300 Miscellaneous. 
99. Achnanthidium delicatula, Kiitz. ([C.] 
100. Achnanthidium glabrata, Grun. San Pedro, not rare. 
[C., M.] | 
According to Grunow (Arct. Diat. p. 22) very common in 
the Pacific, especially on the coast of North and South 
America. Striz 12-13 in 0:01 mm. Valve narrow, linear ; 
‘soks like a small A. brevipes, var. angustata, of which it 
might be a variety. Length 0°046 mm. 
101. Achnanthes longipes, C. Ag. San Pedro, rather rare. 
iM.] 
102. Rhoicosphenia curvata, Kiitz. San Pedro, rare. [M.] 
103. Epithemia gibba, Kiitz. Northern California, not very 
rare, \ENial 
! | 
[To be continued. Jer "+ Pr, tof y, Lf 
MISCELLANEOUS. 
The Locality of the Type of Prionastrea Vaughani, Gregory. 
To the Editors of the ‘ Annals and Magazne of Natural History.’ 
GrntLemeN,—lIn the ‘Annals and Magazine of Natural History’ for 
December 1899, pp. 458, 459, figs. 2a & 26, Prof. J. W. Gregory has 
described and named an Eocene coral from Alabama as Prionastrea 
Vaughani, doing me the honour to use my name in the specific desig- 
nation. Prof. Gregory makes the following remark under the side- 
heading “Affinities” :—‘“ Mr. Vaughan informs me that the precise 
locality is, no doubt, Huntsville, Ala.” I pointed out to Prof.Gregory, 
when I was in the British Museum (Natural History), that this coral 
was undescribed and unnamed, and requested him to please name 
and describe it, but he is mistaken in saying that I told him it came 
from Huntsville, Alabama. Huntsville, Alabama, is in the extreme 
northern portion of the State, in Madison County, and is only 
18 miles south of the Tennessee line. Geologically, it is situated on 
rocks near the base of the Subcarboniferous, the Tuscumbia limestone 
see Eugene A. Smith’s Geological Map of Alabama; Ala. Geol. Surv. 
1894). Iam not sure whence the type of Prionastrea Vaughani 
comes, but I am under the impression that it is from Gregg’s 
Landing, on the Alabama River, in Monroe County. Mr. T. H. 
Aldrich, of Birmingham, Ala., sent the specimen to the British 
Museum (Natural History), but, unfortunately, seems to have no 
other. 
Very respectfully yours, 
U.S. Geological Survey. T, Waybanp VAUGHAN. 
Jan. 21, 1901. 
