142 ANNALS NEW YORK ACADEMY OF SCIENCES 



more rigid characters of the mucronate apertural margin of the thecae in 

 Staurograptus may be noticeable. 



Unfortunately, I was not successful in finding any remains which can 

 be compared with "Bryograptus spinosus Matth." ((10), p. 269, pi. 48, 

 fig. 3) and "Clonograptus spinosus Matth." ((11), p. 97, pi. 7, fig. 2), 

 which is said to present only 8 thecae in 10 mm. of length of the branch 

 and a distinct "axis or virgula." Nevertheless, here, too, the identity 

 with Staurograptus dichotomus seems to me not quite impossible. Nor 

 -could I observe any specimens belonging to "Bryograptus ? retroflexus" 

 (Matthew (10), p. 271) or to Callograptus (1. c, pi. 48, fig. 5), which 

 therefore must be at least extremely rare. 



On the contranr, with an abundance of individuals there is found 



Monobolina refulgens Matthew 



(11) 1891. G. F. Matthew, p. 44, pi. 12, fig. 6. 



(12) 1903. G. F. Matthew, Report on the Cambrian Rocks of Cape Breton. 



Geol. Surv. of Canada, Ottawa, p. 210, pi. 11, fig. 4, pi. 16, fig. 2. 



Since generally separated valves and even broken pieces occur, nothing 

 can be added to the careful description of the author, besides the obser- 

 vation that this species is seen on the same surface associated with all 

 varieties of Dictyonema flabelliforme and with Staurograptus dichoto- 

 mus. 



Lingulella nicholsoni (?) 



Almost the same is true of a linguloid shell, cited by Matthew in 

 1895 (p. 273) as Lingulella nicholsoni (?) and in 1903 ((12), p. 204) 

 doubtfully called Lingulella "lepis Salter." The specimens of the Co- 

 lumbia collection usually have a length of 4 to 5.5 mm., a width of 3 to 

 4.8 mm. and exhibit a distinct ridge on the interior of the pedicle valve. 

 They differ from the English type as described by Salter ((9), second 

 ed., p. 538, fig. 11) in a relatively greater feebleness and scarcity of the 

 lines of growth. It may be of interest to note that a very similar 

 ""Lingulella" of Scandinavia is referred by Brogger ((5), p. 44, pi. 10, 

 %. 5, from the Tremadoc shales) and by Moberg ((2), from the Bryo- 

 graptus zone) to L. lepis Salter. 



In addition to this detailed discussion of the Dictyonema fauna, a 

 callograptoid graptolite of the upper Beekmantownian may be described, 

 because of its interesting phyletic relationships. 



Callograptus grabaui sp. nov. 



Flabelliform or shrub-like, not more than 15 mm. in length and 10 mm. in 

 width of the dendromes observed. Short, non-celluliferous, basal stem (1 mm. 



