PLATE XL 



PAGE. 



Platyckini's Richfieldensis 167 



Fig. 1. View of tlie si)ecimen de.scrilied, very sliglitly re.siored iu tlie legiou ot tlie radial plates. 



Platycrinus graphicus 166 



Fig. 2. View of the specimen, showing the ijlate.s of the body broken and crushed, and giving form 

 and mode of bifurcation.s of the arms as described.' 



Platycrinus Loden.sis 168 



Fig. 3. View of the specimen described, showing the strong aim bases and the mode of bifuicatiou. 

 The basal plates are somewhat broken in the specimen, and are slightly restored in the 

 figure. 



Platycrin'Us coxtritus , 166 



Fig. 4. View of a specimen of this species, which shows the peculiar form of the basal plates. The 

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



AcTINOCRINU.S HELICE 163 



Figs. 5 and 6 are two views of a specimen representing the variety of the species where the arm form- 

 ula is 2, 3 4, 4 4. . 

 7 and 8 represent a specimen having the normal number of anus, the formula being 2, 2 9, 4 4. 

 9 and 10 represent an indix-idual of the variety Eris, in which the arm formula is 9, 2 2, 3 3. 



Actinocrinus Daphne 162 



Fig. II represents one of the specimens described, auU shows severed of the plates of the body ar- 

 ranged in their natural order. At the upper part the plates are pushed over the armbase 

 slightly, partly obscuring the bifurcations < f the arms. 



Actinocrinus viminalis 165 



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

 tentacula. 



13. View of another individual, spread out upon the surface of the shale so as to show a very 



good diagram of the body, and illustrates (he mode of bifurcation of the arms. 



14. Diagram showing th'i structure of the arm at one of the bifurcation.s. 



