SECOND, OR SCHLOTHEIMIAN BRANCH. E39 
Schlotheimia rotunda, Hyarv. 
Amm. lacunatus rotundus, QuENsT., Amm. Schwab. Jura, p. 167, pl. xxii. fig. 5, 6. 
This shell is more discoidal than any others described below. The whorls are 
also stouter as arule. The pilz on the umbilical shoulders are coarser and are 
tuberculated according to Quenstedt’s figures and descriptions. Amm. lacunoides, 
Quenst.," may be the young of this or an allied species. It occurs so far as 
now known only in South Germany. 
Schlotheimia lacunata, Hyarrv. 
Am. lacunatus, BuckMAN, Murch. Geol. Cheltenh., 2d ed., p. 105, pl. ii. fig. 4, 5. 
Amm. lacunatus, Quenst., Amm. Schwab. Jura, p. 167, pl. xxii. fig. 1-4. 
Amm. lacunatus, Dum., Etud. Pal. d. Bas. d. Rhone, p. 120, pl. xxi. fig. 18-20. 
Amm. lacunatus, Wrigut, Lias Amm., p. 330, pl. lvi. fig. 16-18. 
Amm. deletum, CANAVARI, Lias v. Spezia, Paleontogr., X XIX. pl. xviii. fig. 18. 
Amm, sp. ind. efr. lacunata, CANAVARI, Fauna del Lias, Mem. del. Carta Geol. d’ Italia, II., 1888. 
Localities. —St. Thibault, Semur. 
The pile are not coarse or tuberculated at the umbilical shoulders. The 
whorl is also more compressed and the involution greater than in Schiot. rotunda, 
covering about two thirds of the side. The young according to the figures given 
are also not smooth to so late a stage as in that species. The description of the 
originals in the Geology of Cheltenham in a measure makes up for the figures. 
The latter belong to a discoidal species, the former gives the usual combination 
of an involute shell, narrow abdomen, flattened sides, and half-concealed whorls. 
An important statement is also added, that the “ribs” cross the abdomen in the 
young. The latter indicates the possibility of a direct derivation of the second 
subseries from Schiot. catenata, and also serves to confirm the identification of 
Wright's species with this, since Wright mentions the same characteristics. 
Schlotheimia Geyeri, Hyarr. 
Schlot. lacunaius, Geyxr, Liasis. Cephal. v. Hierlatz b. Hallstadt, p. 259, pl. iii. fig. 22, 23. 
This species has fine but sparsely distributed pile at the umbilical shoulders 
which speedily divide into two or more finer pile. The abruptness of the divis- 
ion gives the umbilical pile a resemblance to those of Schlot. Quenstedti in Geyer’s 
figures, but there are no tubercles, and the involution covers about four fifths of 
the side, and the whorls are considerably compressed. 
Schlotheimia angustisulcata, Guyer. 
Schlot. angustisulcata, GEYER, Liasis. Ceph. Hierlatz b. Hallstadt, p- 256, pl. iil. fig. 24, 25. 
The pile are finer, the whorls more compressed, the involution quite as exten- 
sive as in the preceding. The sutures which are figured in this species, if they 
can be correctly given in so small a figure, are quite distinct from those of the 
similar involute forms of Schlotheimia. 
1 Amm. Schwab., p. 162, pl. xxi. fig. 24, 25. 
