SILURIC FAUNA FROM SOUTHERN MICHIGAN 547 



E. Fauna of the Anderclon bed of the salt shaft (ss). and the Anderdoii 

 quarry (a.q.). — Unless speoifiecl, the species occurs in both localities. 



STROMATOrOROIDS : 



1. CJathroOictyon ostiolatutn NicKolson, abundant ; a Guelph and CoblesklU species. 



2. Stromatopora yultense (Dawson), abundant ; a Guelph and Cobleskill species. 



3. Stylodictyon slierzeri, Grabau manuscript, ss., the only Siluric representative of 



the genus known'; closely related to species from the Columbus limestone 

 and from the Traverse beds of Michigan. 



4. Glathrodictyon variolare v. Rosen, ag.; a Siluric type, rather common. 



5. Cwnostroma pusttilosidii, Grabau manuscript, aq.; an abundant form. 



6. Idiostroma nattiessi, Grabau manuscript. A small branching species, closely 



similar to, if not identical with those abounding in the Traverse group of 

 Michigan. 



Anthozoa : 



7. EelentoropJi-yUiim caliculoides Grabau manuscript, gen. et sp. Like Eiiteio- 



lasma caliculum, of the Niagara, but with carinse on the septa ; not uncom- 

 mon ; aq. 



8. Cyathophyllum cf. thoraldense Lambe ; rare ; ss. 



9. Cyathophyllum americanum, mut. anderdoneiise Grabau manuscript. Differs 



from the species in Its somewhat more concentrated large cysts ; com- 

 mon ; aq. 



10. Synaptophyllum multicaule CBslW) , 



11. Diplophyllum integirmeiitiim Barrett. A characteristic species of the Decker 



ferry beds of New Jersey ; common. 



12. Ceratopora tenella (Rominger) ; common ; aq. 



13. Favosites basaltica var. nana Grabau manuscript; common; ss. ; a form differ- 



ing in nothing but size of corallites from the typical Columbus limestone 

 species. 



14. Favosites rectangiilaris Grabau manuscript; common; a digitate species with 



the corallites turning at nearly right angles. The species has squamulae like 

 the Devonic species. 



15. Cladopoia hifurcata Grabau manuscript ; an abundant form of Siluric affinities. 



16. Favosites concava Grabau manuscript; a common form; aq. 



17. Syi'ingopora microf undulus Grabau manuscript ; not unlike 8. iiifiindibulum 



Whitfield, but very much smaller ; rare ; ss. 



Brachiopoda : 



18. ProsseveUa modestoides Grabau manuscript ; gen. et sp. A genus which so far 



appears to be confined to the Upper Monroe ; is characterized among other 

 features by two strong but closely parallel, rarely uniting septa in the 

 pedicle valve. Its nearest allies are found in the Middle Devonic of Europe. 

 P. modestoides is common in ss.. is large for the genus, and non-plicate; a 

 related form apparently occurs in the Guelph. 



19. Prosserella lucasi Grabau manuscript ; rare, but aluindant in Lucas dolomite. 



Pelecypods : 



20. Coiiocardiiim monroense Grabau manuscript ; a species very closely i-elated to 



C. trigonalis of the Schoharie grit ; common. 



Gastropods : 



21. Eotomaria galtensis (Billings) '1 ; an impression referred to this species ss. 



22. Plcurotomaria cf. velaris Whiteaves ; an imperfect form of this type. 



F. Fauna of the Amhersthiirg bed. — This is best known from the dredging in 

 tlie Detroit river opposite Aiuher.stlmrj,', Ontario, where tlie Reverend Mr Nat- 

 tress made an extensive collection. It is also known from tlio Patrick, (iihnii- 

 tar, and Woolmith quarries. 



