GRAMMOCERAS ORBIGNYI. 



187 



Dr. Haug informs me that Reinecke's collection has disappeared, so that it is 

 impossible to appeal for final judgment to an examination of the original specimen. 

 We must, therefore, take the figure as it stands, and judge it on its merits. The 

 specimen which Dr. Haug sent me, and which is here figured, is from the Opalinum- 

 zone, Gundershofen. When I come to the genus Dumortieria I shall have more 

 to say about this interesting species, and shall then point out why the straightness 

 of the rib upon the lateral area is such an important feature. 



Fig. 3. 

 O/ he 



Figs. 2 a, h. — Copy of Reiuecke's original figure of " Nautilus radians," ' Maris ProtogKi Nautilos et 

 Argon autos,' &c , figs. 39, 40. 



Figs. 3 a, b, c. — A specimen sent to me by Dr. Haug as " Orammoeeras radians" to bo figured in 

 comparison with Reinecke's original. The small curvature of the ribs on the lateral area and the 

 absence of the long ventral projection should be compared with the figures of the genus Orammoeeras. 

 (Natural size.) Opalinum-v.owe, Gundershofen. 



Since I have thus interpreted Reinecke's Am. radians in a manner different 

 from every other author, except Quenstedt in part, I have of course to give a 

 fresh name to the species which was figured by d'Orbigny as Am. radians. 



Dr. Haug suggested to me that it would be preferable to consider d'Orbigny's 

 Am. radians as the type of the species, and to strike Reinecke's figure out of the 

 question altogether ; but I am extremely reluctant so to violate the law of priority 

 when the figure can really be identified, to my complete satisfaction, with specimens 

 of Dumortieria in my own cabinet, not to mention those in Dr. Haug's as proved 

 by what he sent me. I think, in this case, we have no excuse to justify such a 

 proceeding. Neither is there any reason why d'Orbigny's figure should be taken as 

 the type. In fact, to show the great diversity of opinion to which the interpretation 

 of Am. radians has given rise, I have appended on the next page a synopsis of the 

 references to that species from my point of view. Probably this belongs more 

 correctly to the article on Am. radians ; but I must give my reasons here for the 

 change of name ; and, also, I shall not reach that species for some time. 



I cannot say anything nearer concerning the horizon of this very scarce 



