35 
Fig. Z5.—BLAST0IDS. 
Fig. 25 : a, Stcphanocrinus angulatus ; b, Nticleocrinus Vemeuili ; c, Pentrcmites pyriformis 
with stem ; d and e, top and side views of P. Godoni ; /, Granatocrinus Norwoodi, with column 
and tentaculae preserved. 
Examples of these forms may be found under the New York 
Niagara, in Alcove Case, No. 3 (Stephanocrinus) ; Case f, Sect. 7 ; 
in the Upper Helderberg group, Case h, Sect. 8 ; in the Burling- 
ton division of the Lower Carboniferous, Case m, Sect. 12, and 
in the Chester division, Case n, Sect. 10. 
ASTEROIDEA (Star-like). 
This group contains the true star-fishes, both fossils and living. 
They are not very common as fossils in the rocks of the Palaeo- 
zoic ages, but are sparsely represented in several of them. In the 
Trenton group, Alcove Case, No. 1, a single imperfect individual 
of Palczaster may be seen, and a very fine example in the Alcove 
Case, No. 2, under the Hudson River group. In the Lower Helder- 
berg group, Case F, Sect 10, under the name Proiaster Forbesi 
some examples of a very pretty little form may be seen. In the 
Hamilton group, Case 1, Sect. 2, other Palceasters are exhibited, 
and other very fine forms from the Keokuk limestone in Case n, 
Sect. 1, under the name Onychaster. 
