THE NAUTILUS. ae 
Genus MULINIA Gray, 1838. 
Type M. typica Gray (— WM. edulis King). 
(=Moulinea Phil., 1853, + Mulinea Conr., 1867.) 
Mulinia lateralis Say, 1822. New Brunswick to the West Indies. 
= Mactra subtruneata Greene, 1833 ; not Da Costa, 1788. 
Mulinia lateralis var. corbuloides Deshayes, 1854. Mostly southern. 
=Mactra rostrata Phil., 1848, not Spengler, 1802. 
Mulinia guadelupensis Reeluz, 1852. West Indies, 
=Mactra cantrainei Reeve, 1854; +M. portoricensis Shuttlew., 
1856; +M. donaciformis Auct. non Gray; +. tumida and turgida 
Guppy, non Gmelin. 
Genus GNATHODON Gray, 1831. 
Type G. cuneatus Gray, 1831. 
(=Rangia Desm., 1832, +-Clathrodon Conrad, 1833 ; +-Peris- 
-sodon Conrad, 1863; + Columbia Blainville, mss., 1834.) 
Gnathodon cuneatus Gray, 1831. Gulf of Mexico, 
—Rangia cyrenoides Desm., 1832. 
Gnathodon cuneatus var. nasutus Dall, 1894. Texas. 
Subgenus RANGIANELLA Conrad, 1868. 
Gnathodon flexuosus Conrad, 1839. Gulf of Mexico. 
= G. rostratus Petit, 1853. 
Gnathodon flexuosus var. Petitianus Dall, 1894. Mexico. 
Genus LABIOSA (Schmidt) Moller, 1832. 
Type Mactra anatina Spengler, 1802. 
(=Anatina Schumacher, 1817, non Lamarck, 1809, + Cypricia 
Gray, 1840; + Leucoparia Mayer, 1867.) 
Labiosa lineata Say, 1822, New Jersey to San Paulo, Brazil. 
=Mactra nuttallii Reeve, 1854, non Conrad ; + MW. recurva Gray, 
1828; +M. papyracea Auct. non Lamarck. 
Subgenus RaEra Gray, 1853. 
Type ZL. canaliculata Say, 1822. 
(=Cryptodon H. & A. Adams, not of Turton or Conrad, + Lovel- 
lia Mayer, 1867.) 
