OF DENISOX UNIVERSITY 



PLATE XIII. 



Fig. I. /%ar^/j- ^^'^7/"//.^, ;/, j/; the head acci(leiually removed a li tie from 



the thorax in the rock. 

 Encrinurus Mitchelli, n. sp. part of the head missing 

 Encrinuriis Mitchellt, «. sp : a fragment, showing the laige tubercles 



at the dorsal furrow of the head ; a typical specimen. 

 Lichas Haiti, n sp. 

 Microdiscus piindalHs Salter ; head, Museum Com. Zoology, liar 



vard Univ. 

 SphcerexocJms viirus, Beyrich ; a glabella and fixed cheek. 

 Encriniirtis Bcrammgi, n. sp. glabella and fixed cheeks. 

 Liclias Trentonetisis, Conrad ; head, outline, Mus. Comp. Zool. 

 CyatJwphyttiun patida, 71. sp ; a cross- section of unusually wrinkled 



form. 

 Cyathopliytiiim patnta, n. sp ; the lower side of two polyps. 

 Cyathophytltint patula, n. sp. \ a few lamellae enlarged. 

 Fig. 12, Cyathoptiytltim atistratt ft. sp. the exterior of the calyces seen from a 



cast, partly restored.^ 

 CyaihophyitwH austrate 71. sp ; a cast. 



CyatJiopJiytttun atistrale 7i. sp; a few lamellae and grooves enlarged. 

 Cyat/iop/iyttuni Boto?it/zense^ Btai7ivitte ; a cross-section. 

 Ji7idopliyttnm [sptiotigoptiyltoides ? ) a cross-section. 

 EndopJiyttu77i ; the same, a vertical section. 

 Stro7id>ojdes pygiJicEus, RoDiwger ; part of a corallum collected by 



Mr. John Van Cleve. 

 Fig. 19, E7icti7turns pti7utatus, Brtmstoick ; a European specimen, figure taken 



from the wck Fr. Schmidt, on East Baltic Silurian Trilobites. 

 Fig. 20. E7ic7-i7i7irjis Mitchetti, 71. sp ; a moveable cheek. 

 Fig. 21. Ltc/ias brez'iceps. Had, lVatd7V7i. Indiana, Mus. Comp. Zool. 

 Fig. 22. Ptenrodictyiu7i probte/naiiciwi, Gotdftiss? \'iew of base of casts, '.he 



epitheca being gone. 



ERRATA. 



Page 12 2, instead o{ Encrinurus Broicningi rQ:\(\ E. Bcnvningi. 

 Page 132, instead o^ Spongopyl/oids read Spongop/iylioides. 



