EARLY DEVONIC HISTORY OF NEW YORK AND EASTERN NORTH AMERICA I 53 



of the Dartmouth, the latter crosses the outcrops of the Grande Greve Hme- 

 stones which are here marked as fossiliferous on Dr Ell's map. The matrix 

 of the originals is a gray argillaceous limestone such as does not, as far as 

 Ave have observed, occur in the Gaspe sandstone. We hence venture to 

 include it in the limestone fauna. 



Coelidium hebe (Billings) 



Plate 17, figures 31, 32 



Murchisonia hebe Billings. Palaeozoic Fossils. 1874. v. 2, pt i, p. 57, 

 fig. 28; pi. 5, fig. 6 



Original description. From three to four inches in length; apical angle about 20° ; 

 whorls, about ten in a specimen three and one half inches in length, uniformly and 

 moderately convex; a narrow band in the middle. Surface with fine striae which curve 

 backwards to the band, forming therewith an angle of about 40° . 



A specimen consisting of the five last whorls and about half of the aperture is thirty- 

 three lines in length. Width of the last whorl, twelve lines; and of the fifth whorl from 

 the base, five lines. From the middle of the body whorl to the middle of the fifth, the 

 length is twenty-one lines. The specimen therefore tapers seven lines in a length of 

 twenty-one. When perfect it probably had nine or ten whorls. 



Another specimen with six whorls is thirty lines in length; width of last whorl, 

 twelve lines, and of the fifth, four and one half lines. This specimen retains the sur- 

 face markings and band on a part of the body whorl. The band is about one line in 

 width. 



Specimens of this type, of much the same inferior preservation as those 

 described by Billings, are common in the limestones; none however add 

 much to our knowledge as they are mostly of inferior quality and show no 

 traces of the slit-band seen in the original. These shells carried a band at 

 the suture while the surface was concentrically crossed by extremely fine 

 lines. 



It is a species very similar to Hall's Loxonema fitchi and L. 

 planogyrata from the Helderbergian of New York. 



Localities. At Grande Greve, Indian Cove (the original locality), 

 Shiphead and all coast outcrops. 



Bellerophon planus Billings 



Plate 17, figures 25-28 



Bellerophon plenus Billings. Palaeozoic Fossils. J 874. v. 2, pt i, p. 62, 

 pi. 5, fig. 8a, b 



Original description. The casts of the interior of this species are broadly rounded 

 on the dorsum ; narrowly convex around the umbilicus; the aperture transversely ex- 

 panded. In the transverse section the inner side of each whorl is indented to the extent 

 of one third, by the dorsum of the preceding whorl. The umbilicus, measured across from 

 the most projecting points of the whorl around it, is about one third of the whole diameter 

 of the shell. It diminishes in width rapidly inward,s. The keel appears to be about one 

 line wide at the aperture. None of the surface characters are seen on the casts, except 



