NATURAL SCIENCES OF PHILADELPHIA. 363 



specimens sent by Mr. Kennicott from Fort Rae and Big Island, have hitherto 

 been unnamed, although birds from the same locality were examined by Sir 

 John Richardson, and the plumage described by him, under the belief that they 

 belonged to the true phasianelhts. 



We have named the present species in honor of Robert Kennicott, who in the 

 course of his arduous explorations of the interior of Arctic America, has ob- 

 tained and forwarded to the Smithsonian Institution three fine specimens. 



Notes on Cretaceous Fossils with descriptions of a few additional new species. 



BY W. M. GABB. 



Since my last paper on Cretaceous Fossils has gone to press, I have had an 

 opportunity of examining the collection of the Burlington County Lyceum of 

 Natural History, at Mt. Holly, N. J. Besides most of the common species, I 

 found several very rare ones, and two or three which were entirely new to me. 

 I shall embrace the present opportunity for mentioning some new facts in re- 

 gard to certain species and for clearing up some doubtful points in the affinities 

 of others. 



It may be worth mentioning, that besides the species described by myself 

 and others, from time to time, ia the publications of this Society, over one-third 

 of all the New Jersey Cretaceous fossils in my collection are, as yet, nondescript; 

 and many of the specimens unique. This is true, in a smaller proportion, of the 

 same portion of the Academy's collection. I think I have undoubted proof of the 

 existence of upwards of two hundred unnamed and uncharacterized species of 

 Cretaceous fossils, found in Alabama and New Jersej\ The reason of this is, 

 that they are usually found in the shape of casts, and in most cases are not 

 sufficiently characteristic to determine the genera. 



Turritella Lam. 



T. granulicosta, n. s. Shell elongated, whorls many, increasing very 

 gradually in size, almost perfectly flat on the sides. Suture impressed, very 

 distinct; bordered below by a slight elevation of the upper edge of the succeed- 

 ing whorl ; lower angle of the whorl, rounded, subangular. Mouth small, sub- 

 quadrate, anterior angles rounded. Surface marked by about twelve fine, 

 thread-like revolving ribs, three of which are larger than the rest, are placed at 

 equal distances from each other, and from the upper and lower edges and are 

 slightly undulated so as to produce a series of minute nodes. This character 

 shows itself to a much less extent on some of the smaller ribs. Under surface of 

 the body volution marked by a few fine revolving ribs, with regular concavi- 

 ties between them. 



Length of last four volutions, -7 in. Width of body whorl, -3 in. Length of 

 aperture, -2 in. 



Locality. Burlington Co., N. J. 



I have long been acquainted with casts of this species, differing only from 

 those of T. vertebroides, Mort. in size. This specimen, belonging to the Mount 

 Holly Society, is the first one I have ever seen that has shown any characters 

 on which to separate it. It has the shell perfectly preserved on a large portion 

 of its surface, and is one of the best characterized species in the formation. 

 There is another species found with it, of which I have only seen casts. They 

 are of about the same size and marked by a few large longitudinal ribs. 



Natica Adanson. 



N. acutispira Shum. Through the kindness of my friend Dr. Moore, 

 State Geologist of Texas, I have had the opportunity of examining a specimen 

 of this species. It i3 undoubtedly authentic, and may be the type. It is, how- 



1861.J 



