54 



BULLETIN 65, UNITED STATES NATIONAL MUSEUM. 



fine fibers; showing on the margins some blunt triangular processes, about 0.5 

 mm. wide and projecting about 0.5 mm. from the stem and about 1 mm. apart. 

 Fiom the present material it would seem as though these processes form a 

 somewhat less prominent feature than in /. diffusus and in /. iculkcri, but this 

 is somewhat doubtful. 



The principal difference between this variety and /. (Uffiisn.s proper is the 

 considerably greater thickness of the branches and the lesser prominence of the 

 lateral blunt spines. The latter feature, however, may be a condition of 

 preservation, and the former distinction may possibly be obliterated by a 

 larger series of specimens. 



Hoi^ison and locality. — Niagara dolomite (blue building bed), 

 Hamilton, Ontario. 



Holotype. — Walker Museum, University of 

 Chicago, No. 1350T. 



INOCAULIS CONGREGATUS Gurley, new species. 



A single specimen in the collection of the 

 Walker Museiun is the basis of this species, 

 described by Gurley as follows: 



Polypary consisting of a number (about S in the 

 type-specimen) of approximated and parallel stems, 

 which are set 20 in 25 mm. transversely, and are 

 simple for about 25 mm. Several bifurcate at this 

 level; the central ones, howevei", bifurcate about 10 

 mm. higher up. Thickness of main stem about 1-1.2 

 mm.; of branches nearly the same (about 1 mm.). 

 Thecse obscure, the margins of the branches obscurely subserrate. 



Fig. 70. — Inocaulis CON 

 gregatus, new spe 

 ciES. Holotype. 



Horizon and locality. — Niagaran formation, Hamilton, Ontario. 

 Holotype. — Walker Museum, l^niversity of Chicago, No. 13508. 



INOCAULIS ? STRICTUS Gurley, new species. 



Plate 2, figure G. 

 The description by Gurley is as folloAvs: 



?l 



FWanches rigid, not spreading, but up- 

 right and rather straight, bifurcating 

 at a comparatively small angle (about 

 45°), diminishing in width from 2 mm. 

 at the proximal end of the fragment to 

 1.5 (rarely to 1) mm. at the distal. 

 INIargins generally smooth, in one or two 

 places subserrate. Successive bifurca- 

 tions rather frequent (distant 5 to 10 

 mm.). 



Horizon and locality. — Niagara 

 chert, Hamilton, Ontario; one 

 specimen (the type) in the Spencer collection, one specimen in Grant 

 collection. 



Fin. 71. — IxocAiLis? sTi!icTr.s, new spe- 

 cies. Holotype. (See also Pl. 2, 

 FIG. G.) 



