PA1M30NT0L0GICAL REPORT OF GEOLOGICAL SURVEY. 479 



ty, associated with P. obesus, Asterocrinus capitalis, A. coronarius, &c. 

 Ranging rather higher in the bed than either of the others. The verti- 

 cal range is not known. It has not, so far as we are informed, been 

 discovered in any other geological horizon. 



A CTINO CRINUS. Miller. 



This genus was established by Miller in 1821, and was defined as 

 follows: 



"A crinoid animal, with a round column, perforated by a round ali- 

 mentary canal. At the summit of the column is placed a pelvis, formed 

 of three plates, on which five costals, and one irregular, adhere; which 

 are succeeded by the' second costals and intercostals, and the scapulae, 

 from whence five arms proceed, forming two hands, with several tentac- 

 culated fingers. 



Bound side-arms proceed at irregular distances from the column, 

 which terminates at the base in a fassicular bundle or roots of fibres." 



Recently De KoninckandDe Hon, in treating of this genus, have 

 adopted a different nomenclature. The Actinocrinus, as defined by 

 these authors, is as follows : 

 Generic Formula: 



Basal pieces, 3, of a quadrangular form. 



Radial pieces, 3x5- 



Interradial pieces, 3x4. 



Anal pieces, 6. 



Brachial pieces, 1, or 2x5- 



Column, cylindrical; canal, pentagonal. 



ACTINOCRINUS ABNORMIS. Lyon. 

 (Plate IV. fig. 1, la, 16.) 



Body. The general form of the most symetrical of this species is 

 sub-globular; others are quite shallow; saucer shaped ;, with a very low, 

 irregular; covering in others the circle of the body, at the insertion of 

 the arms, is deeply emargihate. The form of the inferior part of the 

 calyx is constantly that of a shallow rounded cup, slightly indented 

 around the columnar pit. The basal pieces, and the radials of the 1st 

 and 2nd series, are also constant characteristics. 



The superior surface has a continuous covering, composed of small 

 pieces; the spaces opposite the junction of the arms with the body have 



