LIST OF ILLUSTRATIONS. 
STREAMS AND LAKES OF WESTERN MONTANA AND NORTHWESTERN WYOMING. 
Page. 
Plate I. — Two-Ocean Pass 1 
II. — (I) Capt. Jones's Map of Two-Ocean Pass. (2) Dr. Hayden’s Map of Two-Ocean Pass. (3) Two- 
Ocean Pass, from sketch made by Prof. Evermann 21 
III Horsetkief Springs, Montana. 37 
IV. — Botteler Springs 39 
V. — Davies Springs, near Bozeman 40 
VI Shoshone Lake, north shore - 60 
VII. — Yellowstone Lake, Mount Sheridan 60 
VIII. — Hayden Valley 60 
IX. — Yellowstone River; Rapids above the Upper Falls - 60 
X.— Upper Falls of the Yellowstone River 60 
XI.— Lower or Great Falls of the Yellowstone River GO 
XII. — Grand Canyon of the Yellowstone, from the Brink 60 
XIII. — Obsidian Cliff and Beaver Lake 60 
XIV. — Virginia Cascade of Gibbon River 60 
XV. — Gibbon Falls of Gibbon River 60 
XVI. — Lower Falls of Firehole River 60 
XVII. — (1) Keppler Cascade of Firehole River. (2) Rapids on Lewis Fork of Snake River 60 
XVTII. — (1) Catostomus discobolus. (2) Gatoslomus macrochilus. (3) Catostomus ardens 60 
XIX.— (1) Rhinichthys dulcis. (2) Mylocheilus caurinus. (3) Ptychocheilus • oregonen'sie 60 
XX.— (1) Leuciscus hydrophlox. (2) Leuciscus gilli. (3) Leuciscus atrarius 60 
XXI. — (1) Coregonus williamsoni. Adult. (2) Coregonus williamsoni. Young. (3) Coregonus tvilliamsoni. 
Head of breeding male 60 
XXII. — (1) Thymdllus signifer. Adult. (2) Thymallus signifer. Young. (3) Cottus bairdi punctulatus . _ 60 
XXIII. — (1) Salmo irideus. Adult male. (2) Salmo irideus. Young. (3) Salmo fario 60 
XXIV. — (1) Salmo mykiss. Adult. (2) Salmo mykiss. Young. (3) Salmo trutta levenensis 60 
XXV. — (1) Salvelinus inalma. (2) Salvelinusfontinalis. (3) Lota lota maculosa 60 
XXVI. — Map of Western Montana 60 
XXVII. — Map of Yellowstone National Park 60 
REPORT UPON INVESTIGATIONS MADE IN TEXAS IN 1891. 
XXVIII. — Map of Eastern Texas 90 
XXIX. — Dickinson Bayou, upstream from Nicholstone ; Dickinson, Texas 90 
XXX.— Trinity River near Magnolia Point, Texas 90 
XXXI. — Fish Pond at San Pedro Springs, San Antonio, Texas 90 
XXXII.— San Marcos River at the Mill, San Marcos. Texas 90 
XXXIII. — San Marcos Spring, San Marcos, Texas 90 
XXXIV. — San Marcos Spring, San Marcos, Texas 90 
XXXV. — (1) Hybopsis cestivalis marconis. (2) Fundulus pallidus. (3) Zygonectes funduloides 90 
XXXVI. — (1) Zygonectes pulvereus. (2) Zygonectes jenkinsi 90 
AQUATIC INVERTEBRATE FAUNA OF WYOMING AND MONTANA. 
XXXVII. — Figs. 1 to 4 258 
XXXVTII.— Figs. 5 to 8 258 
XXXIX. — Figs. 9 to 12 258 
XL.— Figs. 13 to 17 258 
XLI. — Figs. 18 to 22 258 
XLII. — Figs. 23 to 28 258 
V 
