Sub-Order II. Halocypriformes. 



Gen. Conchoecia, J. D. Dana, 1849, p. 51. 

 Sub-Fam, Halocyprinae, J. D. Daxa, 1852, p. 1281. 

 Fam. Conchoeciadae, G. O. Saus, 1865, p. 114. 



„ ,,der Conchoeciaden oder Halocypride n", C. Claus, 1874 b, p. 7. 

 ,, Conchoeciidae, G. 0. Sars, 1887, p. 64 (236). 

 ,, Halocyfridae, C. Claus, 1888, p. 152. 



G. W. MULLKR, 1894, p. 221. 



G. S. Brady and A. M. NomiAN, 1896, p. 682. 



G. W. MOller, 1912, p. 53. 



Diagnosis: — This sub-order comprises only a single family, the family Halocyfridae. 

 For the diagnosis of the sub-order I refer the reader to the diagnosis of this family given below. 



Family Halocypridae. 



Synonyms: — See sub-order Halocypriformes. 



Diagnosis: — Shell: — There is in most cases a distinctly developed rostral incisur 

 on the anterior edge. The dorsal margin is more or less straight, the ventral margin is in most 

 cases more or less convex or straight, less often slightly concave. The posterior part of the shell 

 is not siphon-shaped, the posterior margins of the two valves are, on the contrarv, here situated 

 close to or almost close to each other when the shell is closed. The valves are joined along less 

 than half the periphery; the joined edges of the hinge never have any teeth. Within the free 

 margin there is in most cases a very small number (sometimes even none or almost none) of 

 medial bristles. There is only slight calcification (the preserved material is most frequently 

 soft because of the more or less complete solution of the lime). Moderately large or rather 

 small forms. 



