348 APPENDIX. 



LiTuiTES, Breyn [p. 56]. 

 Add to synonymy Ancistroceras, Boll (part), 185t. 



Nautilus, Breyn [p. 60]. 



SOLENOCHILUS, Meek and Worthen, 1870. Proposed instead of 

 Cryptoceras, d'Orb, 1850, not of Barrande, 1846 (changed to 

 Ascoceras), nor Cryptoceras, Latreille (Hymenoptera), 1804. A 

 carboniferous species, Nautilus (Solenochilus) coUectus, M. and 

 W., is described from Indiana. 



PLEURO NAUTILUS, Mojsisovics, 1882. Triassic ; Europe. 



Ammonites, Brug. [p. 60]. 



Mojsisovics has characterized the following new Ammonite 

 genera in " Cephalopoden der Mediterranean Triasprovins," 

 1882:— 



DiNARiTES, KLiPSTEiNiA ( Geratitee). 



celtites (Tropitse). 



PROCLADisciTES (Arcestae). 



BENECKEIA, LONGOBARDITES, LECANITES, NANNITES, GYMNITES, 



STURIA {Pinacocerse). 



PETALICHNUS, TERATICHNUS, TRACHOMATICHNUS, S. A. Miller, 



Jour. Cin. Soc. ii, 1880. 



s^RiCHNiTES, Billings, Cat. Sil. Foss. Antic, 1866. 

 Are names given to supposed tracks of cephalopods. 



GASTROPODA. 



Prosobranchiata [p. 103]. 

 Carelessness and habit have caused the retention of the old 

 order Scutibranchiata, notwithstanding the loss of its principal 

 distinctive characters. The position and development of the 

 branchise vary, usually according to the form of the shell, and 

 these no longer afford satisfactory characters ; although in the 

 Scutibranchiata the branchiae are more usually a pair, whilst in 

 the Pectinibranchiata one leaf is more or less abortive. The 

 scutibranchiates were formerly supposed to be androgynous, but 

 the sexes are now known to be separated, although the want of 

 a penis in the male pi'events them from being externally distin- 

 guishable. The shells of the first suborder of scutibranchiates, 

 the Podopthalmge, are not separable from the holostomate pectini- 

 branchs, such as Natica, although in general the pectinibranchs 

 are siphonostomate, the scutibranchs holostomate ; in the second 

 suborder, Bdriopthalma, the conical, non-spiral shells form a 

 good conchological character. 



For the first suborder (with the addition of the Fissurellidse 



