164 THE NAIADES OF MISSOURI 



large papillae; anal smooth, supra-anal large, closely connected 

 to anal; inner laminae of inner gills free, more or less, from the 

 visceral mass; palpi small, connected half of their length antero- 

 dorsad; marsupia formed by a few large ovisacs occupying pos- 

 terior part of outer gills, reniform; branchial edge with a papillose 

 caruncle; conglutinates solid, white, club-shaped, glochidia medium 

 in size, semi-elliptic. 



Sheel Characters: — -Shell very small, elliptic, rounded 

 before, rather thick, disk smooth; beaks low, coarsely sculptured 

 by regular concentric bars upcurved behind; epidermis dark 

 cloth-like. 



Miscellaneous Remarks: — This is a good genus as now 

 considered by Dr. Ortmann who treated it at first (1912, p. 337) as 

 a subgenus for Eitrynia, but even then he was inclined to consider 

 it as merely conventional whether we use it generically or sub- 

 generically. Carunculifia is remarkable for its smallest sized shells, 

 for its unique beak sculpture and for its peculiarly specialized 

 mantle edge antero-ventrad to the branchial opening. It is well 

 represented in this State by the typ^, parva, and although the 

 writer has not personally collected tecxasensis and glans yet these 

 two have been reported in such manner that they can be definitely 

 listed. 



Carunculina parva (Barnes). 



("Liliput Shell.") 



PL III, Fig. 8c; PL XXVII, Figs. 95 A—D. 



1823 — -Unio parvus Barnes, Am. Jl. Sci., VI, pi. XIII, fig. 18 (outline). 

 1900b — Lampsilis parvus Simpson, Pr. U. S. Nat. Mus., XXII, p. 564. 

 1912b — Eyrynia {Carunculina) parva Ortmann, An. Car. Mus., VIII 

 p. 338. 



ANIMAL CHARACTERS. 



Nutritive Structures: — Branchial small, directed upward, 

 with few but large papillae; anal also pointed upward, smooth, 

 supra-anal present, closely but definitely connected by mantle 

 edge; inner laminae of inner gills usually free from visceral mass 

 about one-half of their length; palpi comparatively large, connected 

 antero-dorsad about two-thirds of their length; color of soft parts 

 tan-color except for a blackish or reddish border to mantle at 

 branchial opening. 



Reproductive Structures:- — Marsupia kidney-shaped, con- 



