194 



PALEONTOLOGY OF NEW-YOUK. 



of the plates near the base of the proboscis, though it is evident they are variable ; but they 

 soon become hexagonal, as described and represented in the figures. There will be little 

 difficulty in recognizing any detached fragments of this species, when the figures have once 

 been studied : even the joints of the arms and fingers possess a peculiar character, and the 

 undulating or subangular surface of the plates above the second series is alone sufficient for 

 recognition. 



PLATE XLIII. 



Fig. 1 a. An individual, natural size, partially imbedded in shale. The base of the proboscis is 

 shown between the arms. The portion of an arm or fingers, seen in the centre of the 

 figure, has no connexion with the plates directly below it, which belong to the 

 proboscis. 



Fig. 1 h. Figure showing the structure of the cup, the commencement of the proboscis, and the 

 arms. 



Figs. 1 c, d, e. Detached plates from the upper part of the cup of other individuals. 



Fig. 1 f. A portion of a branch near the lower part. 



Fig. 1 ^. A similar fragment near the extremity of the branches of the fingers. 



Fig. 1 i. A fragment of an arm somewhat unequally bifurcating, but having surface aspect and 

 structure like this species. 



Fig. 1 h. The end of the joint enlarged, showing the articulating rays extending only a short 

 distance from the centre. 



Fig. 1 k. Several joints of the preceding enlarged. 



PLATE XLIL 



Fig. 7 a. A specimen of this species, with the arms broken off, but preserving a large portion 



of the long proboscis which is flattened. 

 Fig. 7 b. A portion of the proboscis enlarged, showing the form and arrangement of the plates of 



which it is composed. 



Position and locality. In the shale at Lockport. 



