CYMBULIIDA. 93 
COLEOPRION, Sandberger. Shell round, tapering. sides obliquely 
striated, strive alternating along the dorsal line. C. gracilis, 
Sandb. Devon.; Germany. 
coLEoLus, Hall, 1879. Shell tubuliform, straight or slightly 
curved, rather thick, smooth within; surface more or less 
obliquely grooved, and sometimes longitudinally striate.  C. 
aciculus, Hall. Devonian; U.S. 
HERMICERATITES, Hichwald, 1840. 
Distr.—Fossil, 3 sp. Middle Silurian; Russia. 
Shell cylindrical or semicylindrical, elongated, straight, with 
a dark brown corneous epidermis, furnished with a straight, 
median siphuncle, which does not traverse any chambers. 
Very doubtful pteropods ; might as well be referred to Ceph- 
alopoda. 
SALTERELLA, Billings, 1861. 
Dedicated to Mr. J. W. Salter, late Paleontologist to the 
Geological Survey of Great Britain. 
Distr.—Fossil, 3 sp. Lower Silurian; Canada. 
Shell small, slender, conical, straight, consisting of many cones 
‘placed one within the other; the transverse section of the tubes 
is circular or subtriangular; the surface is transversely or longi- 
tudinally striated. This is very probably an Annelid; as is also 
Tentaculites, Schloth. 

Famity CYMBULIIDA. 
Animal oval, with large rounded wings. Dentition 1-1-1; the 
central tooth very large, the laterals wide at the base, unicuspid. 
Shell symmetrical, subinternal, cartilaginous, slipper-like. Km- 
bryos with a caducous, operculated, testaceous, spiral shell. 
CyMBuULIA, Peron and Lesueur, 1810. 
Htym.—Diminutive of cymba, a boat. 
Distr.—3 sp. Atlantic, Mediterranean, Indian Ocean. C. 
proboscidea, Peron (xlii, 17). 
Shell cartilaginous, slipper-shaped, spinous, pointed in front, 
truncated posteriorly ; aperture elongated, ventral. 
Animal with large rounded fins connected ventrally by an 
elongated lobe; mouth furnished with minute tentacles ; stomach 
muscular, armed with two sharp plates. 
TIEDEMANNIA, Chiaje, 1839. 
Named after Fr. Tiedemann. Syn.—Gleba, Forskal. 
Distr.—3 sp. Mediterranean, Australia. 7’. Neapolitana, 
Chiaje (xlii, 18). 
Animal naked, transparent, fins united, forming a large rounded 
