LIST OF PUBLICATIONS. 



211 



Weight, Fked, E. — Ooutinued. 



Describes the physical and 

 chemical properties of these 

 obsidians with especial refer- 

 ence to the formation of their 

 included spherulites and litho- 

 physas, which are considered 

 due to the influence of gases. 

 " The genei'al hydrostatic ten- 

 sion resulting from shrinkage 

 of the central part of the cool- 

 ing magma probably aided in 

 this development, but the in- 

 closed gas pressing against the 

 walls of the cavity was also an 

 important factor." Incidental 

 attention is given to peculiar 



Whight, Fred. E. — Coutinued. 



surface markings noted on sev- 

 eral of the specimens which 

 had previously been referred to 

 by Merrill (Proc. U. S. Nat. 

 Mus., vol. 40, 1911) as closely 

 simulating the markings of the 

 moldavites and which had been 

 assumed by Suess to be in- 

 dicative of a meteoric origin. 

 It was shown that in this case 

 the etchings were of terrestrial 

 origin, and in this, as well as 

 the condition of strain exhibit- 

 ed by the glass, the opinions 

 advanced by Merrill were fully 

 corroborated. 



PALEONTOLOGY. 



Bebky, Edward W. Two new Tertiary 



species of Trapa. 



Torreya, 14, No. 6, 



.Tune, 1914, pp. 105- 



lOS, 1 flg. 



Describes and figures 2 new 



species, Trapa wilcoxensis and 



T. alahamensis. 



The affinities and distribution 



of the Lower Eocene flora of south- 

 eastern North America. 



Proc. Amer. Philos. 

 Soc, 53, No. 214, 

 June-.Tuly, 1914, pp. 

 129-250, 1 flg. 

 A very thorough discussion of 

 the ecology, affinities, and dis- 

 tribution of the Lower Eocene 

 flora of the region treated. 



Additions to the Pleistocene 



flora of the southern states. 



Torreya, 14, No. 9, 



Sept., 1914, pp.159- 



162. 



Adds about 10 species to the 



late Pleistocene flora of the 



region. 



The Mississippi River bluffs at 



Columbus and Hickman, Kentucky, 



and their fossil flora. 



Proc. U. S. Nat. Mus., 



48, No. 2074, Jan. 



28, 1915, pp. 293- 



303, pis. 12, 13. 



Discusses the stratigraphy 



and describes 17 species of 



plants from this area, showing 



thereby that the strata are of 



Pleistocene age and not early 



Eocene as heretofore supposed. 



Dall, William Healey. A mono- 

 graph of the moUuscan fauna of the 



Dall, William Healey — Continued. 



Orthaulax pugnax zone of the 01 i- 

 gocene of Tampa, Florida. 



Bull. V. S. Nat. Mus., 

 No. 90, Jan. 21, 1915, 

 pp. i-xv, 1-173, pis. 

 1-26. 

 The types of this monograph 

 are in the U. S. National Mu- 

 seum. The new genus Micro- 

 cerion is described from a fos- 

 sil land shell, and the fol- 

 lowing new species are added 

 to the catalogue of those 

 already known : Bulimttlus 

 (Hyperaulax) tampae, B. (H.) 

 hallistae, B. (H.) tortilla, B. 

 (H.) remolina, Microcerion 

 floridanttm, Pupoides pilsbryi, 

 Planoriis tampaensis, P. (Tor- 

 quis) elisus, Spiraxis tampae, 

 Acteon tampae, Acteocina squar- 

 rosa, Bullaria (Hamineal) sul- 

 cobasis, Conus illiolus, C. des- 

 ignatus, Turris alMda, Drillia 

 condominia, D. severina, D. 

 sella, D. eupora, D. ielotheca, 

 D. spica, D. tecla, D. smilia, D. 

 eupatoria, D. tama, D. glyphos- 

 toma, D. (Gymato syrinx) silfa, 

 Mangilia illiota, Cancellaria 

 (Bivetopsia) suhthomasiae, C. 

 (B.) depressa, Oliva posti, Oli- 

 vella eutorta, O. colleta, Mar- 

 ginella mollitor, M. infecta, M. 

 gregaria, M. impagina, M. 

 posti, M. intensa, M. myrina, 

 Lyria silicata, Mitra syra, M. 

 myra, Strigatella americana, 

 Fasciolaria petrosa, Alectrion 

 Ursula, A. ethelinda, A. gard- 

 nerae, Anaclus cutlieria, Asty- 

 ris ehithcra, A. dicaria, A. acan- 

 thodes, Murex sexangula, Tri- 

 tonalia scabrosa. Typhis siphnn- 

 ifera, Rapana biconica, Eulima 



