754 THE CEmOIDEA CAMEEATA OF NORTH A5IEEICA. 



like protuberance, or at the outer end of a short conical tube. Column 

 round ; axial canal minute. 



Distribution. — This genus is largely represented in, and nearly to the 

 close of, the Carboniferous, both in America and Europe ; but not a solitary 

 species is known from the Devonian, nor from the Coal measures. 



Tyjie of the genus : Dickocrimis radiatus Miinster. 



Eemarks. — There has been some difference of opinion as to the number 

 of " primary radials " in Dicliocrinus. The Austins rejDresent their D. fusi- 

 formis * with three costals, and De Kouinck and Le Hon, in their generic 

 formula, fix the number of "primary radials" at four, on the strength of 

 Austin's figure. Shumard, on the other hand, describes two of his species, 

 D. cornigerus and D. sexlolatus, with a single large radial followed directly 

 by the distichals. Casseday and Lyon give the number of "radials" as one 

 to three, and with this Meek and Worthen agree. 



From a careful examination of extensive material, we are convinced that 

 all species of Dichocrinus have three so-called radials, i. e. two small costals 

 above the radial, united by syzygy ; but that D. cornigerus, D. sexlohatus, 

 and the other species for which we proposed the genus Talaroainus, have 

 but one, and this so extremely small that it was overlooked by Shumard. 



The genus Cotyledonocrinus Casseday and Lyon is based on incorrect 

 observation. Examination of the type specimens shows that C. pentalobus, 

 the type of the genus, has two basals, followed by a ring of six plates, and 

 not by five as described by the authors. 



Dichocrinus lachrymosus Hall. 

 Plate LXXVII. Figs. 2a, h, c. 



1859. Dichoerimis lachrymosus — Hall; Suppl. Geol. Eep. loTva, p. Si; figured Bull. I. N. Y. State 

 Museum of Nat. Hist., Plate lA, Fig. 11. i 



18S1. Flatycrhius subspinulosus — W. and Sp. ; Revision Palffiocr., Part II., p. 75. 

 1885. Dichocrinus lachrymos-us — W. and Sp. ; ibid., Part III., p. 119. 



A rather large and grotesquely ornamented species. Calyx large in 

 proportion to the size of the arms, broadly conical, as wide as high ; sides 

 rapidly and uniformly spreading from the base of the basal cup to the base 

 of the brachials; the radials rounded on the back, producing angular depres- 

 sions along the suture lines. Surface of plates covered by series of prominent 

 wart-like processes of abrupt and irregular form, those of the same plate 

 being generally confluent. On the basal cup, these processes occupy the 

 lower end, there being two or three of them to each basal, each set separated 



» Eec. and Foss. Crin., Plate 5, Fig. 65. 



