138 



EAST COAST BiARINE SHELLS 



the body whorl. The shell is whitish and 

 tinted with yellow. Length 16 mm. 



A beautiful little shell and the 

 only representative of the genus living in 

 shallow water upon our coast. 



PI. 52, Fig. 17 



Florida Keys and West Indies 



GENUS CYTHARA Schumacher 1817 



CYTHARA BALTEATA Reeve. Whorls bluntly and 

 slightly angulated in center; few ribs, 

 .these narrow and with wide smooth spaces 

 between; shell white with middle brown zone. 

 Length IS mm. 



Cape Hatteras, North Carolina to 



Barbados 



Family Cancellariidae 



GENUS CANCELLARIA Lamarck 1789 

 (CROSS-BARRED SHELLS) 



Shell strongly cancellated; strong 

 oblique folds upon columella; canal short. 



"The animal is very shy, rarely 

 showing more than the tips of the tentacles 

 beyond the front edge of the shell. It has 

 the power of considerably extending the 

 fore part of the foot, using it as an ex- 

 ploring organ." 



CANCELLARIA RETICULATA Linne. Netted 

 Cross-Bar. Whorls ribbed and grooved, the 

 ribs low and flat, crossed by weaker longi- 

 tudinal ribs; two prominent raised plaits 

 on columella; color yellowish white, with 

 brownish bands or variegations. Length 1.5- 

 2.5 inches. An albinlstic form of this has 

 been discovered at Marco, Florida. 



PI. 53, Fig. 11 



Cape Hatteras, North Carolina to 



Guadaloupe 



CANCELLARIA CONRADIANA Dall. Conrad's 

 Cross-Bar. A narrower shell than C. reticu- 

 lata. It is abundant in the Pliocene of 

 Florida but lives only at considerable 

 depths. 



PI. 43, Fig. 1 



Gulf of Mexico 



SUBGENUS TRIGONOSTOMA Blainville 1826 



CANCELLARIA TENERA Philippi (C. stimpsoni 

 Calkins). Delicate Cross-Bar. l\'horls 

 strongly shouldered, about thirteen nodules 



upon angle of last whorl and two less dis- 

 tinct rows of nodules below, between these 

 ribs of varying size; two plaits on columel- 

 la. Color yellowish or white. Length 20 mm., 

 usually less. 



A single fresh dead example was tak- 

 en on the beach at Boca Raton, Florida. It 

 occurs more frequently on the Florida Keys 

 and in the Pliocene beds near Clewiston, 

 Florida. 



PI. 51, Fig. 20 



Palm Beach County, Florida to West 



Indies 



GENUS ADMETE Kroyer 1842 



Canal absent or very short; shell 

 turreted; columella plaited. 



ADMETE VIRIDULA Jay. Greenish Admete. 

 Whorls five to six; three folds upon col- 

 umella; apex acute; spiral lines coarse; 

 axial ribs most prominent near shoulder; 

 epidermis thin but persistent. Length 12.5 

 mm. Depth range 10-60 fathoms. 



Rather abundant at times in stom- 

 achs of fish. It is frequently inhabited 

 by hermit-crabs. 



PI. 51, Fig. 22 



Labrador to Massachusetts Bay 



SUBCLASS OPISTHOBRANCHIA 



ORDER PLEUROCOELA 



Family Acteonldae 



Shell small or minute, spirally 

 grooved on suture, whorls few, outer lip 

 thin and simple, inner lip or columella 

 twisted to form a fold; no folds or teeth 

 upon adjacent wall. 



GENUS ACTEON Uontfort 1810 



ACTEON PUNCTOSTRIATUS C. B. Adams. Broken- 

 Line Acteon. Shell minute, white, whorls 

 four to five, last one large, lower half of 

 same with revolving punctured lines; suture 

 deep and bordered with revolving grooves; 

 color variable. Length 3-6 mm. 



Fresh dead specimens are frequent 

 upon the inner sandbars near the North In- 

 let at Palm Beach, Florida. 



PI. 53, Fig. 3 PI. 71, Fig. 22 



PI. 65, Fig. 17 



Cape Cod southward to Haiti 



