379 BuixETiN 5 109 



Horizontal strata of sandstone, and compact limestone, are 

 disclosed in the cliffs on both sides the valley of the Mis- 

 souri. These rocks contain numerous remains of Caryophilla, 

 Productus, and Terebratulse.''^ 



\^Foot note, page 106'] . 

 '■'' From Fort Osage. 



Productus spinosus. Say. Longitudinally and transversely subequally 

 striated, the transverse striae somewhat larger than the others ; a few re- 

 mote short spines, or acute tubercles, on the surface, arising from the lon- 

 gitudinal strife. 



Breadth an inch and a half ; the striae are somewhat indistinct — as in 

 No. 5. 



Productus incurvus. Say. Shell much compressed ; hinge margin nearly 

 rectilinear : surface of the valves longitudinally striated ; convex valve 

 longitudinally indented in the middle ; the beak prominent and incurved 

 at tip ; opposite valve with a longitudinal prominence in the middle ; the 

 beak incurved into the hinge beneath the other beak and distant from it. 



Width more than 2 2-5 inches — A few univalves also occurred, but 

 they were so extremely imperfect that their genera could not be made 

 out. 



\^Foot note, page /o/]. 



A dark coloured carbonate of lime, containing small Terebratulae like 

 the T. ovata of Sowerby, but less than half as long. 



No. I. — A mass of carbonate of lime, containing segments of encrinites 

 in small ossicula. 



6. — A Caryophylla of a single star, about 4 inches long, of an irregu- 

 larly transversely undvilated surface, imperfect at each end, but seems to 

 have been attached at base — Near the base it is bent at an angle of abotit 

 45 degrees. 



Some small and young specimens of the Terebratula, like T. subundata 

 of Sowerby. 



Miliolites centralis — Say. 



12. Astrea. A species of very minute alveoles. From the state of the 

 petrifaction no radii are perceptible, so that the genus is not determinable. 



Saltworks near Arrow Rock. Columnar segments of the Encrinus. 



Inferior portion of the head of a Pentramea. Say. 



Segments of the column of an oval encrinus, much narrower in the mid- 

 dle than the oval vertebra of an encrinite represented by Parkinson, Vol. 

 2, pi. 13, f. 40 — resembling those of the genus Platycrinites of Miller. 



[Long's Expedition to the Rocky Mountains, Vol. L 1S23]. 



