191 Dominican Fossii,s — Maury 27 



Terebra gausapata variety Icevifasciola, n. var. 

 Plate 3, Figure 19 



Shell small, very slender and elongate, resembling T. gausa- 

 pata Brown and Pilsbry from Gatun (Proc. Acad. Nat. Sci. 

 Phila., pp. 340-341, pi. 22, figs. 8, 9, 191 1) and is probably a va- 

 ciety of that species. The specimens of T. gausapata were frag- 

 mentary, but they show the strikingly deep sulcus beneath the 

 subsutural fasciole which is very marked in the Dominican shell. 

 Jn gausapata, however, this fasciole is ornamented with three 

 spirals, while in our shell it is smooth. This has suggested the 

 varietal name. Our shell has sixteen whorls, separated by a 

 wavy suture; each whorl is sculptured by about fifteen longitudi- 

 nal riblets which are very strongly developed on the subsutural 

 band, but on crossing the deep sulcus are low and diminished to 

 half their thickness, they then continue over the remainder of the 

 whorl in a slightly oblique direction. The anterior portion of 

 each whorl is ornamented by about seven spiral threads which 

 do not cross the riblets; columella with two sharp folds. Length 

 of shell 18, greatest diameter 3.5 mm. Rare. 



The biplicate columella and the deep sulcus beneath the sub- 

 sutural band show the close relationship of this shell to the T. 

 bipartita group. 



Locality. — (Exp'd '16) Bluff 3, Cercado de Mao. 



Terebra Cambiarsoz, n. sp. 

 Plate 3, Figure 20 



Shell small, acute, whorls about eleven, all except the nu- 

 clear being ornamented with narrow, longitudinal riblets; sub- 

 sutural band distinct, marked off by a narrow, deep sulcus, the 

 portion of the whorl anterior to this sulcus sculptured with two 

 sharply incised spiral lines which do not cross over the longitu- 

 dinal riblets. Columella with two distinct plications. Length of 

 shell 14, greatest width 4 mm. Rare. 



In its size and in the scarcity of spiral lines sculpturing the 



