﻿368 ANODONTA 



Aiiodon coniplaiuitKs vSowkki-.v, Conch. Icon., X\'II, 1877, pi. 



IX, fig. 21. 



Accordinq- to Ilanley (Shells of Linnaeus, p. 144), the Ano- 

 donta coinplanata in Rossmassler, Icon., Pt. 4, Plate xx, fig. 

 2S^, is contained in the box in the Linnsan collection marked 

 anatina. This is a rather small, compressed form, slif^htly an- 

 g"ular in front and behind. 



Ortmann, (1. c), considers this a valid species and states 

 that in his opinion, with this exception, all the Anodontas of 

 central Europe should be referred to cygnea. 



\'ar. piscinalis Nilsson. 



Shell smaller and shorter than the type, solider, with a high- 

 er, distinctly angled dorsal wing, the post-dorsal outline usually 

 decidedly incurved ; umbonal region generally fuller. Surface 

 rather smooth and shining, the umbonal region reddish-brown, 

 the remainder of the shell having wide, faint bands of dark 

 brown and yellow-green alternating, usually somewhat rayed. 

 Length no, height 57, diam. ^t, nmi. 

 Length 106, height 60, diam. 33 nmi. 

 Anodonta piscinalu Nir.ssoN, Hist. Moll. Svec, 1822, p. 116. 

 — RossMA.ssiJvR, Icon., IV, 1836, p. 23, pi. XIX, fig. 281, etc. 

 — Gassiks, Moll. Agen.. 1849, P- ^9^> P^- iv, fig. i. — Dupuy, 

 Hist. Moll. B'r., 1852, p. 612, pi. xxi, figs. 17, 18. — Drouet, 

 Nay. France, No. 5, 1852, p. 11, pi. v, fig. i. — Kustrr, 

 Conch. Cab. Ano., 1853. p. 45. pi. iir, figs. 4, 5. — Moquin- 

 Tandon, Moll. Fr., H, 1855, P- S^i. pi- xlv, figs. 5, 6: xlvi, 



figs. T, Ifl. 



Quite distinct from the A. cellensis of Rossmassler. being 

 smaller and shorter than that, and often considerably heavier, 

 with an angular dorsal wing, and rather smooth surface. But 

 the above description only applies to typical forms of piscinalis 

 and there is every conceivable variation in every direction. 



\'ar. ponderosa C. PfeifFer. 



Shell subrhomboid, rather inflated, solid with a full rounded 

 or slightly biangulate posterior ridge; beaks but slightly ele- 



