94 THE NAUTILUS. 



In his work on the Middle Devonic of Wisconsin, Dr. H. F. 

 Cleland* figures three species of Brachiopoda, on which the 

 original color design is preserved, viz., Lingula milwaukeensis 

 Cleland, PL 12, Figs. 3 and 4; Lingula sp. indet, PI. 12, Fig. 5; 

 and Craenaena iowensis Calvin, PI. 13, Figs. 8 and 9. To this 

 interesting list of occurrences we are able to add three more in 

 which the preserved markings assume a definite pattern and 

 another in which the entire shell is colored and of which we are 

 somewhat dubious. 



Greger Coll., No. 35-17. Lingula sp., Rowleyf from the 

 Grassy Creek Shale (Upper Devonic) of Pike County, Missouri, 

 frequently shows dark blue bands, concentrically arranged, and 

 these we at first attributed to variation in the thickness of the 

 test, but after carefully removing the shell from the matrix, their 

 true character was discovered. The ornamental design of this 

 species is identical with that of Lingula milwaukeensis Cleland. 

 That these bands of color are a vestige of the original ornamen- 

 tation of the species can scarcely be questioned. 



Greger Coll., No. 282-5. Dielasma Calvini, H. & W., from 

 the upper beds of the Craghead Creek Shale, in two examples, 

 show rays of color, the design being quite similar to the mark- 

 ings shown on Oranaena iowaensis Calvin, in Dr. Cleland' s fig- 

 ures. In our shells the lines are very faint and at best afford 

 little more than a suggestion of the color design. 



Greger Coll., No. 70-10. A specimen of Orbiculoidea humilis 

 Hall, from the Hamilton shales of the Canandaigua Lake region 

 of New York, retains the color pattern, which consists of alter- 

 nating concentric bands of light greenish horn and dark chestnut 

 brown. 



Greger Coll., No. 79-12. Crania modesta, W. & St. J., from 

 the Cherokee Shale (Pennsylvanian) of Central Missouri, at- 

 tached to a section of a large Crinoid Column, are dark blue or 

 slate-colored, their host being pearl-gray or nearly white. 



*1911, Cleland, H. F., Wis. Geol. and Nat. Hist. Surv. Bull., No. 21, 

 PI. 12, figs. 3, 4, 5 ; PI. 13, figs. 8, 9. 



1 1908, Rowley, R. R., Mo. Geol. Surv. , Vol. 8, 2nd Series, p. 74, PI. 17, 



fig. 14. 



