1258 DIPLODON 



Unio longus Phjijppi, Mai. Bl, XVI, 1869, p. 44. — Pfeiffer, 



Nov. Conch., Ill, 1869, p. 477, pi. cm, figs, i, 2. 

 Unio cotcolchagncnsis Fiiieippi, Mai. LU., XVI. 1869, P- 47- — 



Pfeiffi'K, Nov. Conch., Ill, 1869. p. 484, pi. civ, figs. 9, 10. 

 Unio foncki Philippi, Mai. Bl., XV^ 1869, p. 49. — Pfeiffer, 



Nov. Conch., Ill, 1869, p. 483, pi. civ, figs. 5, 6. 

 Unio fiincki P.^rfEL, Conch. Sam., Ill, 1890, p. 153. 

 Diplodon ciiprinus Simpson, Syn., 1900. p. 883. 



An abundant and variable form. In the Synopsis, I united 

 four of Philippi's species under the name casccblanccr and ajn 

 now of the opinion that all of them should be referred to this 

 species. In a general way the shell is oblong, sometimes wider 

 behind than in front : the posterior end may be nearly rounded 

 or somewhat pointed below the median line ; it is rather thin 

 and subcompressed, the epidermis is bright and nearly smooth ; 

 the teeth are almost lamellar. There are shells in the National 

 Museum collection from Brazil, which I can hardly separate 

 from this species. 



In the Synopsis I changed Sowerby's Unio fragilis to cup- 

 rinus because the former name had been used for a Unio. 

 Since the issue of the Synopsis I have become convinced that 

 his fragilis should also go in the synonymy of D. chilcnsis. 



Diplodon solidueus (Philippi). 



Shell subelliptical, the dorsal line a little more rounded than 

 the l)asal line, subinflated, rather solid, inecjuilateral, with 

 moderately full, high beaks, whose sculpture is radial ; pos- 

 terior ridge low. rounded, ending behind in a rounded point 

 below the median line; dorsal line incurved in front of the 

 beaks : epidermis lightly, concentrically striated, brownish 

 green ; pseudocardinals solid, subcompressed ; laterals curved ; 

 nacre bluish-white, tinted purple. 

 Length 54, height 33, diam. 20 mm. 

 Near Santiago ; Chile. 

 Unio solidulns Phii.ippi, Mai. Bl., XVI. 1869, p. 46. — Pfeif- 

 fer, Nov. Conch., Ill, 1869, p. 480, pi. cm, figs. 9, 10. 

 Diplodon solidulns Simpson, Syn., 1900, p. 88r. 



