1912J The Ottawa Naturalist. 43 



intervals of about 2 mm. with finer, somewhat sinuous lines be- 

 tween the heavier ones. 



Remarks. It must be admitted that both the anal tube 

 and the anal plate are of doubtful interpretation and consequently 

 the orientation of the form is questionable. Notwithstanding 

 this uncertainty, the existence of two, and two only, divided 

 radials, together with the lack of symmetry in the arms and their 

 peculiar insertion, justify the creation of a new genus and species. 

 The form seems to foreshadow the Platycrinidae of a later period. 



glaucocrinus, gen. NOV. 



Basals five, equal. Radials relatively large. The right 

 anterior and the left posterior radials transversely divided. A 

 small anal rests on the upper left shoulder of the right posterior 

 radial. The three normal radials bear stout bifurcating arms. 

 The other radials support arms of a different character or may 

 lack arms on at least one of the plates. 



GLAUCOCRINUS FALCONERI, SP. NOV. 



Specific characters as in the general description given above. 

 Named for President Falconer of the University of Toronto. 

 Type No. 610 T., University of Toronto Museum. 

 Formation Trenton. 

 Locality Kirk field. Ont. 

 Collector Joseph Townsend. 



The second species herein described is founded on two 

 specimens which are evidently referable to the genus Glypto- 

 crinus. Each of the specimens shows a considerable portion 

 of the cup with the stem attached: one exhibits the plates of 

 the cup in an admirable manner; the other, which is less perfect 

 in this respect, shows, however, almost the full extent of the 

 arms. The accompanying figure (plate, IV, fig. 2) has been 

 prepared bv combining the features exhibited by the two speci- 

 mens. It is regrettable that neither example reveals the ar- 

 rangement of the plates in the posterior interray. 



The cup. In one specimen, the cup is 19 mm. high and 15 

 mm. wide; in the other, it is about 14 mm. high and 11 mm. 

 wide. As far as can be observed, the basals consist of five 

 similar pentagonal plates, considerably smaller than the radials. 

 These latter plates are of equal size and of an heptagonal outline. 

 The radials are succeeded by two somewhat elongated primi- 

 brachs (costals), the first of which is hexagonal and the second 

 heptagonal. The second primibrach is axillary and is succeeded 

 bv the secundibrachs (distichals) which occur in single series. 

 The interray shows a lower plate which is hexagonal in outline: 

 this is followed by three pairs of interbrachial plates of which the 

 last pair is interdistichal in position. Above this point, the 



