*26. The Arthropods of the San Marcos Caves and Springs, 10 m., 
Pa i re Bre oe bd eee Ris ee cis ky Slacks ooh eraiepaitel dof otorite Carl Ulrich 
‘27. The Retinal Pattern of Single and Double Cones in the Eyes 
Mir AMevSss alOande meme coop Oe oo ceo C. H. Kigenmann and G. Shafer 
*28. Some Notes on the Blind Fish Caves at Mitchell, Indiana, 
ESTIMA eich cieccicrche rs iaroue es ese ata e Clo evave smoneya ts C. H. Higenmann 
39. The Eyes of Cambrus pellucidus from Mammoth Cave, 
1) di) 3S edeid ard GD URS CO aS MeO nO CRD Oia MEOID Ditee clot: OBsor B. M. Price 
*4(). The Optic Lobes of the Blind Fish, Amblyopsis, 10 m. .E. E. Ramsey 
*41. The Cold-Blooded Vertebrates of Winona Lake and its Vi- 
IMMA AOE TIN ay np arses de arece cates sy sy alee eve te aren oes eters) ay sifokon “consent scetons EK. HE. Ramsey 
42. Cortex Cells of the Mouse’s Brain, 10 m............... D. W. Dennis 
+43, Cocoon Spinning in Lycosa, 5 m.................. W. J. Moenkbaus 
silat. orders 1S hyora(o huis) ese abbots go simgn 6 tomo naod an oDoOS W. J. Moenkhaus 
GHOLOGY. 
45. The Physical Geography of the Region of the Great Bend of 
HAV alo aise ON mals sys sera wretch eves! cnets svete e's teres os Ww. A. McBeth 
AeA MM CErestim oy IO wal enya s ID). cay aso) isresercsek-l c= wie -)a nel slat a Ww. A. McBeth 
47. ‘The Headwaters of Salt Creek in Porter County, Indiana, 
aA ister operas isa eee earch arch oy nichoheasereyc a ayers ct oieie/ecte ele verlevelectie L. F. Bennett 
48. Weathering and Erosion of North and of South Slopes, 8 m., 
RA NT MATT Rev ets rssh eke eal nee: whale ayeteleievet ss lef oka G. Culbertson 
49. A Cranium of Castoroides found at Greenfield, Indiana, 5 m., 
SPorar et uaiedena ae ateneeleie che) whe Soko sldcaveehy calor erate ern anys hare OSE D Mew I OORe 
50. On the Waldron Fauna at Tarr Hole, Indiana, 10 m..H. R. Cumings 
51. The Stream Gradients of the Lower Mohawk Valley, 10 m., 
SPRUNG Sete p a chet edokene res facet n) va rei ave, duahates aw iee e veils Gas Oren cka tone H. R. Cumings 
2. Skull of Fossil Bison, 10 m...... W. G. Middleton and Joseph Moore 
*Author absent, paper not presented. 
