Family DTCHOCRINID.lv 



DICHOCRINUS BOZEMANEKSIS, 11. sp. 

 PIdIc III, yi<l- •/, (i~ij<joiis ricir (ifrdhj.v nnil arms. 



Species medium size. Calyx obcoiioitlal, nearly as high as wide. 

 Surface longitudinally lined or sculptured, hut this feature is not 

 shown in the illustration, because the u^jper surface of the calj'x is 

 worn and it would have to be supplied; some of the ornameutatiou 

 only, in the lower part of the specimen is ])reserve.d. Sutures not 

 imjjressed. Column small and round. 



The two basals form a little cu[) about twice as wide as hiiiii. It 

 is contracted above the bottom so as to \vn\v an exjjanded basal rini. 

 The first radials are a little less than twice as long as wide and very 

 slowly increase in width to the superior end, which bears a concave 

 facet about one-half the width of the plate for the attachment of the 

 ^ecoud radial or first brachial. Second radial short, rounded. Third 

 radial about the size of the seconil. i)eiitagonal, axillary and supports 

 upon the upper sloping sides the free arms, The arms bifurcate on 

 the third plate, giving four arms to each ray. There are, therefore. 

 twenty aruis in this species, jjrovided oidy. that the ray opposite the 

 azygous i)late, which cannot be seen in our specimen, is like the 

 others. The arms are long and com])nsed of a single series of cunei- 

 form )>lates. each one of which bears a long, coarse ])inuule. The 

 vault cannot be seen in our specimen. 



Found in the Tapper Burlington or T.,()wer Keokuk, on Bridger 

 Mountains, near Bozeman. IMontana, by l']arl Douglass, and now in 

 his cnliection. 



TALAUOCinXI'.'^ I>ATKI. II. Sp. 



Plate I fl, Fit/. 9. vicir oppoxile llic (tzijuons .■</'/<' of <i larf/e speci- 



iiioi: Fiji. UK (iiifijoiis i:i(lc of same; Fl)/. It, (izijgous sidii 



i)f it t^inoU spcciiiien, pldli'fi of Ike vault, thoiuih 



preserrcd, arc not iiii lira led; Fif/. 1'2, 



opposite vieic of same. 



We have ten s))ecimens belonging to this species, the smallest of 

 which is not half as large as the smaller one illustrated: the larger 

 one illustrated is the largest in the collection. 



General form of the calyx ami vault, somewhat obovate. Calyx 

 broadly truncated and scnnewlial in the form of the frustum of a cone. 



