DENDROID GRAPTOLITES OF HAMILTON, ONTARIO. 



39 



obtained the frond had a general flal)el]ate form with tlie radicle well marked. 

 Having branches radiating to nearly a semicircle: but on trimming the speci- 

 men the portion of the stem with radicle was chipped off and revealed the 

 remainder of a beautiful frond which was now shown to be circular — [the 

 frond having been bent partly over in the mud, and having the lower portion 

 covered before the whole was flattened in the sediment] thus proving the 

 funnel-shaped character vv'Iien 

 living. This fossil is 2i inches 

 in diameter, and from the 

 base of the root to the top of 

 the branches it measures 1 

 inch and a half. 



It occurs in the Niagara 

 limestone [beneath the chert 

 at the "Jolly Cut"] at Hamil- 

 ton, Ontario. 



Fig. 48. — C.\lyptograptus cyathiformis Spencer. 

 Copy of Spencer's figure. 



The description of 1884 

 also adds that the branches 

 are divided into two or 

 three small terminations 

 which probably mark the 

 beginning of new 

 branches, and that only 

 one specimen, 6 cm. in 

 diameter, and 4 cm. from 

 the base of the root to the top of the branches, was found. No 

 additional specimens were noted in the more recent collections, so 

 the species is undoubtedly very rare. 



CALYPTOGRAPTUS MICRONEMATODES Spencer. 



Calyiitograptus inicrojicinatodcs Spencer, 

 Canadian Xat., X, 1882, i). 165, nomen 

 nudum; Trans. Acad. Sci. St. Louis, IV, 

 1884, pp. 564, 579, 588, pi. 3, figs. 4, 4a ; 

 Bull. Mus. Univ. State Missouri, I, 

 1884, pp. 14, 29, 38, pi. 3, figs. 4, 4a. 



Calijptograpsiis microncmatodes Gurley, 

 Journ. Geol., IV, 1896, pp. 93, 308. 



The original description is as follows: 



Frond cyathiform in its growing state, with 

 numerous lateral branches originating from the 

 older stipes. The branches overlie each other, 

 and may be united in some cases, but without 

 true crossbars. The whole frond has an anas- 

 tomose appearance with irregular rhomboidal 

 interstices. The texture is corneous (though sometimes replaced by pyrites, 

 and the surface is marked with longitudinal striations, which in some i)laces 

 82651— Bull. 65—09 4 



Fig. 49. — CALYrxuGRAPTLS mi- 



CROXEMATODES SPENCER. CoPY 



OF Spencer's figure. 



