204 



specimens : North shore of Cumshewa Inlet, one fine and nearly per- 

 fect example, whose maximum diameter is three inches. 



(Harpoceratidx. ) 



HAPLOCERAS PEREZIANDM, Whiteaves. 



Ammonites Perezianus, Whiteaves. 1876. This volume, page 19, pi. 2, figs. 



1 and la. 

 Not Ammonites Perezianus, D'Orbigny. 1850. Prodrome de Paleontologie, p. 99. 



South Island, Skidegate Channel : two tolerably perfect and typical 

 specimens and two fragments. North shore of Cumshewa Inlet, one 

 example. 



In the collection there are also two specimens from South Island 

 which may be referable to this species. The largest of these, whose 

 greatest diameter is fifty seven millimetres, differs from the typical 

 form of H. Perezianum, as does the smaller one, in having a more 

 abruptly rounded umbilical margin, and in the greater prominence of 

 the flexuous undulations or plications on the sides, which (plications) 

 frequently bifurcate at a distance about half-way between the umbili- 

 cal margin and the periphery. These two specimens have evidently very 

 close affinities with the Ammonites bicurvatus of Michelin, as figured by 

 d'Orbigny on plate 84, figure 3, of the " Terrains Cre'tace's," though in 

 the French species the inner face of the whorls is represented as 

 squarely truncated and the umbilical margin as acutely angular. 



A. Perezianus, nobis, (non d'Orbigny) was originally supposed to be 

 an Oppelia nearly related to 0. subcostaria, Oppel, and 0. Waageni, 

 Zittel. The specimens obtained by Dr. Dawson, however, seem to 

 show that it is rather an Haploceras of the type of A. bicurvatus, 

 Micbelin, and of A. Clevn, d'Orbigny. 



As the Ammonites Perezianus of d'Orbigny, from the Neocomian of 

 the " departement du Var, de Nice, d'Espagne, etc.," clearly belongs to 

 the genus Olcostephanus of Neumayr, there will be no necessity for 

 any change in the name of the present species. 



