DESCRIPTIVE 

 CATALOGUE OF THE NAIADES 



PART III. 



DiviflioD of Mdltob 



SecticHial Library 



Genus HARMANDIA Rochebrune, 1882. 



Harmandia Rochejbrune^ Bull. Soc. Phil., VI, 1882, p. 45. 



Shell subtrapezoidal, subalate, rather thin, posteriorly com- 

 pressed, with low beaks and irregularly radial sculpture, a few 

 of the ribs converging at the center of the disk, the rest be- 

 coming divaricate and covering the shell, those of the poste- 

 rior slope springing from the rib on the low, posterior ridge; 

 epidermis gray-green ; left valve with two arcuate, compressed, 

 elongate pseudocardinals in front and a triangular cardinal 

 under the beak, the right with two pseudocardinals in front and 

 a pit under the beak ; there are two nearly straight, lamellar 

 laterals in each valve, and a small, up-curved lamella above 

 them near their posterior end; anterior muscle scars deep; 

 nacre white, brilliant, showing the outside sculpture. 



Animal unknown. 



Type, Harmandia somboriensis Rochebrune. 



Harmandia somboriensis Rochebrune. 



Shell subrhomboid or imperfectly triangular, considerably 

 narrower in front, subcompressed, rather thin, inequilateral ; 

 beaks moderately elevated, somewhat pointed, their sculpture 

 apparently subradial ; anterior end narrowly rounded, almost 

 pointed; base line lightly curved, somewhat fuller behind the 

 middle; dorsal outline almost angled at the beaks, nearly 

 straight in front of and behind them ; posterior slope obliquely 



