354 Some New Species of Fossils from the Cincinnati Group. 



do not belong to the genus Stenopora, the names should be written 

 Monticulipora fibrosa instead of Chetetes pulchellm and Chetetes attritus, 

 and Monticulipora subpulchella instead of Chetetes subpidchellus. 



Monticulipora Dalei (Edwards and Haime.) 



The surface of this species is sometimes covered with conical or 

 elongated tubercles, at other times the eminences consist of trans- 

 versely elongated ridges, that extend part or all the way round the 

 branches. The latter form Prof. Nicholson identifies as Monticulipora 

 rugosa of Edwards and Haime, and he proceeds to point out its distin- 

 guishing differences, one of which, he says, is the "greater develop- 

 ment of the system of the minute tubuli between the ordinary coralli- 

 tes" in rugosa, than is seen in Dalei. It has been well known, by the 

 collectors at Cincinnati, for several years, that these two forms are 

 found well developed on the same specimen, some specimens of Dalei 

 are rugose others are papillose and other specimens are both papillose 

 and rugose. As a specific name or even as a variety name in classifi- 

 cation rugosa has no existance, if it is founded alone on specimens from 

 the Cincinnati (jroup. Chetetes approximatus of Nicholson which should 

 be written Monticulipora cifproximata, is never, so far as my observation 

 has extendefi, covered with elongated tubercles, as in the rugose va- 

 riety of the Dalei. Moreover the approximata is found abundant, in 

 the rocks from 300 feet to 350 feet above low water mark, where it is 

 very rare to see a piece of the Dalei, while the latter abounds, in the 

 rocks, from 350 to 400 feet above low water mark, where the former 

 is comparatively quite as rare as the latter is, in the rocks first men- 

 tioned. I think that 3Ionticulipora Dalei and Monticulipora approxi- 

 mata are good species, always separable, without the aid of a magnifier, 

 and occupying, in part, a different range of rocks. 



Arthraria hiclavata (n. sp.) A 



This fucoid consists of a straight cylindrical stem, with an enlarge- 

 ment at each end, nearly as round as a ball. It has some resemblance 

 in shape to dumb-bells. It shows no structure. It usually consists of 

 the impression, only, in slabs — in this form, it is quite common, at the 

 quarries, on the top of the hill, at the east end of Eden Park, and at 

 the quarry, on McMillan street, near the residence of Mr. Stahl. 

 Sometimes, the cylindrical stem, between the balls, is found in tolera- 

 bly good condition, but it is quite rare to find even part of a ball in the 

 matrix, and I have never seen a specimen free from a slab. The 



