59 



specimen is a little flattened by pressure, and it cannot, therefore, be 

 determined whether the section is circular or slightly ovate. Three of 

 the septa are visible near the apex, distant from each other about one line. 

 Siphuncle unknown. Length of the specimen 18 lines ; diameter at the 

 aperture 12 lines. Near Jupiter River ; Div. 2, A. G. J. Richardson. 



Genus Cyrtoceras, Goldfuss. 



C. FRAGILE, n. sp. — Shell of the ordinary size, rather strongly arched, 

 most ventriose about the mid-length, thence gradually tapering in both 

 directions ; siphuncle small ; close to the shell on the ventral or convex 

 curve ; septa about eight to the inch measured on the median line of the 

 ventral aspect ; section ovate, the dorso-ventral diameter bearing the pro- 

 portion of 9 to 7 to that of the lateral diameter. Surface unknown. 



The best preserved specimen has the following dimensions very nearly : 

 diameters at the aperture 7 to 5^ lines ; at the last septum 9 to 7 lines ; 

 at the tenth septum 4 to 3 lines ; depth of chamber of habitation 7 lines ; 

 length on the ventral aspect occupied by the last five septa 7 fines. From 

 the aperture to the tenth septum the ventral aspect is curved to a radius 

 of about 12 lines ; thence towards the apex more gradually. 



Judging from a number of broken and distorted specimens, some of the 

 individuals attained a length of four or five inches. Gamache Bay ; Div. 

 1, A. G. T. C. Weston. 



Genus Oncoceras, Hall. 



0. FUTILE, n. sp. — Shell fusiform, gradually expanding from the aper- 

 ture to the last chamber, and then tapering towards the apex. Eight septa 

 in the length of one inch. Siphuncle unknown. Width of the best preserved 

 specimen at the aperture 9 lines ; width at the last septum 14 lines ; at 

 the eighth septum 92 lines ; depth of chamber of habitation 11 lines. East 

 of Jupiter River ; Div. 3, A. G. J. Richardson. 



0. amator, n. sp. — Length of the specimen 12 lines ; lateral diameter 

 at the aperture 8 lines ; dorso-ventral diameter about 7 lines ; diameter at 

 the smaller extremity Bi lines. Surface cancellated with longitudinal and 

 transverse strite. Of the former there is a set sufficiently strong to give an 

 obscurely fluted aspect ; the space between each two of these is divided by 

 a smaller fine along the middle ; on each side are others stiU smaller and 

 more obscure. The transverse markings are, also, of several sizes. Siphuncle 

 and septa unknown. South-west Point ; Div. 4, A. G. J. Richardson. 



Genus Ascoceras, Barrande. 



A. Newberryi, B., Pal. Foss. vol. i, p. 164, fig. 148a, non. 148 J. — 

 Junction Clifi"; Div. 1,^. G. Also in H. R. 



