NATURAL SCIENCES OF PHILADELPHIA. 253 



This species will be readily distinguished from all others known to us, by 

 the peculiar little wart-like protuberances on the middle of each smbradial 

 piece. These are not incipient radial costae, nor properly nodes, but little 

 irregular pustular prominences like drops of melted wax. Some of them are con- 

 fluent, while others are distinct and irregularly grouped. They rarely extend 

 to the margins of the plates, and are almost entirely confined to the subradials, 

 though there are some faint indications of one or two on the lower half of one 

 of the first radials. 



This species is named in honor of Dr. R. D. Farley, of Jerseyville, Illinois, 

 to whom the Illinois Geological Survey is indebted for some interesting speci- 

 mens. 



Locality and position. Keokuk division of the Subcarboniferous series, 

 near Warsaw, 111. 



ACTINOCRINUS CALYCUUTS Var. HARDINENSIS. 



Although this little crinoid agrees so nearly with Actinocrinus calyculus, 

 Hall, that we are in doubt in regard to the propriety of considering it a distinct 

 species, the fact that it comes from the upper part of the St. Louis limestone, 

 while the A. calyculus holds a position in the Spergen Hill beds, 200 feet be- 

 low, taken in connection with the usually restricted range of the Crinoidea, 

 and some slight differences of structure mentioned below, cau-e us to place 

 it for the present, at least, as a distinct variety from the typical A. calyculus. 



In size, form, arm formula, surface markings, and most of its characters, it 

 agrees well with A. calyculus, from which it differs in the following details, 

 viz. : Instead of having but one or two interradial pieces to each space, the 

 first one much larger than the others, and ten or eleven sided, it has four or 

 five of these pieces to each interradial area, the first of which is not greatly 

 larger than the others and only six to eight sided. Again it differs in having 

 six anal pieces instead of but four, while its vault pieces are merely tumid 

 instead of " acutely spiniferous," excepting a few of those in the depressions 

 between the arm bases, which support little short spines. 



If Batocrinus should be separated from the genus Actinocrinus, this species 

 should doubtless be placed in it, as it has the general habit of the species of 

 that group, though its arm bases do not form a quite continuous series, the 

 intermediate spaces between those belonging to each two adjacent rays being 

 more deepling sinuous than those between each two of those belonging to the 

 same ray. 



Locality and position. Hardin County, Illinois, from the upper part of the 

 St. Louis division of the Subuarboniferous series, the highest position in 

 which the genus has yet been recognized in this country. 



Genus STROTGCRINUS, M. & W. 



Calathccrinus, Hall, (subgen. Actinocr.), 1861. Descript. Crinoidea, Prelim. 

 Notice, p. 12; (not Von Meyer, 1848, Leonhard and Bronn's Jahrb. p. 467.) 



The name Calathocrinus was proposed by Prof. Hall in the paper above 

 cited, for. a group including those curious species of so-called Actinocrinus, 

 with an obconic body and the summit more or less flattened and greatly spread 

 out in the form of a ten-rayed star, such as Actinocrinus perumbrosus, A. regalis, 

 Hall, &c. As the name Calathocrinus had, however, been previously used for 

 another type by von Meyer, in 1848, it becomes necessary to find another 

 name for our American group, and we have consequently proposed to call it 

 Strotocrinns, in the Report of the Illinois Geological Survey (p. 188), now in 

 press. It includes Strotocrinns perumbrosus, S. regalis, S.glyptus, S. erodus and 

 iS. lyratus, all of which had been described by Prof. Hall under Actinocrinus. 



Genus STEGANOCRINUS, M. & W. 

 We have proposed the above name in the Illinois Report (p. 195 ) now in press, 

 for a genus allied to Actinocrinus, with which it agrees in the structure of the 

 body, but differs in having the rays from the second or third primary radial pieces 



1866.] 



