38 BULLETIN 65, UNITED STATES NATIONAL MUSEUM. 



Horizon and local'ttij. — Niagara (ioloinite, Hamilton, Ontario. 

 Collector, Col. C. C. Grant. 



Ilolotype. — Collection of A\'alker Museum, University of Chicago, 

 No. 13505. 



Genus C ALYPTOGRAPTUS Spencer. 



Cdli/iifofjifipsus Spknckr, Canadian Nat.. VIII, ISTS, p. 4oS. 



CaliipUxjraptus, Lapvvorth, Qnart. Journ. Geol. Soc. London, XXX\'ir, 

 ISSl, I). 173.— Spencer, Troc. Amer. Ass. Adv. Sci., XXXI, 1S,S3, p. ,3()4 ; 

 Trans. Acad. Sci. St. Louis, IV, 1884, pp. 562, 577; Bull. Mus. Univ. 

 State Missouri, I, No. 1, 1884, p. 27. — Miller, Nortli Amer. Geol. and 

 Pal., 1889, p. 175.— GuRLEY, Journ. Geol., IV, 1896, pp. 93, 308.- Ruede- 

 MANN, New York State Mus., Mem. 11, 1908, p. 163. 



Doctor Ruedemann" publishes the following on this genus: 



Spencer has erected the genus Cnlyptograptus for several species of the Ni- 

 as.'iran of Hamilton, Ontario, which are principally distinguished from the 

 similar genera, notably Dirti/oncDia and Co] log rapt us by the absence of trans- 

 verse dissepiments. In the first diagnosis it is stated that " in appearance and 

 texture this genus resembles Dirtyoncma. but the branches are [apparently] all 

 independent, not being connected by transverse dissepiments as in that genus 

 and are only united in one mass at the root" [although some of the branches 

 touching each other have occasionally all the appearance of connecting fila- 

 ments]. This statement has later (1884) been qualified by the same author by 

 the additions here placed in brackets, both of which tend to admit the occasional 

 presence of dissepiments. The absence of the dissepiments and the independ- 

 ence of the branches down to the root, which may be considered as additional 

 diagnostic characters of the genus, find their strictest expression in C. cyatlii- 

 fonnis the form which is cited as the genotype by Miller [X. Am. Geol. and 

 Pal. 1889, p. 175.] 



CALYPTOGRAPTUS CYATHIFORMIS Spencer. 



Calypiogrnpiux cyaihiformis Spencer, Canadian Nat., VIII, 1878, pp. 458, 

 460; Trans. Acad. Sci. St. Louis, IV, 1884, pp. 564, 578, pi. 3, fig. 3; 

 Bull. Mus. Univ. State Missouri, I, 1884, p. 28, pi. 3, fig. 3.— Miller, 

 North Amer. Geol. and Pal., 1889, p. 175, fig. 145.— Gurley, Journ. 

 Geol., 1896, pp. 93, 308. 



The following is Doctor Spencer's original description, the brack- 

 eted portions being taken from his description published in 1884: 



Frond cyathiform, with numerous bifurcating branches, united only at the 

 base, with no lateral processes : the axis consists of a black corneous substance, 

 which is striated longitudinally. The fallen frond has some of the branches 

 overlying each other, forming a coarse [giving somewhat the appearance of an 

 irregular] network. The radicle consists of a well-marked, thick, corneous 

 mass. 



The branches are about three-hundredths of an inch in breadth [rather over a 

 millimeter]. The specimen under consideration is most interesting. When 



« New York State :Mus., Memoir 11, 1908, p. 163. 



