NAIADES OF MISSOURI hi 



Genus XXIX. Lampsilis (Raf.) 



72. L. anodontoides (Lea) — (i. a) 



73. L. fallaciosa (Smith) — (i. a) 



74. L. Higginsii (Lea) — (i. b) 



75. L. Powellii (Lea) — (3. c) 



76. L. luteola (Lamarck) — (3. c) 



(19). L. luteola rosacea (DeKay) — (3. c) 



77. L. Reeviana (Lea) — (3. c) 



78. L. venlricosa (Barnes) — (3. c) / 

 (20). L. ventricosa satura (Lea) — (3. c) 



Genus XXX. Truncilla (Raf.) 



79. T. Curlisi Frierson and Utterback — (3. c) 



80. T. Lefevrei Utterback — (3. c) 



ENUMERATION OF MISSOURI NAIADES. 



FAMILIES 2 



Sub-Families 3 



Genera 30 



Sub-Genera 3 



Species 80 



Sub-SPEciEs 20 



Total of Species and Sub-Species 100 



Explanation of Figures. — For the purpose of illustrating the 

 characteristic structures of the animal a few text-figures have 

 been inserted immediately under the different Sub-Families. 

 All figures illustrating these characters are about life-size and, 

 while they are drawn from actual specimens in gravid 

 condition, yet the sketches are more or less diagrammatic in or-'er 

 to emphasize the essential features. The sketches of the glochidia 

 (most of them figured here for the first time) are actual camera- 

 lucida drawings by using lenses to magnify 87 diameters. In 

 both sets of these inserted figures, as well as in some of the plates 

 at the close of the text, the following meanings are given to the 

 letters for the labels: — 



A = anal opening; I = inner gill; 



AN = anterior end; M=marsupium; 



AV = antero-ventral margin; P = palp; 



B = branchial opening; P0 = posterior end; 



D = dorsal, or hinge line; S= supra-anal opening; 



F = foot; V = ventral margin. 



Explanation of Terms, Abbreviations, etc., used in the 

 TEXT, BIBLIOGRAPHY AND CHECK LIST. — A few technical terms intro- 



