Plate 8 



Page 

 FiQS. 1-11. Glaphur us pustulaius (WaXcott) 42 



1. Thorax and pygidium of rather small specimen, X 4. 

 U.S.N.M. No. 80551a. 



2. Two cranidia of medium size specimens, X 4. U.S.N.M. 

 No. 805516. Practically all the "pustules" of the surface 

 are in fact only the bases of slender spines of three sizes. 

 The length of those on the occipital ring is shown on left 

 hand cranidium. 



3. One of the largest of the cranidia so far observed, X 4. 

 U.S.N.M. No. 80551c. The pair of large anterior spinea 

 with two sets of three smaller spines between their bases 

 are restored from another specimen. 



4. An incomplete free cheek, X4, showing the spinose genal 

 spine and imprints of the series of very long minute spines 

 that lines the under side of the outer rim. U.S.N.M. No. 

 80551d. 



5. A pair of free cheeks, X 4, separated from the cranidium 

 but still joined by a thin band that lies just within the 

 series of minute marginal spines shown in Fig. 4. This 

 inner band is separated from the outer rim of the cheek 

 by a marginal suture that seems to extend to and beneath 

 the genal spine. Apparently it is a separate plate similar 

 to those found in Mesonacidae, Agnostidae, and certain 

 other trilobites. U.S.N.M. No. 80551e. 



6-9. Four slightly differing hypostomas, X 4, all found in asso- 

 ciation with abundant remains of this species and prob- 

 ably belonging to it. U.S.N.M. No. 80551/. 



? 10. The largest pygidium found with positively identified 

 material of this species, X 3. It is relatively more trans- 

 verse than the other specimens and differs from them also 

 in details of the axis. As the same block of limestone 

 contained also the two cranidia on which Glaphurina 

 lamottensis is founded it is not improbable that it belongs 

 with that species rather than to Glaphurus pustulatus. 

 U.S.N.M. No. 80551ff. 



11. Dorsal view of a specimen that consists of the cephalon, 

 with the free cheeks in place, and five of the thoracic seg- 

 ments, X 3. Side and anterior views of same on pi. 7. 

 U.S.N.M. No. 80551/1. 



Fine grained reefy bed at base of Upper Chazy, Isle La 

 Motte, Vt. 

 12, 13. Glaphurus laiior, new species 44 



Dorsal and anterior views, X 2, of the holotype cranidium. 

 It is to be noted that this cranidium differs from G. pustu- 

 latus in being larger and relatively wider, the brim nar- 

 rower and with only two instead of three rows of pustules 

 in front of the glabella. U.S.N.M. No. 80552. 



Whiteburg limestone, 6 miles southwest of Bland, Va. 

 14-16. Glaphurina lamottensis, new genus and species 45 



Anterior, lateral and dorsal views, X 2, of the holotype of 

 this species. The genus, of which two other species are 

 figured on pi. 7, is distinguished from Glaphurus by the 

 total pinching out of the brim between i\\e front of the 

 glabella and the cephalic rim. U.S.N.M. No. 80553. 



Reefy basal limestone of the Upper Chazy, Isle La Motte, Vt. 

 98 



