402 The CalceocrinidcB, 



azygous, to form the arch around the curved side of the consolidated 

 basal. They also receive between them the first anal lying immediately 

 upon the azygous. 



Their upper and outer sides support the first axillary pieces of the 

 lateral arms. 



Lateral arms, formed of from three to five axillary pieces arranged 

 in succeeding order, with their inferior borders resting upon the anal 

 plates and uniting (?), or nearly so, above them in the middle of the 

 ventral side. Their upper ends each give rise to an arm or branch. 



Type of genus : Calceocriiius typus Ringueberg. 



It will be observed from the above description, and the dia- 

 gram given of Calceocrinus typus, that Ulrich's genus ffaly- 

 siocrinus agrees in all of the major points with the typical Cal- 

 ceocrinus, of which it must in all probability rank as a synonym. 

 This will also probably be the case with his Deltacrinus, unless 

 other and more important structural differences should be noted 

 besides the number of axillaries upon which he bases his genus. 



Calceocrinu§ typus n. sp. 



PI. X., Fig. 8. 



Surface finely granulose, calyx flattened anteriorly; somewhat de- 

 pressed and constricted in the centre of that side; rather square in out- 

 line; upper portion but little narrower than the lower; ventral side 

 very gibbous, with a notch or depression to receive the upper end of the 

 column. 



Column round, composed of nodose joints which are as high as wide. 



Consolidated basal piece evenly semicircular in outline, with the col- 

 umn attached just inside the posterior margin; anterior anchylosed 

 basal half as wide as the base line. Anterior radial almost equilate- 

 rally triangular; somewhat wider than the anchylosed basal, but not 

 quite so wide as the base of the calyx. Lateral radials large and anchy- 

 losed to the posterior radials; they form the lateral thirds of the arch 

 around the consolidated basal piece on the posterior side, the low and 

 broad azygous occupying the median third. 



Azygous wide, slightly lower in the middle on account of the upward 

 curvature of the lower margin receiving the basals, and a downward 

 curvature of the upper margin for the reception of the anal. 



First anal broad, low, with outer ends turned up abruptly, and re- 

 ceiving between them the broad base of the truncate pyramidal second 

 anal; other anals, if any, unknown. 



Anterior brachial extending somewhat beyond the upper angles of 

 the lateral radials, pentagonal, and having its upper margin hollowed 

 out to receive the first arm-joint. 



