282 



This delicately sculptured fossil is not at like any American species of 

 Ammonite that the writer is acquainted with, and seems to be nearest to 

 the A. Gargasensis of the French Neocomian, though perfectly distinct 

 therefrom. The specific name proposed for the former is in honour of its 

 discoverer, Dr. C. F. Newcombe, who has done so much to advance our 

 knowledge of the geology, paheontology and ethnology of British Colum- 

 bia, and who collected most of the specimens that are described or enu- 

 merated in this paper. 



Desmocekas latidorsatum, Michelin. (Sp.) 



Ammonites latidorsatus, Michelin. 18,38. Mem. Soc. Geol. France, vol. ill, p. 101, pi. 

 12, fig. 9. 

 " „ D'Orbigny. 1840. Pal. Franc, Terr. Oret., vol. i, p. 270, pi. 80. 



n M Pictet and Roux. 1847. Foss. des Gres Verts, p. 44, pi. 3, 



figs. 4 and 5. 

 „ „ Stoliczka. 1865. Cret. Cephalop. S. India, p. 148, pi. 74, 



figs. 1-4. 

 Ammonites inanis, Stoliczka. 1865. lb., pi. .59, fig. 14. 



Desmoceras latidorsatinn, Kossmat. 1897. Untersuch. lib. die stidindische Kreidefor- 

 mation, pt. 3, p. 107 (172), pi. 19 (25), figs. 2, a-h ; .3, u-b ; 

 4, a-h ; and 5. 



A few specimens, that agree very well with the descriptions and figures 

 of this species, were collected by Dr. Newcombe in 1895 at Bear Skin 

 Bay and at the east end of Maud Island. All of those that the writer 

 has seen are mere casts of the shell, with the sutures of the septa either 

 not preserved at all, or with their finer details almost oV>literated by 

 weathering. The largest and most perfect specimen is eighty-eight 

 millimetres in its greatest diameter, and forty-three mm. in breadth or 

 thickness near the aperture. It shows seven flexuous transverse con- 

 strictions on the outer volution, with tongue-like processes on the venter, 

 but there are probably two or three more of these constrictions, as the 

 posterior end of that volution is covered with the matrix. Between 

 them, and parallel with them, there are remains of low, faint and close set 

 costulfe. In another specimen the outline of a transverse section of the 

 body chamber near the aperture is crescentic, the venter and sides being 

 rounded and the dorsum broadly and deeply grooved for the reception of 

 the previous volution. 



The largest of the five specimens from South Island, and the two speci- 

 mens from Bear Skin Bay, that were identified with Lytoceras Timo- 

 iheanum on page 203 of the third part of this volume, are now believed 

 to be referable to Desmoceras latidorsatum. 



Desmoceras (Puzozia) planulatum 1 Sowerby. Var. 

 Plate .36, fig. 2 ; and pi. 37, fig. 2. 



Haploceras planulatum, Whiteaves. 1884. This volume, pt. 3, p. 207, pi. 28, fig. 1. 



