140 Marine Shells of the Western Coast of Florida 



in a series of specimens. 



From one to thirty fathoms. 



Family CERITHIOPSIDAE 



Shells of the Cerithiopsidae are small, cylindrical, many whorled 

 with spiral sculpture and short anterior canal. 



Distribution principally in northern and temperate seas at con- 

 siderable depths. 



Genus CERITHIOPSIS Forbes and Hanley, 1851 

 Cerithiopsis-50 greeni (C. B. Adams) PI. 27, fig. 190 



Alt., 4.5 mm. Shell small, cylindrical, swollen in the middle, 

 apex acute; color dark reddish brown; 10 to 12 whorls; sutures ex- 

 cavated. Spiral sculpture of three rows of tubercles, so placed that 

 an eflFect of longitudinal ribbing is produced; interspaces and sutures 

 with fine striations. Aperture oval, outer lip sharp; short, oblique, 

 anterior canal; operculum corneous. 



Subgenus LASKEYA Iredale, 1918 



Cerithiopsis emersonii (C. B. Adams) ["C. subulata (Montagu)"] 



PI. 27, fig. 191 



Alt., 10-14 mm. Shell small, brown cylindrical, apex acute; 10 

 to 15 flat whorls; sutures distinct, channeled; axial ribs cancellated 

 by two strong grooves into nodulous spirals, three on whorls of 

 spire, four on body whorl; general effect of sculpture spiral rather 

 than longitudinal; base slightly concave with two prominent spiral 

 ridges; aperture small, subquadrate, about one-sixth of shell, canal 

 less than one-half of aperture, columella spirally twisted; operculum 

 corneous. 



From one to fifteen fathoms. 



Lives commonly among sponges. Eggs in holes bitten in sponge in 

 little nests, singly and well separated. Capsules 0.35 mm. across. Eggs 

 about 0.03 mm. in diameter. — Marie Lebour. 



Genus SEILA A. Adams, 1861 



Seila252 adainsii (H. C. Lea) PI. 27, fig. 192 



Alt., 10 mm. Shell brown, elongate cylindrical, apex acute; 10 



250 Gr., keration, little horn — irregular form; ops'is, appearance. 

 25^ Lat., subula, an awl. 

 252 Gr_^ seira, cord, string. 



