1914] 



English: Agasoma-Uke Gastropods 



247 



irregular lines of growth, but no indication of any spiral ornamenta- 

 tion. In this respect it is unlike the other species assigned to the genus 

 Ficus, to which genus it is somewhat doubtfully referred. 



Height 85 mm., width 55 or 60 mm. ; mouth-opening length 85 mm. ; 

 width 38 mm. 



Only one specimen has been found. It came from the Scutella 

 breiveriana zone at the top of the Monterey group on San Pablo Bay 

 (U. C. Loc. 1176). 



TKOPHOSYCON NODIFERUM (Gabb) 

 Plate 25, figures 2 and 4 

 Ficus nodiferus Gabb, Palae. Calif., vol. 2, p. 48, pi. 14, fig. 5, 1869. 



Shell pear-shaped, with large body -whorl ; spire low ; body-whorl 

 forming two-thirds width of spire ; an upper and lower angulation 

 of shell, the former the more distinct; shell ornamented by spiral 

 rows of about twelve vertically elongated nodes along the lines 

 of angulation of body-whorl, the lower nodes generally below the 

 interspaces of the upper row ; nodes much less prominent on early 

 whorls ; both upper and lower nodes are vertically elongated and have 

 from one to four, generally two or three, sharp cusps, which are 

 formed where the heavier spiral lines cross the raised area of the 

 node ; shell marked by spiral lines between which are three finer lines 

 of which the middle one is the wider; spiral lines are crossed by 

 numerous very fine longitudinal lines; mouth-opening elliptical; outer 

 lip simple ; columella with prominent callus which shows above suture ; 

 canal medium length, wide, shallow, recurved. 



This species is similar to T. kernianum Cooper, from the Temblor 

 formation of the San Joaquin Valley, but T. nodiferum shows the 

 following differences : larger size, the maximum lengths being 120 mm. 

 and 60 mm., respectively; slightly lower spire and larger apical angle; 

 the spiral lines on T. nodiferum are coarser and show a tendency to 

 be wavy ; the nodes are vertically much more elongated and generally 

 have from two to three cusps, instead of only one, or rarely two ; in 

 in the mature specimens the cusps are more acutely pointed on 

 T. nodiferum. 



Immature specimens, and the earlier whorls of mature ones, have 

 the nodes small or lacking, and an oval outline replaces the normal 

 angulation of the body-whorl. These specimens resemble Ficus pyri- 

 formis in outline, though the ribbing is somewhat different. As the 



