556 MOLLUSCA SUB-KINGDOM VI 
Family 1. Lecanitidae. Primitive discoidal shells like those of Prolecanitidae, 
with short rounded entire saddles and lobes like those of Ibergiceras, but ventral lobes 
divided hy short, comparatively broad and entire siphonal saddles. There are all stages 
in the development of these saddles, so that their aspect is rather variable. There are 
as a rule but two principal lateral saddles and lobes, with one auxiliary saddle and 
shallow lobe on either side in primitive species, but in others the number of auxiliaries 
may be considerably increased. Antisiphonal lobe entire, and often long and acute. 
The zygous dorsal lobes are very slight so far as known, and entire; merely marginals 
in the dorsal saddles. 
Paralecanites, Diener; Lecanites, Mojs.; Kymatites, Parakymatites, Waagen ; 
Proavites, Arthaber. Trias. 
Family 2. Badiotitidae. Discoidal and involute shells similar to Lecanites, 
especially in the dorsal sutures, but with well-defined costae and keeled venters. 
Includes Badiotites, Mojs. (Fig. 1140), and Doricranites, Hyatt. 
WII Trias. 
Family 3. Flemingitidae. A provisional group of discoidal 
forms having longitudinal ridges as in Cladiscitidae. The char- 
acteristics of Wyomingites connect it apparently with Lecanitidae, 
while in Flemingites the saddles are long and have a monophyllie 
Fic. 1140. aspect. There are, however, no truly monophyllic saddles at any 
Badiotites Eryx, Stage so far as known. The suture lines do not have the inner 
Munst. SP Pt? extensions common in Gyronitidae. Antisiphonal lobe bifid, its 
Sa sides entire, and zygous dorsal inflections limited in number; but 
the lobes are very broad, and their marginal saddles pointed, irregular in size. 
NXenodiscus, Xenaspis, Flemingites, Waagen; Wyomingites, gen. noy. Type W. 
(Meekoc.) aplanatum, White sp. Permian and Trias. 
Family 4. Meekoceratidae. Waagen (pars). Shells smooth, compressed, dis- 
coidal, and inyolute, and as a rule with narrow and more or less flattened venter. 
Sutures in many forms have a tendency to extend the inner lateral saddles or lobes, 
and to develop a corresponding series of auxiliaries; and this is carried to an excessive 
extent among some highly involute shells) The ventral lobes, however, are apt to 
remain broad and shallow ; their arms become highly denticulated except in Gyronites, 
where they are narrow and pointed as in Lecanitidae. Saddles entire and generally 
somewhat elongated and linguiform, but plainly of the Lecanites type. Antisiphonal 
lobe, so far as known, long, narrow, and bifid so far as known. Extremities of dorsal 
sutures produced and corresponding with inner parts of external sutures. 
Meekoceras, Hyatt; Nicomedites, Toula; Prionolobus, Gyronites, Beyrichites, Koninck- 
ites, Kingites, Aspidites, Proptychites, Clypites, Paranorites, Waagen; Aplewroceras, 
gen. nov. Type dA. (Cerat.) Sturt, Mojs. sp. Trias. 
Family 5. Prionitidae. Similar to Gyronitidae, but nodes, when they occur, 
are larger, and sutures have more or less pointed siphonal saddles, which are usually 
divided by a siphonal lobe. Dorsal sutures, so far as known, have fewer inflections 
and different outlines. 
Ophiceras, Griesh.; Vishnuites, Diener; Prionites, Goniodiscus, Waagen ; Aploco- 
ceras, gen. nov. Type A. (Din.) avisianus, Mojs. sp. Plococeras, gen. nov. Type P. 
(Din.) dalmatianus, Mojs. sp. Diaplococeras, gen. nov. Type D. (Din.) liccanus, Mojs. 
sp. Trias. Protophiceras, gen. nov. Type P. (Danub.) Nicolai, Diener. Trias. 

II. ArGocERATIDA. 
Apparently connected through primitive forms with Protophiceras, although sutwres of 
later stages in most forms depart widely from the discocampylic outline, and are quite 
similar to those of Pinacoceratidae. The auxiliary series, however, is highly inclined 
apicad as « rule, and develops differently. There are no adventitious inflections. 
