109 



Group 5. — Ligati, B'Orbigny. 



SiTB-OBifUS Pkbisphinctes ? "Waagcn. — " Geognostich-Palaaontologische B^itrage," Von 

 Dr. E. W. Benecke, Muncheii, 1869. Vol. II., p. 248. 



Ammonites Newberryanus, Meek. 



Plate 14, figs. 1 and la. 



Ammonites Newberri/anuSj Meek. — Tians. Alb, Inst., 1857, Vol. IV., p. 4T. 



« " Bui. Geol. and Geogr. Surv. of Terr., Vol. II., No. 4, 



p. 367, pi. 4, figs. 3, 3a and 3b. 



Comox, V. I., Meek. Middle Shales, Division D, North-West side of 

 Hornby Island, one specimen ; J. Eichardson, 1871. Lower Shales, 

 Division B, of Brown's Eiver (one), and lower part of the Trent River 

 (two), V. I. ; also South-West side of Denman Island (one) ; J. Richardson, 

 1871. Productive Coal Measures, Division A, from Xorth-AYest Bay, 

 V. I., J, Eichardson, 1873, ten specimens; and from the Sucia Islands 

 (six do.) ; J. Eichardson, 1874. Most of these are casts ; but two indi- 

 viduals from the Sucia Islands have the pearly inner layer of the test 

 beautifully preserved, and a specimen from North- West Bay shews the 

 porcellanous outer laj^er also. 



Although typical and well preserved examples of this and the preceding 

 species may be distinguished from each other without much difficult}- by 

 the help of Mr. Meek's descriptions and figures, it is by no, means easy 

 to identify water-worn or imperfect specimens of either, and aberrant or 

 partly intermediate varieties occur, which are very puzzling. 



The characters by which A. ISewherryanus can be most readily separated 

 from A. complexus, var. Suciensis. are four in number, and these may be 

 briefly stated as follows : — 



1. The lobes and saddles of A. Newberryanus, especially those on or 

 near the periphery, are shorter, smaller and much less divided than are 

 those of A. complexus, var. Suciensis. Thus in A. Newberryanus the 

 siphonal lobe has three principal branches on each side, and these are 

 again divided at their summits into two or three branchlets. In A. 

 complexus, var. Suciensis, the siphonal lobe has /owr branches on each side, 

 and the apices of both are divided into four or five unequal, spreading 

 branchlets. 



2. Nearly all the specimens collected by Mr. Eichardson, which in 

 other respects correspond with the typical A. Newberryanus, have their 

 whorls much more compressed laterally than is the case with A. complexus, 

 var. Suciensis. Their dorso-ventral diameter exceeds their width by 



I 



