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