300 Miscellaneous. 



99. Achnanthidium delicatula, Kiitz. [C] 



100. Achnanthidium glabrata, Giuii. 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. Striai 12-13 in 001 mm. Valve narrow, linear ; 

 looks 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. 



[M.] 



102. Rhoicosphenia ciu'vata, Kiitz, San Pedro, rare. [M.] 



103. Epithemia gibba, Kiitz. Northern California, not very 

 rare. [M.] 



[To be continued.] 



MISCELLANEOUS. 



IVie Locality of the Tyiie of Prionastraea Vaughani, Gregory. 



To the Editors of the ' Annals and Mayazine of Natural History * 



Gextlemex, — In the 'Annals and Magazine of Natural History' for 

 December 1899, pp. -^o^, 459, figs. 2 a & 2 6, Prof. J. W, Gregory has 

 described and named an Eocene coral from Alabama as Prionastrcea 

 Vauyhani, 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. Yaughan informs me that the precise 

 locality is, no doubt, Huntsville, Ala." I pointed out to Prof. Gregory, 

 when 1 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 ^fap of Alabama, Ala. Geol, Surv. 

 1894). T am not sure whence the type of Prioaastrcm Vauyhani 

 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 Smvev. T. Watlanb VAUGHAJf. 



Jan. 21, 1901. 



