APPENDIX. 17 



T. impressa, T. Bakeries, T. emarginata, and T. Waltoni are all allied forms, but my observations 

 have not yet warranted the propriety of merging them in T. carinata. 



Page 38, Ter. Bakerice. 



It is probable that T. Heysiana of W. Dunker and Meyer, published in the same year as this 

 monograph, may belong to the same species. (See ' Palseontographica Beitrage Natur. derVorwilt,' pi. xviii, 

 fig. 5, J 851.) 



Page 40, Ter. ornithocephala, Sow., T. lagenalis, and T. sub-lagenalis. 



I entirely agree with Professor Buckmann, that the three shapes above mentioned, belong to a single 

 species ; and as Sowerby's name is the oldest, it should be the only one preserved ; a similar opinion has 

 been already expressed by several authors, among whom we may again mention Professor Bronn, nor was 

 I far from admitting the fact in 1851, but must beg leave to dissent from the learned professor of the 

 Cirencester Agricultural College, in his assertion that T. digona and T. obovata are nothing more than forms 

 or varieties of T. ornithocephala. 1 Few authors would sanction such a combination, and I may here add 

 the observations communicated to me on this subject, by the Rev. A. W. Griesbach, whose long residence in a 

 Cornbrash district, and whose experience is worthy of respect. "Long before Professor Buckmann published 

 his paper, I had come to the conclusion that T. ornithocephala, T. lagenalis, and T. sub-lagenalis are only 

 forms of the same species ; I have had several hundred specimens, and it is impossible to say of very 

 many of them, that they belong to one type more than another. They flow into each other by such gentle 

 gradations that the conclusion I refer to is unavoidable." 



"As to Ter. obovata being the same species also, I do not think it can be borne out. I have multi- 

 tudes of specimens, or have had, and yet there can be no doubt, even at a glance, that T. obovata is obovata, 

 and not either of the other three forms. T. digona has certain well-defined characteristic marks, which 

 when well known, will enable any one at once to distinguish it from T. obovata, some forms of which, how- 

 ever, closely resemble T. digona. I believe it to be a thorough good species, as most other people do." 2 



Page 39, Ter. obovata. 



A single specimen of this species (agreeing in size and characters with those figured from the Corn- 

 brash of Rushden), has been discovered in the Coral Rag of Malton (Yorkshire), by Mr. Ed. Barton, this 

 fact was first brought to my notice by the Rev. A. W. Griesbach, and I have to express my obligations 

 to Mr. Barton for the communication of the specimen. 



Page 43, Ter. cardium, Lamarck. 



I am informed by the Rev. A. W. Griesbach, that he has discovered a single specimen of this species 

 in the Cornbrash of Rushden. 



1 On the Cornbrash of the Neighbourhood of Cirencester, 'Annals and Mag. of Nat. Hist.,' vol. x, 

 2d ser., p. 262, 1853. 



2 I much regret that Prof. Buckmann did not publish the names of the seven Cornbrash distinct 

 species of Brachiopoda with which he states he is acquainted, from the neighbourhood of Cirencester. 



