190 PALEOZOIC PALEONTOLOGY. 
Remarks.—Fragments of this shell occur with the last, but they 
can always be distinguished by their very different surface markings. 
In general size and proportions the two species are much alike. 
ORTHOCERAS sp. undet. 
Plate XIII., Fig. 6. 
A single imperfect specimen of an Orthoceras in the collection is 
apparently different from either of the two preceding species. The 
shell expands more rapidly and seems to be marked by obscure annu- 
lations. The specimen is slightly curved, and if this feature is not 
accidental, it should, perhaps, be referred to the genus Cyrtoceras. 
The dimensions of the specimen are: length, 25 mm.; diameter at 
larger end, 8 mm.; diameter at smaller end, 3 mm. 
CAMEROCERAS PROTEIFORME (Hall). 
Plate XMIT., Wig. 5. 
1847. Hndoceras proteiforme Hall, Pal. N. Y., vol. I., p. 208, pl. 46, 
figs. 1 a—b, 2 (?), pl. 48, figs. 1, 2 (?), 3, 4, pl. 49, figs. 
1 a-e, pl. 50, figs. 1-3, i 52, figs. 1 a—b, pl. 53, figs. 1 a-e, 
pl. 55, fig. 1, pl. 57, figs. 1 a—b. 
1897. Cameroceras proteiforme Cle. Pal. Minn.; pt. Lp 
pl. 48, figs. 1-2, ae oe fig. 2, pl. 50, figs. 1-3, pl. 51, figs. 
1-3, pl. 53, figs. 
A few imperfect specimens of the siphonal casts of this species 
have been recognized in the New Jersey collections. The larger ones 
have a diameter of 35 mm., but all are too imperfect for description. 
An. illustration of one of the best specimens is given. 
