REPORT OF THE 



Localities — i ">*kL Rapids, Stone Island, (Saginaw Bay.) 



253. Cyathophylium, 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 styliform elevation in the cup of this large coral 

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

 after careful examination, 1 am convinced that the coral pos- 

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

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

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

 only differs in having the transverse floors more numerous 

 in the visceral chamber. 



Locality — Pt. au Gres. 

 248. Syringopora, sp? 

 Tubes small ; much geniculated and with numerous oblique 

 connecting .tubes or bars as large as the main tubes. Avery 

 characteristic fossil, but very obscure. 



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

 and Little Charity Islands. 



ECHINODERMATA. 



236. Archseocidaris. 



Remains of spines only, which more resemble Half's figures 

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

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



Locality — Grand Rapids. 



BRYOZOA. 



238. Fenestella membranacea (?), Phillips. 



Very closely related to Gorgonia (Rclepora) membranacea, 

 Phillips and DeKoninck. The fenestrules, however, are but 

 little longer than broad. 



Locality — Grand Rapids. 



339. Fenestella, sp.? 



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

 ted and less quad angular. A distinct, sharp keel runs along 

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

 disposition of the cellules is a miniature representation of 



