554 MOLLUSCA SUB-KINGDOM VI 
Margarites (Fig. 1135), Tropites (Figs. 1092, C, 1100, 1136), (Paratropites, Ana- 
tropites, Microtropites), Barrandeites, Silbyllites, Mojs. ; Eutomoceras, Hyatt. Trias. 
Family 9. Haloritidae. Mojsisovics (pars). Shells more globose and more 
involute in the young than Tropitidae, and as a rule keelless, but having similar 
volutions in a number of species during later stages. Ornament as a rule simpler than 
in Tropitidae. Aperture usually with ventral crests, but these are primitive in outline, 
broad, and in some species scarcely indicated by the lines of growth. 
Halorites (Homerites), Jovites, Parajuvavites, Juvavites (Anatomites, Griesbach- 
ites, Dimorphites), Miltites, Sagenites (Trachysagenites), Mojs. Trias. 
Sub-Order E. GLOSSOCAMPYLI. Hyatt. 
Primitive species exhibit close resemblance to Prolecanitidae, but differ in the greater 
number and simpler forms of the tonque-shaped saddles and lobes. Specialised shells have 
the saddles acute, but still entire and of the same fundamental outlines, while the lobes 
become bifid or digitated. Adventitious lobes and saddles are introduced by division of 
the siphonal saddles, and generally show reminiscence of their primitive ancestral outlines. 
Stphuncle as in preceding groups, devoid of a calcareous sheath ; funnels monochoanitic 
and short in primitive genera (Pharciceras), but becoming chlotochoanitic in specialised 
forms. Antisiphonal lobe entire in primitive, but bifid in more specialised shells. 
Two pairs of entire dorsal saddles and one pair of zygous lobes with rounded 
outlines appear in Sandbergeroceras, but in more involute and specialised genera the 
dorsal inflections beeome more numerous ; their outlines remain comparatively simple, 
however, except in Hedenstroemitidae. There is a general tendency in this sub-order 
toward the multiplication of lobes and saddles, and these are added at both external 
and internal ends of the lateral sutures. The lobes and saddles are less differentiated, 
or are more alike, than in preceding 
groups throughout the entire lateral | ” ie : 
line. The sutures of Pharciceras, monn we S\ wo ; 
however, show the presence of large 
internal saddles in some species, indicating 
derivation from Magnoseilaridae. 
Family 1. Pharciceratidae. More 
or less discoidal shells resembling Anar- 
cestes, but having the lobes and saddles like 
those of Beloceratidae, with, however, 
simpler and more rounded outlines. No 
adventitious inflections are developed. 
Ventral lobe undivided, and antisiphonal 
lobes entire. Aperture with large hypo- 
nonue sinus, ; 
Pharciceras, Sandbergeroceras (Triano- 
ceras), Hyatt (Fig. 1137); Hoeninghausia, 
Giirich, Devonian.  (?) Beneckia, Mojs. 
Trias. 
ry Yr 

Iie. 1137. 
Suture-line of Sandbergeroceras Fig. 1138, Z 
tuberculoso-costatum, Sandb. Upper Beloceras multilobatum, Beyr. sp. Upper 
Devonian. Devonian ; Adorf,' Westphalia. 
Family 2. Beloceratidae. Frech. Includes only the genus Beloceras, Hyatt 
