CAEBONIPEROUS SrECIES. 59 



about 0.20 inch ; number of costaj at the outer wall of one of the larger 

 corallites, about six in 0.10 inch. 



On first examining this coral, I was rather inclined to think it might be 

 the same as a form described by me in the fii-st volume of the California 

 Report (plate 1, fig. 4) doubtfully as a variety of i. mammillarc. On compari- 

 son, however, its corallites are found not only to be more irregular in size 

 and more divergent, but to present important internal differences. In the 

 first place, they have a more solid and well-defined columella, with the 

 tabulee of the inner area differently arranged. The most important differ- 

 ence, however, is to be observed in the comparative breadth of the outer 

 vesicular zone, which is very much narrower in the species under considera- 

 tion, and only occupied by one or two ranges of vesicles, instead of three 

 or four ; and these vesicles, as seen in longitudinal sections, are directed 

 more obliquely upward (fig. 1 c, pi. G). 



Among the described European species, it seems to be most nearly rep- 

 resented by L. Martini, Edwards and Haime (see Brit. Mountain Limestone 

 Corals, xl, figs. 2 a-[/), and L. PJiillipsi, E. & H. (ib., xxxix, figs. 3, 3 a). 

 From the first of these, however, it differs not only in having the corallites 

 less uniform in size, and often more divergent, but in having the tabulaj of 

 its inner area, as seen in vertical sections, frequently divided instead of sim- 

 ple, and its outer vesicular zone proportionally narrower, while its secondary 

 septa, as seen in transverse sections, and particularly in the calices, are pro- 

 portionally shorter. It also diff"ers from i. Phillipsi in the inequality and 

 more irregular arrangement and greater divergence of its coraUites, which 

 are likewise less flexuous, and want the peculiar coalescent character so 

 characteristic of that species. The L. Phillipsi probably also shows corre- 

 sponding hiternal differences ; but, as I have seen no figures or descriptions 

 of its internal characters, I have no means of making farther comparisons. 



The specific name of this coral is given in honor of Prof J. D. Whitney, 

 State geologist of California. 



Locality and position.— From the dark bluish-gray Carboniferous lime- 

 stone at Boxelder Peak, Wasatch Range, Utah. 



