104 REPORT OF THE 



Localities — Grancf Rapids, Stone Island, .(Saginaw Bay.) ^ 



253. Cyathophyllum, sp? 

 More expanded than the preceding, and more irregular in its 

 outline. 

 Locality — Grand Rapids. 



251. Caryophyllia duplicata, Martin. 

 Agreement very good. 



Locality — Great Charity Island. 

 249. Acervularia, sp? 

 The obscure st} liforni elevation in the cup of this large coral 

 strikes the eye at first as belonging to a Lithostrotion, but 

 after careful examination, I am convinced that the coral pos- 

 sesses no columella As far as its characters can be inspec- 

 ted, it does not differ from Strombod.es, as restricted by Pictet. 

 It has the general aspect, however, of an Acervularia, and 

 " only differs in having the transverse floors more numerous 

 in the visceral chamber. 



Locality — Pt. an Gres. 

 248. Syringopora, sp? 

 Tubes small; much geniculated and with numerous oblique 

 connecting tubes or bars as large as the main tubes. A very 

 characteristic fossil, but very obscure. 



Localities — Grand Rapids, Pt. au Gres, Wild Fowl Bay, Great 

 and Little Charity Islands. 



ECHTNODERMATA. 



236. Archaeocidaris. 



Remains of spines only, which more resemble Hall'6 figures 

 of A. Agassizii, (Burlington Limestone,) and A. Keokuk, 

 (Keokuk Limestone,) than any others accessible to me. 

 Locality — Grand Rapids. 



BRTOZOA. 



238. Fenestella membranacea {1), Phillips. 



Very closely related to Gorgonia (Reteporaj membranacea, 

 Phillips and DeKoninck. The fenestrules, however, are but 

 little ionger than broad. 



Locality — Grand Rapids. 

 339. Fenestella, sp.? 



Similar to the preceding, but the fenestrules are more elonga- 

 ted and less quadangular. A distinct, sharp keel runs along 

 the ray between the two rows of cellules. The form and 

 disposition of the cellules is a miniature representation of 



