310 American Seashells 



Eubranchus pallidus Alder and Hancock Painted Balloon Eolis 



Plate i5h 



Arctic Seas to Boston, Massachusetts. Europe. 



% inch in length, characters as shown in our figure and the generic 

 description. Uncommon (?), 



Genus Coryphella Gray 1850 



Branchiae numerous, clustered, elongate or fusiform. Foot narrow, 

 with the anterior angles much produced. Radula with a single longitudinal 

 series of central teeth which bear a large central denticle and several marginal 

 denticles. There is a denticulated lateral tooth on each side of the central. 



Coryphella rufibranchialis Johnston Red-fingered Eolis 



Plate 15a 



Arctic Seas to New York. Europe. 



I inch in length, characters as shown in figure and in the generic de- 

 scription. Common (?) in New England. 



Subclass PULMONATA Order BASO MM ATOP MORA 



Family SIPHON ARllDAE 

 Genus Siphonaria Sowerby 1824 



Shells closely resembling the true limpets, Acmaea, but at once distin- 

 guished by the nature of the muscle scars on the inside. In both, the long, 

 narrow scar is horseshoe-shaped, but in Siphonaria the gap between the ends 

 is located on one side of the shell, while in Acmaea it is located at the front 

 end. In some Siphonaria, the area near the gap is trough-shaped. These 

 are air-breathers and are more closely related to the land garden snails than 

 to the gill-bearing, water-breathing limpets. 



Siphonaria pectinata Linne Striped False Limpet 



Figure 65b 



Eastern Florida, Texas, Mexico and St. Thomas. 



I inch in length, rather high, with an elHptical base. Exterior with 

 numerous, fine, radial threads or rather smoothish. Color whitish with nu- 

 merous, brown, bifurcating, radial lines. Interior glossy, similarly striped. 

 Center cream to brown. Muscle scar with 3 swellings, the gap occurring be- 

 tween the two at the side. Do not confuse with Acmaea leiicopleura which 

 commonly has a blackish owl-shaped figure inside. Common along the shores 

 on rocks. This is S. ?iaufragum Stearns and S. lineolata Orbigny. 



