BUITALO SOCIETY OF NATURAL SCIENCES 



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E 2375 A very small antero-dorsolateral, imbedded in matrix, 

 representing a species about the size of Coccosteus parvulus. 

 The width of the element is 13 mm.; its length at the 

 process, 6.5. It shows the areas for overlap by the dorso- 

 median and lateral plates. A lateral line is present; 

 it extends from the articulating process, is somewhat 

 curved, and is especially well-shown on the posterior half 

 of the element. 



We refer this specimen provisionally to Coccosteus, 

 but it may represent an immature individual of some 

 other Arthrodire. 



Fig. 4. Coccosteus sp. Anterior Half of a Mandible, Natural Size 

 Its restored outline is indicated by the broken line. E 2378. 



E 2376 A postero-ventromedian, in matrix, shown in outer view 

 (PI. 4, iig. 5). It is ornamented with very small, pointed 

 stellate tubercles, which are largest near the centre of the 

 plate and gradually decrease in size and finally disappear 

 toward the margins. Length in antero-posterior diame- 

 ter, 40 mm. ; greatest width, 30. 



E 2377 A postero-ventromedian, on a piece of matrix, shown in 

 inner view (PI. 4, fig. 4). The outer face, as appears from 

 an impression of a corner of the plate, is ornamented with 

 fine tubercles. 



b. Specimens from the Rhinestreet shale (Portage); Eighteen 

 Mile Creek, N. Y. 



E 2378 Functional portion of a small mandible lacking the ''beak" 

 (fig. 4) . The entire functional margin is preserved ; it shows 

 a row of teeth extending over its entire length, except at 

 the anterior extremity. The teeth are worn and not 

 well-preserved. The margin back of the functional area 

 drops abruptly down to meet the blade portion. Length 



