36 



StrcptorUynclius or Strophomeiia. At the same time that he 

 proposed the genus Hemipronites, Pander also described two 

 other genera, founded on unimportant differences in the 

 character of the foramen, partly natural, partly accidental 

 to the specimens. The respective lists of species were, as in 

 the preceding cases, chiefly made up of unimportant indi- 

 vidual variations. Of Orthambonites^ Bronn refers eleven 

 out of eighteen species, including the first, to OrtJiis calli- 

 gramma, Dalman, while of the genus Go^iamhonites, with 

 twenty-four species, fonrteen are referred to Ortliis inflexa, 

 Vern., and eight, including the first, to 0. plana, Vern. This 

 species is figured by Quenstedt, and is a KUtambonites (or 

 Orthisina), and it seems at least probable, from Pander's 

 figures, that more of his species belonged there, while others 

 will be referable to Strophomena, &c. Orthambonites must 

 be considered a synonym of Orthis, at least for thepresentj 

 and there does not at present appear to be anything not 

 referable to previously named genera in Gonambonites. 



The conclusions to which this review of the history of 

 these names would seem to lead, may be expressed syno- 

 nyraically as follows : 

 Genus Strophomena, Blainviile. 



■ a. Strophomena {rugosa, Bl.), 18'25, Dav. 1853. 



Hemipronites {planuvibona). Meek, 1873. 



Leptaena {eutjhjpha), Dalinau, 1828. 

 h. Ripparioiij/x (proximus), Vauuxeni, 1843. 



Orthothetes {f crenislria, Phil. Evans, MSS. 1837?), Fischer, 1850, 



Streptorhynchus {pelargonatus, Schl.), King, 1850. 

 l)b. Plcctamboniies {rhomboidaJisf), Pander, 1830, 



Strophomena (rhomboidalis, Walil.), Meek, 1873. 



Lepiacna {rhomhoidalis), Dalman, ]8"28. 



Leptacyia (rhonihoidalis, Walil.), King, 1846. 



Leptagonia (analoga, Phil.), M'Coy, 1844. 



c. Leptaena (transversalis), Dalman, 1828, Dav. 1853. 



riectamionites (iransvejsa), King, 1850. 



d. Stropheodonta (demisaa, Conr.), Hall, 1850. 



Genus Klitambonites, Pander. 



a. KUtambonites (adsccndcyts), Pander, 1830. 

 Proniles (adscendens), Pander, 1830. 

 Hemipronites (tumida), Pander, 1830, 

 Gonambonites (plana), Pander, 1830. 

 Orthisina (anomaJa), D'Orbigny, 1847. 



Genus Orthis, Dalman. 



a. Orthis (caUigramma), Dalman, 1828. 



Orthambonites {caUigramma), Pander, 1830. 

 Schi:ophoria {striatula), King, 1850. 



