CYMBULIID^. 93 



COLEO PRION, Sandberger. Shell round, tapering, sides obliquely- 

 striated, strife alternating along the dorsal line. G. gracilis, 

 Sandb. Devon.; Germany. 



coLEOLUS, Hall, 18Y9. Shell tubuliform, straight or slightly 

 curved, rather thick, smooth within ; surface more or less 

 obliquely grooved, and sometimes longitudinally striate. G. 

 acicidus, Hall. Devonian ; U, S. 



Hermiceratites, Eichwald, 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 an}^ chambers. 



Yery doubtful pteropods ; might as well be referred to Ceph- 

 alopoda. 



Salterella, Billings, 1861. 



Dedicated to Mr. J. W- Salter, late Palaeontologist to the 

 Greological 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 probabl}^ an Annelid ; as is also 

 Tentaculites, Schloth. 



Family CYMBULIID^. 



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. Em- 

 bryos with a caducovTS, operculated, testaceous, spiral shell. 



Cymbulia, Peron and Lesueur, 1810. 



Etym. — Diminutive of cymba, a boat. 



Distr. — 3. sp. Atlantic, Mediterranean, Indian Ocean. G. 

 probosoidea, 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. T. Neapolitana, 

 Chiaje (xlii, 18). 



Animal naked, transparent, fins united, forming a large rounded 



