MANUAL OF CONCHOLOGY. 



MONOGRAPH OF THE FAMILY SOLARIIDJE, 



BY WILLIAM B. MARSHALL, B. S., 



Assistant, Conchological Museum of the Academy of Natural Sciences 

 of Philadelphia. 



FAMILY SOLAEIIDJE. 



Shell depressed conic, turbinate, or planorbiform ; aperture 

 entire, angular or subcircular ; lip and coluraella simple, interior 

 without nacre ; umbilicus wide and deep and usually with crenu- 

 lated margins; main sculpture usually spiral. Operculum corne- 

 ous, spiral. 



Animal with very large, oval foot, notched in front ; tentacles 

 cylindrical, thick, with eyes sessile on swellings near their outer 

 bases. Dentition variable. In Solarium (PI. 1, figs. 5/6) and 

 Philippia (PI. l,fig. 8) the teeth are long, spiniform, pronged and 

 without a central tooth. In Torinia (PI. 1, figs. 11, 12) there is 

 a small central tooth, a lateral tooth with pectinated and incised 

 eclge united to the central tooth, and two marginal teeth which 

 are straight and digitated at their extremities. The jaw of So- 

 larium and that of Philippia are figured on PI. 1, figs. 4 and 7. 



The proper systematic position of the family Solariidae was 

 long a matter of doubt. By most authors it was assigned to the 

 neighborhood of Trochidae. Gray in 1847 (Zool. Proc., p. 151), 

 substituted for Solarium the name Architectoma, which was 

 evidently a typographical error for Architectonica, Bolt., and 

 placed the genus in the Littorinidae. In 1850 (Figs, of Moll. 

 Anim.), he raised the genus to the rank of a family, and naming 

 it Architectomidae, he placed it between the Littorinidae and 

 Melanidae. In 1853 (Zool. Proc., p. 394), believing the animal 

 to be without teeth, he placed the family in his group Gymno- 



(3) 



