OLAUK.J buUKaL'ETlORlNUa ALABAMENSIS. '26 



BOUEGUETIOHIKUS D'Oibigny. 



BOURGUETICRINITS ALABAMENSIS de Loriol. 



Plate III, ri{>s. la^e. 



BourtnietUr'uuis ahibameiisin dc Loriol, 1882. Cinciuiiati Soo. Nat. Hist. Jour., vol. 

 V, ]i. 118. PI. V, Fijr. 1, la, n. 



As it has been impossible for the writer to obtain possession of the 

 type of this species the description of de Loriol, as translated by Prof. 

 S. A. ]\Iiller, is given verbatim: "This species is as yet known only 

 by the basal ccme which snpi)orts the calyx, and which is composed of 

 several eularo-ing" segments of the column surmonnted,by the basal 

 plates. The height of the iiiverted cone is 5"""; the diameter of the 

 basal idate is 3i""", and that of the inferior segment of the column is 

 3""" in its major axis. Its form is faintly swollen in the middle; the 

 surface is smooth. The sutures are very indistinct, and it is a difticult 

 matter to determine what was the height of the basal plate. The su- 

 perior face of the cone cairies five slender and comparatively elevated 

 radiating ridges, which bound five deep depressions in which the basal 

 pieces of the calyx were lodged; in the center an enlargement of the 

 central canal constitiites the bottom of the calyx cavity. The articu- 

 lar face of the lower Joint of the column forming the inferior end of the 

 cone is elliptical, but the length of its major axis does not, however, 

 much exceed that of its minor axis. It is slightly concave and eucir- 

 cle<l by a feeble rim along the circumference line; the transverse articu- 

 lar ridge process is reduced to two elongated tubercles which proceed 

 from the marginal rim. Central canal comparatively large." 



EeJatcd forms. — "Although this species is still very imperfectly 

 known one can aftirm that it is certainly distinct from BonrgucH- 

 cHnus elUjJticusMiWerj by the much less swollen form of the basal cone, 

 which is but slightly convex in outline, and by the facts that the lower 

 segment of the cone is already elliptical and already i)ossesses the rudi- 

 ments of a transverse articular ridge. Furthermore, the radiating 

 carinas are very much more salient, and consequently the depressions 

 which they separate very much deeper. Finally, by its central canal 

 being relatively much larger." 



Locality and geological horizon. — " Livingstone, Alabama, liipley 

 Grouj) of the Cretaceous, or at the top of the Kotten limestone." 



Collection. — Cincinnati Society of Natural History. 



PENTACRINID^. 



Calyx small, "composed of five basals and five radials with under- 

 basals in one genus. The rays divide from one to eight times. The 

 stems bear verticils of cirri at intervals. Two joints are united by 

 syzygy at each node, to the upper one of which the cirri are articulated. 



