THE NAUTILUS. 
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Genus MULINIA Gray, 1838. 
Type M. typica Gray (=M. edulis King). 
(=Moulinea Phil., 1853, -f -Mulinea Conr., 1867.) 
Mulinia lateralis Say, 1S22. New Brunswick to the West Indies. 
=Mactra subtruncata Greene, 1833 ; not Da Costa, 1788. 
Mulinia lateralis var. corbuloides Deshayes, IS54. Mostly southern. 
=Mactra rostrata Phil., 1848, not Spengler, 1802. 
Mulinia guadelupensis Recluz, 1S52. West Indies. 
=Mactra cantrainei Reeve, 1854; -\-M. portoricensis Shuttlew., 
1856 ; -\-M. donadformis Auet. non Gray ; -j -M. tumida and turgida 
Guppy, non Gmelin. 
Genus GNATHODON Gray, 1831. 
Type G. cuneatus Gray, 1831. 
( =Rangia Desm., 1832, -| -Clathrodon Conrad, 1833 ; -f -Peris- 
sodon Conrad, 1863 ; -(- Columbia Blaiuville, mss., 1834.) 
Gnathodon cuneatus Gray, 1S31. Gulf of Mexico. 
=Rangia cyrenoides Desm., 1832. 
Gnathodon cuneatus var. nasutus Dali, 1894. Texas. 
Subgenus Rangianella Conrad, 1863. 
Gnathodon flexuosus Conrad, 1839. Gulf of Mexico. 
= G. rostratus Petit, 1853. 
Gnathodon flexuosus var. Petitianus Dali, 1894. Mexico. 
Genus LABIOSA (Schmidt) Holler, 1832. 
Type Mactra anatina Spengler, 1802. 
(=Anatina Schumacher, 1817, non Lamarck, 1809, -(- Cypricia 
Gray, 1840 ; -f -LeucopaHa Mayer, 1867.) 
Labiosa lineata Say, 1822. New Jersey to San Paulo, Brazil. 
—Mactra nuttallii Reeve, 1854, non Conrad ; -j -M. recurva Gray, 
1828; -\-M. papyracea Auet. non Lamarck. 
Subgenus Raeta Gray, 1853. 
Type L. canaliculata Say, 1822. 
(= Cryptodon H. & A. Adams, not of Turton or Conrad, -\-Lovel- 
lia Mayer, 1867.) 
