NO. 1205. SYNOPSIS OF THE NAIADES SIMPSON. 933 



* Anodonta aperta RAFINESQUE, Atl. Jl.,No. 4, 1832, p. 134. 

 Parana River, South America. 



* Anodonta atrovireus PHILIPPI, Zeits. fur Mai., V, 1848, p. 130. 

 *Anodonta carinata DUNKER, Mai. Bl.. V, 1858, p. 225. 



Colombia. 



* Anodonta cornea PHILIPPI, Zeits. fur Mai., V, 1848, p. 130. 



Nicaragua. 



*" Anodonta giuUaini H. and A. ADAMS, Gen. Kec. Moll., II, 1857, p. 502. Credited to 



Recluz. 

 * Anodonta paph os RAFINESQUE, Atl. Jl. and Friend., 1832, p. 134. 



Parana River. 



* Anodon pictus SWAINSON, Ex. Conch., 2d ed., 1841, p. 39. 



* Anodonta u-allisi MOUSSON, Mai. Bl., XVI, 1869, p. 188. 



* Anodonta iehuanlepecensis FISCHER and CROSSE, Miss. Sci., 1894, p. 526. 



Tehuantepec. Not yet figured. 



'Anodonta hertiviyi VON IHERING. 



Where? 



* Anodonta bergl vox IHERING. 

 Where? 



Genus MYCETOPODA d'Orbigny, 1835. l 

 (Type, Mycetopoda soleniformis d'Orbigny.) 



Mycetopoda D'ORBIGNY, Guer. Mag., No. 62, 1835, p. 41. 

 Mycetopits D'ORBIGNY, Yoy. Am. Mer., 1847, p. 600. 



Shell thin, elongated, truncate above behind, with a low, posterior 

 ridge and rather flat, smooth or slightly concentrically wrinkled beaks; 

 epidermis smooth, shining, pale greenish-yellow or brownish, rayless; 

 hinge line long, straight, edentulous or showing faint traces of denticles, 

 under a glass, beneath the nacre; nacre soft, bluish- white and irides- 

 cent; muscular impressions faint, irregular, the smaller anterior scar 

 above the larger one; beak cavities shallow. 



Animal having very long gills, the inner much the larger, united to 

 the abdominal sac throughout their whole length; palpi large, round 

 below, projecting very slightly behind and attached along the whole 

 length of the straight upper border; mantle very thin, slightly thick- 

 ened at the edges; branchial opening closed below into a short papillose 

 siphon, and separated from the nearly smooth anal opening by a strong 

 bridge; superanal opening not closed below; foot very long, developed 

 at the lower end into a sort of head or button. 



. ' So named by its author in the Guerin Magazine, but afterwards changed by him 

 to Mycetopus in the Voyage Amerique Meridionale. The genus has been made the 

 type of a separate family by Gill, and was so acknowledged by Pelseneer and others, 

 but it does not seem to me to be separable from the Muielidce. Certain shells under 

 favorable light show slight deutilations along the hinge line, which are, no doubt, 

 vestigial taxodont teeth common to the family ; the labial palpi and anal bridge are 

 decidedly mutelid in character, and the great development of the foot is paralleled 

 in Solenaia, Lastena, and to some extent by Gonidea among the Unionidce. 



