137 



Fig. 20. Monotrypa fruticosa. A specimen 

 of the natural size, and a portion of the surface 

 enlarged (after Hall.). 



(Hall.) (Fig. 

 Foss., Pis. 



21.) {Chsetetes 

 XXXVII. and 



of the branches; ealices of monticules larger than those on 



remainder of branches ; tab- 

 ulae remote, except near the 

 surface, where they are nu- 

 merous. 



Found in the Moscow 

 shale, three to five feet 

 above the Encrinal lime- 

 stone, at Section 5; also in 

 the Demissa bed of Section 

 5 ; between ten and fifteen 

 feet below the Encrinal lime- 

 stone, at Section 7, and in 

 the Pleuroclictyum beds of 

 Avery's Creek (rather rare). 



Monotrypa (?) furcata. 

 furcatus. Hall. 111. Dev 

 XXXVIII.) 



Distinguishing Characters.— branch- 

 ing form similar to the preceding, 

 from which it differs chiefly in the 

 absence of the monticules, and in the 

 transversely-ridged appearance of the 

 corallites. (On a number of speci- 

 mens, apparently of this species, 

 spines or acanthopores occur at the 

 angle of junction of the corallites, 

 a feature which would demand the 

 removal of the species to another 

 genus. See Ulrich, Paleozoic Bryozoa, 

 Palaeontology of Illinois, Vol. VIII., Part II., Section 6, 1890.) 



Found in the Demissa bed, at Section 5, and two to four 

 feet below the Trilobite beds, at Avery's Creek. 



Monotrypa amplectens. sp. now (Fig. 22.) 



Distinguishing Characters. — Encrusting habit; uniform, 

 rather large, and regularly distributed monticules, the calices 

 of which are larger than those of the main mass ; small, new 



Fig. 21. Monotrypa (?) fur- 

 cata. A specimen of the natural 

 size, and a portion of the 

 surface enlarged (after Hall ). 



