rpani. SS.] 1*^ATURAL HISTORY SOCIETY. 117 



Ciione limcvc'ma., Phipps. Gelatinous, pellucid, pale blue, hya- 

 line ; mouth and end of body scarlet when out -of water ; wingF 

 ■ovate, pointed ; tail acute. L. 25. — Maine*. 



Order OPISTHOBRANCHIATA. 



Mollusks with a flat foot ; gills usually }»resent and exposed, 

 but sometimes absent ; the branchial veins open into the auricle 

 behind the ventricle; usually without a shell; the shell, when 

 present, thi-n and wholly or partially concealed by the animal. 



Suborder TEOTIBRANCHIATA. 

 With one exception, the animal in all the species included in 

 this work is provided with a small spiral shell ^vhich is often 

 partly or completely enclosed in the reflected margin of the 

 mantle or foot; gills usually on the right hand side, and always 

 hidden. 



Family 37. ACT/EONID/E, 



Only represented by deep water species ; the following found 

 iin rather shallow water. 



1. Action, Montf. 



Shell solid, ovate, with a conical, many-whorled spire; spir- 

 ally grooved, or punctate-striate ; aperture long, narrow, round- 

 ed in front; outer lip sharp; columella with a strong, tortuous 

 fold ; operculum horny, elliptical, lamellar. Animal white ; 

 head truncated, and slightly notched in front, furnished pos- 

 teriorly with recumbent, tentacular lobes, and small eyes near 

 their inner bases; foot oblong, lateral lobes slightly reflected on 

 the shell. 



1. Actseon yunoto- striata, C. B. Ad. Shell minute, elongated, 

 oval ; spire sharply pointed ; whorls shouldered at the suture 

 which is somewhat. channeled; body whorl smooth above the 

 aperture, but below it is marked with 10-15 revolving lines 

 formed by minute punctures ; outer lip sharp and regularly 

 curved ; pillar-lip with a prominent fold. White. L. 2J ; D. 

 If ; A. 60° ; W. 4-5 ; Ap. i.— N. Y. and Mass. 

 Family 38. TORNATINID/E. 



Shell external, spiral, more or less cylindrical, usually white ; 

 no operculum. Animal with a depressed head, triangular or 

 four sided ; eyes at the outer bases of tentacular lobes. 



