188 University of California Publications in Geology [Vol. n 



Family Acteonidae 

 Genus ACTEON Monti 



ACTAEON KIEKERENSIS, n. sp. 

 Plate 22, figure 9 

 Type specimen 11254, Coll. Invert. Palae. Univ. Calif., loc. 76 



Shell fairly large for this genus ; spire acute ; number of whorls seven, with 

 sides gently concave; body whorl large and rather ventricose; sutures distinct 

 and narrowly channeled. Surface of shell sculptured by numerous spiral ribs 

 with interspaces about as wide as the ribs ; four or five spiral ribs on each whorl 

 of spire, and about twenty-three on body whorl. Aperture elongate-ovate ; 

 columella area with the typical depression-fold of this genus. 



Dimensions. — Height, about 12 mm.; height of spire, about 4.5 mm.; greatest 

 width of body whorl, 8 mm. 



Occurrence. — University of California locality 78. 



This form appears to be distinct from any of the known species 

 of this genus. The species that it seems to resemble the most is 

 Aceton traskii Stearns, 158 from which it differs in being heavier 

 and broader in proportion to the height, the body whorl being more 

 ventricose and the interspaces between the spiral ribs broader. 



Family Scaphandridae 

 Genus CYLICHNA Lovin 

 CYLICHNA RAMONENSIS, n. sp. 

 Plate 20, figure 7 

 Type specimen 11218, Coll. Invert. Palae. Univ. Calif., loc. 1131 



Shell small, elongate, cylindrical ; spire concealed. Sides of whorl smooth ; 

 aperture narrow-, elongate, broadening rather rapidly near the anterior end; 

 margin of outer lip produced rather strongly posteriorly ; single columella!- plate 

 or plication well developed on lower edge of inner lip. 



Dimensions. — Height, 5 mm.; width, 2 mm. 



Occurrence. — University of California locality 1131. 



This species resembles quite closely in outline Cylichna alba 

 (Brown), a Recent West Coast species. It differs in not being so 

 large, the apex is more shrunken and the outer lip more strongly 

 produced posteriorly. The surface of C. alba 159 is covered by fine 

 spiral lines ; apparently the surface of C. ramonensis is smooth. 



158 For original description see Nautilus, vol. 11, no. 2, p. 14, 1897. 



159 For good description and figure of Cylichna alia (Brown), Arnold, see 

 Mem. Calif. Acad. Sci., vol. 3, p. 192, pi. 10, fig. 18, 1903. 



