﻿CRISTARTA 235 



situated under the beaks. P.eak cavities shallow. Nacre red- 

 dish, bluish towards the edtje. 



Length qg, height 5(), diam. 39 mm." (Haas.) 

 Cnstaria inangitlota Haas, Ann. Mag. Nat. Hist., (8), 1910, 



VI, p. 499- 

 Cristaria NicoiJARiCA (Morch). 



"Shell irregularly oval, slightly convex ; lines of growth 

 irregular; the marginal half of the shell olivaceous, with very 

 many obscure, radiating, obsolete, faint green rays. Within 

 silvery, iridescent posteriorly. Umbones anterior, flat, eroded ; 

 dorsal margin slightly curved ; anterior margin rounded, nar- 

 rower ; ventral margin quite curved in front and behind, 

 slightlv incurved in the middle ; posterior margin somewhat 

 narrow, bent. Cardinal teeth almost wholly wanting ; lateral 

 tooth linear, nearly obsolete." (Morch.) 



Type locality, Nicobar Islands. 

 Mytiliis nicobaricus Fabricius, Catalogue, 1825, p. 65. 

 Alasmudonta (subg. ') ukohnnca Morch, Jl. de Conch., XX. 



1872. p. 327. 

 Psendodon nicobaricus Simpson, Syn., 1900, p. 838. 



"Anodonta zoUingeri Mousson (Java, p. 96, t. xviii, f. i) 

 is similar, but the species of Fabricius differs: in the curved 

 ventral margin, suddenly ascending posteriorly, as well as 

 in the margin of the dorsal slope, which is not at all curveil." 

 (Morch.) 



Fabricius gave no description of his Mytiliis nicobaricus, 

 so that the species must be credited to Morch. 



In the Synopsis I placed this species in Pseudodon in reliance 

 upon Morch's comparison with P. aollingeri Mss. I have 

 recently been favored with the following note on the species 

 from Dr. F. Haas: "I have been able to obtain the type of 

 this species from Copenhagen and to determine that it is to be 

 referred to the genus Cristaria. There is only a single speci- 

 men known and that has been ground off on the edges, so that 

 the shape has been changed. Nevertheless I consider Cr. nico- 

 harica a good species, related to my C. inangnlata." 



