Il6 THE NAIADES OF MISSOURI 



the same host as that for Fusconaia ebena. Its breeding season 

 is the same as that of A. grandis. 



Anodonta Danielsii Lea. 



("Daniel's Shell.") 



PL XXIV, Figs. 76 A and B. 



1858 — Anodonta danielsii Lea, Proc. Ac. N. Sci. Phila., Ill, p. 113; 



Jl. Ac. N. Sci. Phila., i860, IV, p. 365, PI. LXIII, fig. 190. 

 1859 — Anodonta texasensis Lea, Proc. Ac. N. Sci. Phila; p. 113; Jl. 



Ac. N. Sci. Phila. i860, p. 366, PI. LXIII, fig. 191. 



Animal Characters: — Branchial opening wide, densely 

 papillose, anal smooth, supra-anal small, far removed from anal by 

 mantle connection; palpi large, united two- third of their length 

 antero-dorsad; inner laminae of inner gills free from visceral sac. 



Reproductive Characters: — Marsupia occupying outer 

 gills, when charged pad-like, ventral edge blunt, greenish poster- 

 iorly, rest rusty brown; glochidia not found so far. 



shell characters. 



External Structures: — vShell subelliptical, moderately 

 large, subsolid; disk smooth; beaks rather low, sculptured with 

 coarse double loops radiating from the beaks; epidermis dark 

 horn with areas of green between the dark lines of growth. 



Internal Structures: — No teeth; scars faint; umbonal 

 cavity shallow; nacre pearly-blue to light salmon with bluish 

 border. 



Sex Length Width Diameter Um.ra. Locality 



9 115 X 55 X 40mm — 0.304 — (Lost Creek, Amity, Mo.) 

 cf 180 X 65 X 42 " — 0.290 — (Tarkio R., Craig, Mo.) 

 9 82 X 42 X 30 " — 0.268 — (Flat Cr., Sedalia, Mo.) 

 9 ,so X 30 X 17 " — 0.280 — ( " " " " ) 



The last measurement is that of the smallest and youngest 

 Danielsii that has been obtained. It is a beautiful grass-green 

 shell with a single brown band running parallel with the growth 

 lines. Its beak sculpture is the most distinct of any in the writer's 

 collection and is typically Anodontine. Its soft parts are tannish 

 and the outer gills are plainly marsupial. 



Miscellaneous Remarks: — This species is a rather common 

 creek Jorm of grandis. It is especially characterized by a more 

 elongated, compressed and smaller shell. As a rule its shell is 

 also thicker and its epidermis takes on more of a greenish color 



