374 Systematic Paleontology 



" It is true that Dn Morton also referred doubtfully to N. dekayi under 

 the provisional name of N. perlatus, a more compressed form from Ala- 

 bama, that would doubtless agree more nearly in the outline of its aper- 

 ture, and in several other respects, with some of the Indian forms, as well 

 as with the Chilean N. orbignyanus Forbes. I have not seen specimens 

 of the Alabama shell showing the position of its siphuncle, but I very 

 much doubt its identity (judging from its form only) with N. dekayi 

 proper, as I have seen no tendency among our specimens (that do not 

 differ also in the position of the siphuncle) to assume this more com- 

 pressed form." — Meek, 1876. 



Type Locality. — Monmouth and Burlington counties, New Jersey. 



This species occurs in Maryland in the form of well-preserved casts to 

 which portions of the very thin, nacreous shell are still adherent. 



Occurrence. — Monmouth Formation. Brightseat, Brooks estate near 

 Seat Pleasant, 3 miles south of Oxon Hill, Prince George's County. 



Collection. — Maryland Geological Survey. 



Outside Distribution. — Monmouth Formation. Navesink marl, Red 

 Bank sand, New Jersey. Ripley Formation. Exogyra costata zone. 

 Extreme top of zone, North Carolina. Ripley Formation. Exogyra cos- 

 tata zone, Eufaula, Alabama; Pontotoc, Tippah and Union counties, Mis- 

 sissippi. Selma Chalk. Exogyra costata zone, Wilcox County, Tombigbee 

 River and Sumter County, Alabama ; east-central Mississippi. Arrialoor 

 Formation. Southern India, Aff. Nautilus bouchardianus d'Orbigny. 



Order AMMON01DEA 



Suborder EXTRASIPHONATA 



Family LYTOCERATIDAE 



Genus BACULITES Lamarck 

 [Prodr. de Pal., 1799, p. 80] 

 Type. — Baculites vertebralis Lamarck. 



Shell slender, subcylindrical or elongate-conical in the adult stages, 

 more or less compressed laterally, especially upon the posterior side ; cross- 

 section ovate-trigonal or subcircular, living chamber large, produced into 

 Etymology: Baculus, a staff. 



