113 

 Hamites cylindraceus ? Defrancb. 



Plate 14, figures 2 and 2a, 



Hamitks cylindraceus, Defr. — D'Orbigny. — Pal. Franc, Terr. Cret., Vol. I., p. HSl, Atlas, 



pi. 136. 



Sucia Islands, in Division A. ; J. Eichardson, 1814. 



A single specimen whose sculpture seems quite different to that of 

 Hamites Vaneouverensis. and which if not specifically identical with the 

 S. cylindraceus as figured and described in the Pal^ontologie Francaise, 

 and as since characterized by Pictet, cannot at present be distinguished 

 from it. One side of both limbs of the fossil is worn away, and although 

 the sculpture of a large portion of the test is well shewn, as are most of 

 the details of the septation, still the specimen is not in a condition for 

 the species to be determined with much certainty. Its faint, close set, 

 equal ribs, which neither bifurcate nor bear tubercles, and more especially 

 its septation, even to the shape and relative size of its smallest auxiliary 

 lobes and saddles, are both almost exactly similar to those of H. cylin- 

 draceus. 



Pttchocebas Vancouverense. (N. Sp.) 

 Plate 14, figiu-es 3 and 3a. 



Several specimens of the anterior, and apparently nonseptate, half of a 

 Ptychoceras or Diptychoceras were collected by Mr. Eichardson in 1871, 

 from the Lower Shales, (Division B.) on the banks of the Trent Elver, V. 

 I., above the falls. These for the most part consist of nearly the whole 

 of the last limb and part of the last but one, with the elbow or shoulder 

 which connects them. Immediately at the bend the limbs are scarcely 

 two lines apart at their inner margins, and at a distance of rather more 

 than an inch from it they touch each other. The outline of a transverse 

 section of either limb is ovately-orbicular in most specimens, the 

 anti-siphonal side being wider than the siphonal, but in some it is oval 

 or ovate. The original of figure 3a, on Plate 14, appears to be a 

 fragment of the central part of the penultimate limb, for the ribbing 

 of the narrowest end is quite transverse, and that of the larger extremity 

 nearly so. 



The sculpture varies somewhat in different individuals and in different 

 parts of the same shell. Both limbs are more or less strongly ribbed on 

 the periphery and sides, but their inner surface is quite smooth. In the 

 middle of the penultimate limb the ribs are transverse, but at and near 



