Clark. — New Blastoids and Brachiopods 



PLATE 1. 



(All the specimens figured are in the Museum of Comparative Zoology). 



Pentremites saxiomontanus Clark. 



Fig. 1-3 are three views of the type, M. C. Z. 1001, from Squaw Creek, Mon- 

 tana. X f. 



Fig. 4-6 are similar views of a less well-preserved specimen from the Quad- 

 rant limestone at Old Baldy, Montana. X ^. 



Pentremites diver gens Clark. 



Fig. 7-10 are three views of the type M. C Z. 1002. Fig. "^ shows very clearly 



that the specimen is thickest at the base of the ambulacra. One side is 



unfortunately damaged. 

 Fig. 10 is a single view of a smaller specimen, also incomplete, and shows the 



sutures between a deltoid and two adjacent ambulacral plates. X 7. 



From the Quadrant limestone at Old Baldy, Montana. 



Pentremites altimarginatus Clark. 



Fig. 11-13. Three views of the type, M. C. Z. 1003, which is very well pre- 

 served though fragile. X ^- From the Quadrant limestone at Old 

 Baldy, Montana. 

 Fig. 14. A fragment of Quadrant limestone from Old Baldy, Montana. It 

 contains 



Center, Pentremites saxiomontanus Clark. 

 Right, Pentremites altimarginatus Clark. 

 Left-center, Hustedia mormoni Marcou. 

 Top, Spiriferina kentuckiensis Shumard. X |-. 



Schizoblastus haynesi Clark. 



Fig. 15-17. Three views (including basal) of a small rather poorly preserved. 



specimen. X 4. 

 Fig. 18-20. Three similar views of the type M. C. Z. 1004. X 4. 



Both from the Madison limestone, Squaw Creek, Montana. 



