36 



Streptorhynelius or Strophomena. At the same time that he 

 proposed the genus Remipronites, Pander also described two 

 other genera, founded on unimportant diiferences 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 Ortliis calli- 

 gramma, Dalman, while of the genus Gonambonites, with 

 twenty-four species, fourteen are referred to OrtJiis injlexa, 

 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. Orthamhonites must 

 be considered a synonym of OrtJiis, at least for the present; 

 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- 

 nymically as follows : 

 Genus Strophomena, Blainviile. 



a. Strophomena {rugosa, BL), 1825, Dav. 1853. 



Hemipronites (planumbona), Meek, 1873. 



Leptaena (eitgli/pha), Dalman, 1828. 

 h. Sipparionyx (proximus), Vauuxem, 1843. 



Orihothetes {f crenintria, Phil. Evans, MSS. 18371), Fischer, 1850. 



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

 th. Plcotambonites (rhomboid alisf), Pander, 1830. 



Strophomena {rhomboidalis, WaiiL), Meek, 1873. 



Lepinena {rhomboidcdis), Dalman, 1828. 



Leptaena (rhomboidalis, Wahl.."), King, 1846. 



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



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



Fleet ambonites (transversa), King, 1850. 



d. Siropheodonta (demissa, Conr.), Hall, 1850. 



Genus Klit ambonites, Pander. 



a. KUtambonites (adscendcns), Pander, 1830. 

 Fronites (adscendens), Pander, 1830. 

 IIemipro7iiteS'(lumida), Pander, 1830. 

 Gonambonites (plana). Pander, 1830. 

 Orthisina (anomala), D'Orbigny, 1847. 



Genus Orthis, Dalman. 



a. Orthis (calligramma), Dalman, 1828. 



Orthambonites (calligramma), Pander, 1830. 

 Schizophorla (strialida), King, 1850. 



