O. F. Matthew — On the Genus Stenotheca. 425 



Halitherium Serresii, Gervais. Pliocene : Montpellier ; d'Estres (Bouches-du- 



Rhone) . 

 fossile, Cuv. sp. Miocene : St. Maure, Loire ; Angers, Rennes, Morbihan. 



Beaiimontii^ Christol, sp. Miocene : Beaucaire, Gard. 



Gnettardii, d,^ '^X-alvsw . MioceJie?: Etrecliy (Seine), etc. 



sp. 



dubium, Cuv. Eocene : Blaye, Gironde. 



hellunense, Zigno, 1875. Miocene : Belluno, Venetia. 



angicstifrotis, Zigno, 1875- Miocene : Belluno. 



ciirvidens, Zigno, 1875. Miocene : Belluno. 



veronense, Zigno, 1S75. Miocene: Belluno. 



Schinzi, Kaup, 1855. Miocene : Darmstadt ; Miocene : Malta. 



Canhami, Flower. Crag (derivative) : Suffolk. 



Ciivieri, Owen. Miocene : Montpellier. 



sp., Van Beneden. Miocene (" Bolderian ") : Elsloo, near Maestricht. 



{Chirot/ierhcm) Brocchii, Bruno (Owen, cit.). Miocene: Herault. 



sp., Zigno. Miocene : Chalaif, Isthmus of Suez. 



Hemicatdodon effodiens. Cope. Eocene : Shark River, New Jersey, U.S. 

 Manatus Cotdoi7ibi. Filhol (1878) (named after M. Coulomb, the discoverer). From 



the Eocene ? Quarries, Mokattam, near Cairo (founded on three teeth of lower 

 jaw like the Manatee). 



inoniatiis, Leidy. Miocene ? : Phosphate beds. South Carolina. 



Pachyacanthtis trachyspondylus, Brandt (in part). Van Beneden, emend., 1875. 



Miocene : Nussdorf, near Vienna. (Based on vertebrse and ribs of a Sirenian.) 

 Pro7-astomus sirenoides, Owen. Tertiary : Jamaica. 

 Rhytina gigas, Zimmermann (Geograph. Gesellsch. 1780). Pleistocene : Beliring's 



Island, = Rhytina Stelleri, Desmarest, 1819. 

 Rhyiiodus Capgrandi, Lartet. Pliocene : Basin of the Garonne. 

 T7-achythermm Raulini, Gervais. Miocene : La Reole, Gironde. 



V. — Note on the Genus Stenotheca. 

 By George F. Matthew, of St. John's, New Brunswick. 



AS facts relative to the earliest forms of Molluscs are of interest 

 to the naturalist as well as the geologist, I offer this note on 

 the genus Stenotheca, derived from a study of the remains of several 

 species occurring in the Cambrian rocks of Canada. The formation 

 in which they are found is the St.-John Group, a formation occurring 

 in the Southern part of the Province of New Britnswick ; and the 

 geological horizons are those of the Solva and Menevian Groups 

 of Wales, equivalent to the Paradoxides-Ttsseni beds, and overlying 

 measures of Etage 1, of the Norwegian geologists. The fossils are, 

 therefore, of great antiquity, having preceded any known Lamel- 

 libranchs ; and, except the Ifetoptoma Barrandei of Linnarsson, 

 I know of no Gasteropods of equal antiquity. 



The genus Stenotheca was proposed in 1872 by Dr. Henry Hicks, 

 to include a minute corrugated shell found in the Menevian Group 

 of Wales. It is described by Dr. Hicks as '• a curved shell " — 

 " a small wide form, with lines of growth strongly marked on its 

 surface." The genus is represented in Division Id of the St.-John 

 Group by several small compressed species, none of which appear to 

 be identical with St. cornucopia, the type of the genus. 



Dr. Hicks places this genus in the Pteropods (Quart. Journ. Geol. 

 Soc. May, 1875, p. 192). If I am right in referring our sliells to his 

 genus, there seem to be features which indicate <ireater affinities to 



