CLASS II HYDROZOA— GRArTOLITOIDEA 131 



outline and rounded extremities, ornamented with two rows of isolated spurs ; 



Pig. 205. 

 o, c, Climacograptustypicalin Hall. Orfloviciaii (Tieii 

 ton limestone) ; Cincinnati, Ohio ; a, Vertical section 

 sliowinj; common axis In the centre, enlarged ; h, I'oly 

 pary of the natural size ; c. Cross-section, enlarged 

 (I, e, IHjiIoijraptus palmeus Barr. Silm-ian ; Prague ; d. 

 Folypary of the natural size; e, Polypary enlarged 

 /, DiiihxjraptHS foliacens Murch. Silurian (LlaiKleilo 

 Group) ; Scotland. Natural size. 



Fifi. 20i;. 



DiplograplusfoHaceiis Hall.'Utica shale (Ordovician); 

 Dolgeville, New York. Synrlial)dosonie showing 

 central organs and primary disk (hi) with funicidus 

 (/), to which the rhabdosomes (c) are attached by a 

 slender nemacaulus («). Gonangia (;/) with young 

 siculae (s) are also present, x % (after Ruedemann). 



Glossographhs quadrimucronatus Hall var. approxinatus 

 Rued. Utica shale (Ordovician); Dolgeville, New York. 

 Syurliabdosome. x i/i (after Ruedemann). 



Fio. :iOS. 



Glossograptus qnadnmucronatus (Hall) 

 var. approximates Rued. Utica shale 

 (Ordovician) ; Dolgeville, New York. 

 Young .synrhabdosome showing central 

 disk and siculae. xS/i (after Ruedemann). 



each theca with two long spines. Ordovician. Eetiographts Hall ; Lasiograptus 

 Lapworth. Ordovician. 



