OcT., 1907. NEw CRINOIDS — SLOcoM.  ° 295 
thick, more or less sculptured plates with edges beveled forming 
furrows in which the sutures are situated. As none of these species 
has been found with the arms preserved, it is not possible to state 
whether they are simple or branched, but the number of the arm 
bases and the thickness and ornamentation of the plates indicate 
their affinity with Habrocrinus. Inthenew species described herewith 
both the typical form of Habrocrinus and the form referred to Piono- 
crinus are found. 
HABROCRINUS BENEDIcTI 8S. A. Miller, Plate LXX XVII, Figs. 6-7. 
1892 Saccocrinus benedictiS. A. M., Adv. Sheets, 18th Rept. Geol. 
pure oind> p. 28) Pl. -V.,- Figs: -1=—2. 
1894 Saccocrinus benedict S. A. M., 18th Rept. Geol. Surv. Ind., 
p. 283, Pl. V, Figs. 1-2. 
1902 Periechocrinus chicagoensis Weller, Bull. 4, Nat. Hist. Surv., 
Chicago Acad. Sci., p. 131, Pl. XIII, Figs. 7-8. 
The specimens described by S. A. Miller as Saccocrinus benedictt 
had the plates preserved, so that their form and ornamentations 
were well shown. The specimens were from St Paul, Indiana. 
Pertechocrinus chicagoensis was described by Weller from natural 
casts from Chicago, no specimens showing the ornamentation of the 
plates having at the time been reported. 
In the summer of 1906 the writer was fortunate enough to find a 
natural cast of P. chicagoensts accompanied by a large part of the nat- 
ural mold. Upon taking an impression of this mold a great simi- 
larity with P. benedictt was at once apparent, and upon further study of 
the two forms there appeared little reason to doubt that they were 
specifically identical. , As Miller’s species has about ten years priority, 
P. chicagoensts Weller will thus become a synonym. Wachsmuth & 
Springer consider H. benedictt to be a synonym of H. ornatus. This 
view is not held by many other authors and a comparison of the 
type of H. benedictt with the drawings of H. ornatus would seem to 
leave little room to doubt that they are distinct. 
Locality: Niagaran limestone of the spoil heaps along the Chicago 
Drainage Canal near Lemont, Illinois. The specimen here figured — 
has the Museum number P 8893. 
‘The bibliography of the two other species transferred to Habrocrinus 
is here given, although they have not been reported from this Area. 
HABROCRINUS HOWARDI S. A. Miller. 
1892 Saccocrinus howard §. A. M., Adv. Sheets, 18th Rept. Geol. 
Siw ides hare eb wv, igs, 3-9. 
