192. 
tubercles. Body-chamber two-thirds of a whorl long. Mouth- 
border falciform, ventral side with a forward directed process. 
a= 
Ft 
r : 
Fia. 38.—Schloenbachia Roissy- Fie. 39.—Schloenbachia Fie. 40.—Schloenbachia 
ana, d’Orb. cristata, Deluc. Goupilanus, d’Orb. 
Siphon large, mostly lodged in the high keel (fig. 38); this 
genus is entirely limited to the Cretaceous rocks, and figs. 41 
and 42 represent typical forms of the group. 
Il. Family Trorrripa, v. Mojs. 
‘Shell more or less richly ornamented, and provided with 
radial ribs, which almost always support tubercles or spiny 
processes on the border of the siphonal area. Runzelschicht 
and impression on the surface of the mantle entirely wanting.” 
Genus Trorires, v. Mojs.—“ Body-chamber from one and a 
half to one and three quarters of a whorl in length. The 
strong-ribbed sculpture is interrupted upon the ventral surface, 
and rises as a median keel on the same. The ventral side of 
the mouth-border projects forward in a short broad lappet; the 
last whorl seldom loses the form and sculpture of the inner 
whorls. The lobes are characterised by a broad saddle stem, 
with transverse incised branches, a transverse placing of the 
lobe points, great development of the chief lobes, and a remark- 
able diminution of the auxiliaries” (Moss). All the species are 
Triassic. Hx. Tropites Pamphagus, Dittm., Trop. Saturnus, 
Dittm. 
Genus TracuycEras, Lawbe.—Body-chamber short, from one 
half to two thirds of a whorl in length. The sculpture inter- 
rupted on the ventral surface (fig. 42). In some species there 
