26 Talbot — New York Ilelderbergian Crinoids. 



ing two rows of disticlials, three in each row. The last distichal 

 supports two rows of palmars, whose first two plates are con- 

 nected. Above this point, the palmars separate, those on the 

 outside of the raj forming an auxiliary arm which lies alongside 

 the raj but is not connected with it. The inner row of palmars 

 joins corresponding plates from the other row of distie.hals to 

 form a tubular appendage which extends for a short distance 

 only, when the divisions separate- and remain apart to the end of 

 the raj. On the outer side of the raj, arms arise from everj 

 fourth or fifth joint; but, on account of the length of the 

 joints, the arms are quite far apart. The arms are biserial to 

 the end. The first interbrachial is large, hexagonal, followed 

 bj a double row of alternating hexagonal plates. Anal inter- 

 radius wider and ending in a short thick tube or sac, composed 

 of numerous plates which seem to have been hexagonal orig- 

 inallj. This sac is seen in but one specimen, where the plates 

 are verj poorlj preserved (text-fig. 2). Column circular, with 

 diameter large in proportion to the size of the caljx. Distallj 

 the joints alternate in size, but near the caljx thej are verj 

 thin and of uniform thickness. 



Horizon and locality. — Upper third of the Coejmans lime- 

 stone at North Litchfield. 



Cotypes in the Yale University Museum. 



Genus, Melocrinus Goldfuss. 

 Genotype, Mariacrinus nobilissimus Hall. 

 Melocrinus nobilissimus (Hall). Plate II. 



Mariacrinus nobilissimus Hall, Nat. Hist. N. Y., Pal., vol. iii, 1859, p. 

 105, pi. 2, figs. 1-5 ; pi. 2A, fig. 1. 



Melocrinus nobilissimus Wachsmuth and Springer, Eev. Palaeocr., Pt. II, 

 1881, p. 122 ; Proc. Phila. Acad. Nat. Sci., vol. xxxiii, 1882, p. 296 ; N. Am. 

 Cri. Cam., vol. i, 1897, p. 295 ; Atlas, pi. xxiii, figs, la, 2 and 3.— Bather, A 

 Treatise on Zoology, 1900, Pt. III. The Echinoderma, p. 161, text-fig. 

 lxxiv, 2. 



Sixteen individuals of this species have been added recentlj 

 to the Yale collections ; yet, since the tjpe specimen is so nearlj 

 perfect, verj little additional knowledge has been gained from 

 this new material. Attention, however, maj be called to a few 

 points. One specimen shows a row of three or four small 

 plates between the auxiliary arm and the tubular appendage. 

 These plates appear in the figures given by Wachsmuth and 

 Springer, but no mention is made of them in the descriptions. 

 Thej seem to be interpalmars, though it is possible that thej 

 belong to the ventral disk. The domelike extension of the anal 

 series of plates, which is also figured bj Hall, is seen indis- 

 tinctly in one specimen. One crown has a column attached, 

 over 21 cm in length ; while another column on the same slab, 

 and to all appearances of the same species, is over 69 cm long 

 and gives no indication of proximity to either caljx or distal end. 



