Oct., 1907. New Cricoids — 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. In the new species described herewith 

 both the typical form of Habrocrinus and the form referred to Piono. 

 crinus are found. 



Habrocrinus benedicti S. A. Miller, Plate LXXXVII, Figs. 6-7. 



1892 Saccocrinus benedictiS. A. M.,Adv. Sheets, 18th Rept. Geol. 

 Surv. Ind., p. 28, PI. V, Figs. 1-2. 



1894 Saccocrinus benedicti S. A. M., 18th Rept. Geol. Surv. Ind., 

 p. 283, PI. V, Figs. 1-2. 



1902 Periechocrinus chicagoensis Weller, Bull. 4, Nat. Hist. Surv., 

 Chicago Acad. Sci., p. 131, PI. XIII, Figs. 7-8. 



The specimens described by S. A. Miller as Saccocrinus benedicti 

 had the plates preserved, so that their form and ornamentations 

 were well shown. The specimens were from St Paul, Indiana. 

 Periechocrinus 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: chicagoensis accompanied by a large part of the nat- 

 ural mold. Upon taking an impression of this mold a great simi- 

 larity with P. benedicti 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. chicagoensis Weller will thus become a synonym. Wachsmuth & 

 Springer consider H . benedicti to be a synonym of H. ornatus. This 

 view is not held by many other authors and a comparison of the 

 type of H. benedicti 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 P8893. 



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 howardi S. A. M., Adv. Sheets, 18th Rept. Geol. 

 Surv. Ind., p. 29, PI. V, Figs. 3-5. 



