16 Transactions of the Society. 



and the remaining five by the '•' 3 a 4 coquilles en outre " referred 

 to on the label. These are not in "glass boxes "in the set 

 preserved as it was received by La Eochelle, but are the coarse 

 brown paper slips above referred to, on which are heavily gummed 

 a few of the actual shells, generally of the larger and more robust 

 forms, represented by Models in the particular instalment/ 



As promised on the label, with the fourth instalment, in 

 1826, each subscriber received a pamphlet of 150 pages, entitled ^ 

 " Tableau Methodique de la Classe des Cephalopodes par M. Dessa- 

 lines d'Orbigny (Extraitdes Annales des Sciences Naturelles, etc.)," 

 Paris, Chez Crochard. Cloitre St. Benoit, No. 16, 1826. The 

 plates are sometimes folded to the size of the pamphlet, and at 

 page 148 commences a list headed " Explication des Modeles." ^ 



Messrs. Parker and Jones in the year 1865 made a most 

 elaborate and painstaking study of these Models, discussing the 

 identities of each one in turn and giving excellent outline repre- 

 sentations of them (see Bibl. XIX.). To this they appended a Table, 

 in which d'Orbigny's original name is given, and, in juxtaposition, 

 corrected names, showing where d'Orbigny's nomenclature required 

 to be altered after reference to other authorities.* 



There remains to be mentioned a mysterious " Fifth instal- 

 ment," which is mentioned frequently in the four monographs 

 published by d'Orbigny in 1839-40, and in the Vienna mono- 

 graph of 1846. It is first announced in the Cuba monograph, and 

 thereafter as if it had been issued, but in spite of diligent inquiry 

 I have not been able to trace the existence of any of these later 

 Models, but it was evidently his intention to include in this 

 instalment Models of typical species instituted by him in those 

 later works. I have noted fifteen Models thus referred to, of 

 which a list will be found with the requisite references in 

 Appendix D. 



* I possess, by the courtesy of the Administration of the Mus6e Fleuriau de 

 Bellevue, two or three of these brown paper mounts, and a few samples of the 

 material from the bottles of d'Orbigny pere. 



- This title is taken from a copy preserved in the- Department of Conchology 

 at the British Museum (Natural History). (See, however, Appendix C.) 



•* The Models were all recast and reissued as a second edition en bloc in 1843. 

 In the pamphlet accompanying them the whole of d'Orbigny's original introduc- 

 tion is suppressed, and it consists of merely a short introductory paragraph 

 followed by the list from p. 148 of the original pamphlet (24 pp.). The title is : — 

 " Modeles de Poraminiferes vivans et fossiles, par Alcide d'Orbigny. Deuxi^me 

 edition. Paris, 1843. Cosson." It will be remembered that F^lix Dujardin had 

 " happened " since the first issue. 



* They also append a list and description of the IModels issued in 1861-5 by 

 Reuss and Fritsch with a view to supplementing or completing the d'Orbigny 

 Models. These Models have not received extended recognition among Ehizo- 

 podists. 



