Crepidulidae 131 



Egg capsules of Crepidula foniioata (Linne) PI. 47, figs. 329a, b, c 



Crepidula macnlosa^si Conrad PI. 48, fig. 330 



Length, 32 mm., breadth, 25 mm. Nearly oval, convex, smooth, 

 with faint growth lines; creamy white, with brownish spots irregu- 

 larly interspersed; interior white, thm enough to show spots faintly 

 through the shell; diaphragm less than half the opening, the margin 

 being slightly concave. 



This Crepidida has formerly been grouped with C. fornicata, but 

 upon closer examination is found to be uniformly ovate, the dia- 

 phragm extending into the apex and regularly of less height com- 

 paratively, than m C. fornicata. 



Crepidula g'lauca-^^ convexa Say PI. 48, fig. 331 



Length, 12; width, 8 mm. Shell resembles C. fornicata but is 

 much smaller, more convex, side of shell toward which apex in- 

 clines is more nearly vertical. Internal septum deep-seated and 

 convex. 



Found attached to the convex surfaces of other shells. The 

 authors have seen great numbers of these small mollusks attached 

 to blades of eel grass on the tidal flats of Sanibel Island. 



Crepidula plana-^s Say PI. 25, fig. 174 



Length to 30; width to 16 mm. Shell flattened, oblong-oval, 

 white; yellowish epidermis; apex terminal, directed to left, depressed 

 to surface plane; smooth but for coarse growth lines; interior pol- 

 ished; diaphragm almost half the length of shell, highly convex to- 

 ward free margin, edge concave at center, usually notched at one 

 side. 



C. plana may be attached to almost any submerged object; 

 within bottles, to the interior of univalve shells, on oyster and 

 scallop shells and attached to the upper surface of shells of its own 

 species. Wherever the mollusks may be attached, the growing shell 

 becomes adapted to the curvature and sculpture of its resting place 

 — externally concave within the apertures of univalve shells, ribbed 



2^^ Lat., macula, spotted. 

 -3- Gr., glaukos, green-blue. 

 -^^ Lat., planus, level, flat. 



