348 APPENDIX. 
Litvires, Breyn [p. 56]. 
Add to synonymy Ancistroceras, Boll (part), 1857. 
Naurtitus, 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) collectus, M. and 
W., is described from Indiana. 
PLEURONAUTILUS, Mojsisovics, 1882. Triassic; Europe. 
Ammonites, Brug. | p. 60]. 
Mojsisovies has characterized the following new Ammonite 
genera in ‘“ Cephalopoden der Mediterranean Triasprovins,” 
1882 :— 
DINARITES, KLIPSTEINIA ( Ceratite). 
CELTITES ( Tropite). 
PROCLADISCITES ( Arceste). 
BENECKEIA, LONGOBARDITES, LECANITES, NANNITES, GYMNITES, 
STURIA (Pinacocere). 
PETALICHNUS, TERATICHNUS, TRACHOMATICHNUS, S. A. Miller, 
Jour. Cin. Soe. ii, 1880. 
SEHRICHNITES, 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 
branchiz vary, usually according to the form of the shell, and 
these no longer afford satisfactory characters; although in the 
Scutibranchiata the branchiz 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 prevents them from being externally distin- 
guishable. The shells of the first suborder of scutibranchiates, 
the Podopthalmee, 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, Edriopthalma, the conical, non-spiral shells form a 
good conchological character. 
For the first suborder (with the addition of the Fissurellide 
