TELLINIDA. 169 
those species. Among recent shells they are represented by Teil. 
concentrica, Gould (not td. Reuss or d’Orb.), and one or two 
others. For many years paleontologists have separated these 
shells from Tellina and applied to them the name of Arcopagia. 
T. metastriata, Conr. (exi, 61). 
ARCOPAGIA, Leach, 1827. Shell rounded-oval or orbicular ; 
two lateral teeth in one valve. T. fausta, Donov. (cxi, 62). 
PHYLLODA, Schum., 1817. Shell oblong, much compressed, 
posteriorly angular and carinated; cardinal teeth divergent, 
sublamellar. 7. foliacea, Linn. (exi, 63). 
ANGULUS, Schum., 1817. (Tellinula, Chemn. Fabulina, Gray, 
1851.) Shell oblong, subtriangular, compressed; anteriorly 
rounded, posteriorly more or less pointed or angulated ; a single 
lateral tooth in one valve. TT. polita, Say (cxi, 64, 65). 
TELLINIMERA, Conrad, 1860. (Tellimera, Conr., 1870.) Shell 
thin, elongated, subtriangular; right valve with three cardinal 
teeth, the shortest extending to the apex; left valve with two 
cardinal teeth, the posterior one bifid; no lateral teeth. Closely 
related to Angulus in form. 7. eborea, Conr. (cxii, 100). Cret. ; 
eS: 
TELLINIDES, Lamarck, 1818. Shell oval, compressed, slightly 
flexuous posteriorly; hinge with a single lateral tooth, contiguous 
to the cardinals. JZ. Timorensis, Lam. (cxi, 66). 
HOMALINA, Stoliczka, 1870. (Homala, H. and A. Adams, not 
Schum.) Shell oblong, compressed, inequivalve, inequilateral, 
anteriorly short, rounded ; posteriorly flexuous, obsoletely cari- 
nate, somewhat produced, narrowed; one lateral tooth near the 
hinge. T. triangularis, Chemn. (exii, 99). 
PERONHA, Poli, 1791. (Omala, Schum., 1817.) Shell oblong, 
oval; anteriorly short, rounded, posteriorly somewhat flexuous, 
subangulate ; lateral teeth obsolete. 7. planata, Linn. (cxi, 67). 
METIS, H. and A. Adams. Shell suborbicular, compressed, 
valves sillonated, posterior flexuosity submedian; no lateral 
teeth. 7. Meyeri, Phil. (cxii, 69). 
#NONA, Conrad, 1870. Shell subtriangular, inequilateral, 
hinge-margins equally declined, beaks not prominent, lunule 
very narrow, lanceolate, marked by a deeply impressed line ; two 
very small, widely diverging cardinal teeth in the right valve, 
one bifid and one rudimentary tooth in the left valve. 7. Hufa- 
lensis, Conrad (exii, 70). Cretaceous; U.S. 
[MAcTROMYA, Agassiz, 1842. This group, which I have placed 
in Anatinide (p. 149), Stoliezka classifies as a distinct genus 
of Tellinidz. Zittel refers species of Mactromya to several 
groups in Tellinidz and Paphiide. } 
ARCOPAGELLA, Meek. 
Distr.—2 sp. Cretaceous; U.S. A. Mactroides, Meek (cxii, 6). 
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