ACTAEONIDAE AND AcTEOCINIDAE 191 



Order PLEUROCOELAss* 

 Family ACTAEOJflDAE 



The members of this family are small mollusks of world-wide 

 distribution, having a long history in the geologic past. Most of 

 the species are from deep water. 



The shells are of small size, ovate, with short, elevated spire, 

 large body whorl with the aperture produced and widened below. 

 The columella has one oblique fold. 



Genus ACTAEON Montfort, 1810 

 Actaeon punctostriatus^ss (C. B. Adams) PI. 39, fig. 277 



Alt., 3-6 mm. Shell small, thin, white, or faint rosy-brown, 

 thin epidermis; spire elevated; nucleus a little tilted from vertical 

 axis; four rather convex whorls; body whorl large, sutures deeply 

 channeled. Sculpture of one or more revolving, subsutural grooves, 

 body whorl smooth below suture with revolvmg, incised, punctate 

 striations over basal half. Aperture about half length of shell, wide 

 and produced at base; columella with one strong oblique fold; oper- 

 culum corneous. 



From one to sixty-three fathoms. 



Family ACTEOCINIDAE 



This is a family of small mollusks native to warm seas. 



The shells are small, cyhndrical or fusiform and characterized 

 by elevated spire with mammillar nucleus, channeled sutures, and 

 plicate columella. 



Genus ACTEOCINA Gray, 1847 

 Acteocina canaliculatasss (Say) PI. 39, fig. 278 



Alt., 3.5 mm. Shell small, cylindrical, thin, white, translucent; 

 four or five whorls, sutures deeply channeled; spire depressed, apex 

 mammillar, deflected from vertical axis; body whorl large; aperture 

 long, narrow, widened and slightly produced at base; outer hp 

 arched forward; columella with strong, oblique basal fold; no oper- 

 culum. 



2^* Gr., pleura, rib, side ; koile, hollow. 



2^^ Gr., Aktaion, a huntsman; Lat., punctum, point; striatus, striated 



356 Lat., canaliculatus, channeled. 



