344 



more compressed laterally. The fragment of a whorl from the Cretaceous 

 rocks of Saghalien (Sachaliu) that Friedrich Schmidt' figures under the 

 name Ammonites planulatus, ^ has a very similar kind of ribbing to that 

 of P. Neevesii, but the Saghalien specimen is marked also with distinct 

 and distant, periodic constrictions. Dr. Kossmat, who has examined the 

 Sucia Island fragment of P. J^eevesit, and a good photograph of the James 

 Island specimen, writes that he knovrs no species with which they could 

 be united. 



Pachydiscus Suciensis, Meek. (Sp.). 



Ammonites conqilexus, var. Suciaensis, Meek. 1861. Proc. Acad. Nat. Sc. Philad., vol. 



XIII, p. 317. 

 Ammonites Brewerianus, Gabb (pars). 1864. Geol. Surv. Calif., Palseont., vol. i, pi. 



XXVII, figs. 199 and 199 6, c ; and pi. xxviii, fig. 199 a. 

 Ammonites complcxus? var. Suciaensis, Meek. 1876. Bull. Geol. and Geogr. Surv. 



Terr., vol. ii, p. 369, pi. v, figs. 2 and 2 a, b, c. 

 Ammonites complexus, var. Suciensis, Whiteaves (pars). 1879. This volume, pt. 2, p. 

 106 ; but only the specimen referred to on p. 107, as No. 1, and per- 

 haps that referred to as No. 2. 



The original types of A. cornplexus, var. Snaiaensi-i are from the Sucia 

 Islands, and Comox, V.I., where they appear to have been collected by 

 Mr. George Gibbs in 1S5S. 



In the second part of this volume, on pages 107 and 108, six of the 

 specimens collected by Mr. Richardson were identified with this species. 

 Of these. No. 1 is clearly a typical specimen of P. Suciensis. It is a 

 well preserved cast of the interior of the shell, nearly four inches in its 

 greatest diameter, from the Sucia Islands. No. 2 is a cast of the interior 

 of the outer volution of a large specimen of a species of Pachydiscus, 

 from North West Bay, Vancouver Island. Its shape and sculpture are 

 very similar to those of P. Suciensis, but its rilts are much more prominent 

 proportionately, though perhaps not more so than would be consistent 

 with its being a well marked variety of that species. Nos. 3, 4^ 5 and 6, 

 from the Trent River, V.I., are probably distinct from P. Suciensis. Dr. 

 Kossmat, who has seen one of the best of these four specimens, thinks 

 that it may possibly be referable to P. Nervherryanus, but in each of the 

 four the outer volution is subglobose and much more convex. Outside 

 of the emargination caused by the encroachment of the previous volution, 

 the aperture of these Trent River specimens is wider than high, whereas 

 that of P. Newberryanus is much higher than wide. At one time the 

 writer thought that Nos. 3, 4, 5 and 6 were conspecitic with the Ammon- 

 ites Arrialoorensis oi Stoliczka, (erroneously cdWed A. Deccanensis on Plate 



* On Plate 1, figs. 5 to 7, of volume xix, of the Memoires de rAcademie Imperiale 

 des Sciences de St. Petersbourg, Seventh Series, 1873. 



