EAELY PALEOZOIC BEYOZOA OP THE BALTIC PROVINCES. 



31 



of the Clitambonites bed to the Wesenberg hmestone has been 

 remarked upon in a preceding paragraph. 



BEYOZOA OF THE CLITAMBONITES BED. 



*Stomatopora arachnoidea (Hall). 

 *Corynotrypa delicatula (James). 

 *Corynotrypa inflata (Hall). 

 Ceramoporella interporosa Ulricli. 

 *Rhinidictya mutabilis Ulrich . 

 *Pachydiciya elegans Ulrich. 

 Pachydictya acuta Hall. 

 *Graptodictya proava (Eichwald). 

 Escharopora recta Hall. 

 Phsenopora incipiens Ulricli. 

 Arthropora bi/urcata Ulricli. 

 Arthropora reversa Ulrich. 

 Helopora mucronata Ulrich. 

 Arthroclema pulchellum Billings. 

 Monticulipora arborea Ulrich. 

 Monticulipora cannonensis Ulrich. 

 ^Homotrypella hospitalis crassa Ulrich. 

 Eomotrypella ovata Ulrich. 



Homotrypella mundula Ulrich. 

 *IIomotrypa subramosa insignis Ulrich. 

 *Ho7notrypa similis Foord. 

 Homotrypa callosa Ulrich. 

 Prasopora insularis Ulrich. 

 Aspidopora elegantula Ulrich. 

 *Eridotrypa sedilis (Eichwald). 

 *Eridotrypa aedilis minor Ulrich. 

 Dekayella trentonensis Ulrich. 

 *IiaUopora multitabulata (Ulrich) 

 Hallopora ampla (Ulrich). 

 *Hallopora goodhuensis (Ulrich). 

 Calloporina crenulata (Ulrich). 

 * Hallopora dumalis (Ulrich). 

 Batostoma humile Ulrich. 

 *Hemiphragma irrasum Ulrich. 

 *IIeviiphragma tenuimurale Ulrich. 

 Leptotrypa acervulosa Ulrich. 



The two next faunal zones of the Minnesota-Trenton, the Nemato- 

 pora bed and the Fusispira bed, have been combined in the Hst of 

 bryozoan species herewith given. It will be noted that of the 40 

 species in these beds only 14 are common to the American and Baltic 

 areas. No bryozoans have been found in the Maclurea bed which 

 terminates the Minnesota-Trenton. The next overlying rocks are 

 of earliest Silurian (Uichmond) age, and contain the fauna of the 

 upper Lyckliolm and Borldiolm limestones, at least so far as the 

 bryozoans and corals are concerned. 



BEYOZOA OF THE FUSISPIRA AND NEMATOPOEA BEDS. 



*Stomatopora arachnoidea (Hall). 

 *Corynotrypa delicatula (James). 

 *Corynotrypa inflata (Hall). 

 Berenicea minnesotensis Ulrich. 

 Diastoporina flabellata Ulrich. 

 Favositella laxata Ulrich. 

 Cceloclema trentonensis Ulrich. 

 *Mitoclema ? mundulum Ulrich. 

 Rhinidictya exigua Ulrich. 

 Rhinidictya minima Ulrich. 

 Pachydictya pumila Ulrich. 

 Pachydictya acuta Hall. 

 Pachydictya Tnagnipora Ulrich. 

 Nematopora conferta Ulrich. 

 *Nematopora consueta Bassler. 

 Nematopora granosa Ulrich. 

 *Nematopora ovalis Ulrich. 



Helopora quadrata Ulrich. 

 Helopora mucronata Ulrich. 

 * Arthroclema armatum Ulrich. 

 * Chasmatopora reticulata (Hall). 

 Monticulipora grandis Ulrich. 

 Prasopora simulatrix Ulrich. 

 Prasopora selwyni Nicholson. 

 Prasopora oculata Foord. 

 Prasopora affinis Foord. 

 Homotrypa callosa Ulrich. 

 *Homotrypa similis Foord. 

 Mesotrypa quebecensis Ami. 

 Mesotrypa discoidea Ulrich. 

 Mesotrypa ? rotundata Ulrich. 

 *Eridotrypa sedilis (Eichwald). 

 *Eridotrypa exigua Ulrich. 

 *Hemiphragma tenuimurale Ulrich. 



