V< I I'll 



'IMT anteriorly ; these j ' :-\sli:it /IL'/HI: b\ ex i'_ r ' i 



roWtb, but are nol pun n Ml many -pecie- ; other .-pir:d 



sculpture coiisistiiiL: f microscopical! v fine .-li-jlitly /i'_r/.;i'_: - 

 about M'vrnly in tin- width of a millimeter; transverse sculpt im- 

 only of most delicate llexuous lines of growth most evident marine 

 sutures: apt-rum- rounde. 1 in front, pointed In-hind; outer lip thin, 

 simple, arcuated toward the periphery, pa inir imp* T< < -ptiUy into 

 tin- pillar; body with a slight callus joining the rather slender 

 pillar which carries one inconspicuous fold. Ln. of shell, '' 

 laM whorl, 7*0; of aperture, 5'75. Max. hit. of >hell, 

 aperture, 3'0 mill. (Dall). 



Yucatan St., off < .l///o///'o, t;in fm.-. 



A. indsus BALL, Bull. M. ( 1 . 7.. ix, p. 95; Blake Rep. Gastr., p. 

 42, pi. 17, f. 1,16. 



In this, as in the preceding deep-water species, the fold or i id_r< 

 on the columella is faint, though not entirely absent, and is 

 seen from the side; in fact, it is almost invisible in all, except A. 

 melampoides, from in front as the figures are vie wed. The columella 

 in these figures, however, is drawn as straighter and broader than it 

 really appears; but in these particulars it is very difficult to get a 

 draughtsman who knows nothing of shells to catch the characteri>ti< 

 curves in every instance. (Dall). 



A. EXIGUUS (Dunker) Morch. Unfigured. 



Shell covered-perforate, flesh colored, ovate ; spire elevated, nearly 

 half the length of the shell; last whorl with its lower half sulcate, 

 the bottoms of the grooves punctate; spire and upper half of the 

 body-whorl smooth; suture subcontabulate, margined by an im- 

 pressed line; columellar fold strong. 



Length 6J, diam. 3 mill. (Morch). 



.1 ''x(Riise). 



Actceon exiguus DKR. mas. Moi:< n, Malak. Blatter, xxii, p. 169, 

 1875. 



Var. ovalis Morch. Spire shorter, suture margined with two deep 

 grooves. Alt. 6, diam. 8'1 mill. 



A. SPLENDIDULUS Morch. Unfigured. 



Shell elongate-ovate, very solid, whitish, bright and shining. 

 Whorls about 5, the last with impressed spiral lines, punctate along 

 their bottoms, very distant in the middle of the la>t whorl, hut to- 

 ward the base becoming closer and in pairs. Sutural region smooth. 



