PLATE XI. 



PAUR. 



Platycrinus Hichfieldensis 167 



Fig. 1. View of the apecimen described, very slightly rcs' ored in the i-f gioji of the radial plalew. 



Platycrinus graphicus .' 166 



Fig. 2. View of iho specimen, showiitg the platf s of the horly broken and crushed, and ^living form 

 and mode of bifarcatiofls of the anas as described. 



Platycrinus Lodenris 168 



Fig. 3» Vipw of the specimen described, showing the strong arm bases nnd the mode of liifnrcalion. 

 The basal plates are somewhat brokeu In the specimen, and are slightly i-estored in the 

 fijure. 



Platycrinus contkitus ' 16t5 



Pig. 4. View of a specimen of this specips, wliich shoAve the peenlinr foim of ihe l)ns;d plates. The 

 arms are preserved for about half their extent, and show the mode of bifurcation. 



ACTIXOCRINUS HELICE 163 



Fi'4s. 5 and 6 are two tI^-ws of a Apecimen roprusenting the variety of the sprciort \\ hero the arm for ra- 

 ulaiaS, 3 4, 4 4. 

 7 and 8 i-epresent a specimen having tho normal number of arms, the formnla being 2, 2 ', 4 4. 

 and 10 repieaent an Individual of the vaiiety Eris, in which the ann formula is 2, 2 2, 3 '-i. 



AcTixocRiNUs Daphne 162 



Fig. II represents one of the specimena described, oni show.s several of the plates < f the body ar- 

 ranged in their natui-al order. At the upper part the plates are pushed over the arm base 

 slightly, partly obscuring the bifurcations i f the arms. 



ACTINOCKINUS VIMINALIS 165 



Fig. 12 shows an individual preserving a part of the body plates, together with most of the arms and 

 ten tn on la. 



13. Tinw of another individual, spread out upon the siirfaffl of the shale so as 1o show a very 



good (liaLcram of thn body, and illnstr-ites ihe m')do of bifiiroa'ion of the arms. 



14. Diagram showing th structure of thn arm ai. one of the bifurcations. 



