153. CONTRIBUTION TO 



The two large anterior plates of the first ring which we stated as located 

 inter-ambulacrally meet along a suture, mid-anibulacrally. 



The centers of the first ring of plates and each ambulaeral plate is occu- 

 pied by a node and these nodes on the ambulacra! plates are connected by in- 

 distinct ridges. Otherwise the vault plates are thickly set by granular-like 

 nodes. 



The ornamentation of this fossil is sharper than on any Dolatocrinus we 

 have 3^et seen. 



The {irms are fifteen in number. No respiratory slits. 



This specimen differs from Miller and Gurley's species D. preciosus only 

 in stronger ornamentation and different arm arrangement, agreeing in number 

 of arms. 



This species conies from the Upper Devonian beds, near Charlestown, Ind., 

 and the specimen figured belongs to the collection of Mr. G. K. Greene. 



DOLATOCRINUS PRECIOSUS, M. & G., Rowley. 



Plate 45, Figs. 4, 5, 6.  



The specimen here figured is somewhat larger than the proceeding form, 

 hardly less depressed, with a very shallow basal funnel and strongly elevated 

 ambulaeral areas. 



It differs from D. preciosus in arm number and formula, and the character 

 of tlie dorsal ornamentation. 



The radiating lines of nodes, so prominent on />. prec/iosus^ here become 

 lines of confluent nodes about the base but differing a little higher up. 



The arms are sixteen in number and have the arrangement, 3, 3, 4, 3, 3, 

 beginning :tt the anal area and passing around the periphery toward the right, 

 the lobe with four bases being the anterior one. No respiratory pores. 



Anal tube as in the preceding form. 



Horizon, locality and collection, same as the last. 



DOLATOCRINUS C H A R L E S T O W N E N S I S , M. & G., Rowley. 



Platk 45. Figs. 7, 8, 9 



This crinoid is depressed as usual in the genus, the basal flattening begin- 

 ning with the top of the second radial plates. 



A rim surrounds the stem base and a rounded ridge passes up the middle 



I 



