THE NAUTILUS. 



19 



noted measures 44 mm. in total length ; 38"5 mm. in the length of 

 the haemal valve; 40 mm. in maximum width and 21"5 mm. in 

 maximum diameter. It is waxen white with extraneous brown 

 stains and has no anterior flexure. Davidson's figure of Tr. Crosaei 

 (Trans. Liu. Soe. IV, pi. 3, fig. 6) resembles it, but is more faintly 

 sculptured and less transverse. — W. H. D. and H. A. P. 



Explanation of Plate I. 



Figs. 1, 2, 3. Terehratula Stearnsii Dall & Pilsbry. 

 " 4, 5. Terebratidina var. Kiiensis Dall & Pilsbry. 

 " 6, 7. * unguicula Cpr., typical, a large specimen. 



ON THE YOUNG OF BACITLITES COMPRESSTJS SAY. 



BY AMOS P. BROWN, PHILADELPHIA. 



The young of Baculites compressus Say has been recently dis- 

 covered by me in some cretaceous marl from the vicinity of Dead- 

 wood, South Dakota. Associated with them in the same material 

 were several species of Baculites, Scaphites and Inoceramiis. The 



eiii-y 



•■'^V 



Ai 



young Baculites were of the form shown in figures 1 and 2 and varied 

 in length from 1 to 3 cm., with a diameter of ()'4 to 2 mm. Other 

 larger fragments with the spiral end broken oiF were found from 



