142 SMITHSONIAN INSTITUTION 



thick. Maximum crown, 20 mm. high by 23 mm. wide at IBr ; 9 mm. by 22 mm. 

 at top of RR; width of basal cavity, 7 mm. 



IBB small, confined to the basal cavity, or visible only as points at the edge. 

 BB relatively large, partly entering the cavity. Anal x obtuse above, not rising 

 beyond level of radials ; RA small and variable. RR large, greatly increasing in 

 width to the upper face, and flattened, giving a distinct pentagonal perimeter. 

 Height of B to R to IBr, 6:7:2. IBr varying from 1 to 2; very short, but little 

 over a fourth as high as the radials, not increasing in width upward. IIBr 

 usually 4; one more bifurcation visible. Arms flat; brachials short and wide, 

 closing in a low pyramid about the third or fourth IIIBr. Column facet'deeply 

 indented, with sharp projecting rim outside the column. Column large, but not 

 filling basal cavity; proximal columnals short, tapering in width downward, 

 without alternation so far as preserved. 



The Eifel limestone is considered to be Middle Devonian, and the horizon of this species 

 is therefore above that of L. soyei, thus making it the last known survivor of the genus. It 

 is distinguished from that and all other species by the extreme spread of the calyx, as evi- 

 denced by the ratio figures of 1 to 2.5 height to width in an average of three specimens. The 

 pentangular calyx caused by the flattening of the radials at the upper part is also peculiar to 

 this form ; while in the very small infrabasals and sharply excavated basal cavity it departs 

 from the typical form of the genus. The brachials are the shortest and widest of any species, 

 and the irregularity in number of primibrachs is quite remarkable ; in the two specimens 

 having the arms preserved they are as follows, 2-1-1-1-1, 2-1 -2-2-1 ; so that one primibrach 

 is the most frequent number. The column is also very distinct, and shows the thin, tapering 

 proximal columnals so common to the group in general, but lacking elsewhere in this genus. 

 The radianal is almost wanting in the largest specimen, but normal in the other two. The 

 species is extremely rare. I was told by the old Lehrer Kroffges in Prum, who was one of 

 Schultze's principal collectors, that no specimens except those figured by Schultze were ever 

 found in his time. 



Types. The originals of Schultze's figures 8a, 8b, 8/_, 8g. are in the Museum of Com- 

 parative Zoology at Harvard College. That of his 8c is in the author's collection. 



Horizon and locality. Middle Devonian, Stringocephalen-kalk ; Kerpen, Eifel Moun- 

 tains, Germany. 



Lecanocrinus soyei Oehlert 



Plate III, figs. 27-29 



Lecanocrinus soyei Oehlert, Bull. Soc. Geol. France (3)X, 1882, p. 354, pi. 8, figs. 2-2/. — Wachsmuth and 

 Springer, Revision Palaeocrinoidea, pt. 3, 1886, p. 143. — Barrois, Mem. Soc. Geol. Nord., Ill, 

 1889, p. 327. 



A small species; complete crown unknown. Calyx conical, broadly trun- 

 cate below ; side outline straight or slightly convex ; average height to width at 

 top of RR, 1 to 1.4; cross-section circular; base truncate and excavate. 'Surface 

 ornamented with coarse tubercles visible to the naked eye, coalescing in places 

 into short wrinkles. Maximum specimen, 8.5 mm. high by 11.5 mm. wide at top 

 of RR;.base at column facet, 5 mm. 



