273 Dominican FossiivS — Maury 109 



cles on its margin and far within, beyond the groove correspond- 

 ing to the varix, another row of seven smaller denticles. Inner 

 lip strongly and closely wrinkled its entire length, upper (poster- 

 ior) canal produced into a spout-like gutter, those of the last 

 three whorls persisting on opposite sides of the varices; lower 

 canal short, reflexed. Length 37, width 24 mm. 



This shell resembles the recent, larger Oriental B. bufonia 

 Lamarck in the characters of the aperture; abrupt reflexion of the 

 anterior canal and spout-like extension of the posterior canal. The 

 latter feature separates it from B. Thomcz d'Orbigny. 



Locality. — (Exp'd '16) Zones B and D, Rio Gurabo at Los 

 Quemados. 



Bursa Amphitrites, n. sp, 

 Plate 17, Figure 9 



Shell with two varices to each whorl, the varices markedly 

 discontinuous, Triton -like, resembling those of B. scrobiculator, 

 rounded, their sculpture conforming to the spiral structure of the 

 whorls; intervarical tubercles seven to nine, small, rounded; 

 whorls seven and a half convex, not flattened dorso - ventrally as 

 in B. bufoniopsis, the first two and a half volutions are smooth, 

 nuclear, the third is decorated with two rows of minute tubercles 

 after which the beaded spiral threads appear. The spiral sculp- 

 ture of the last whorl consists of a row of bead-like nodules be- 

 neath the suture followed by a very fine beaded spiral thread, a 

 row of smaller nodules, a fine beaded thread, a row of nine rather 

 small, rounded, intervarical tubercles, followed by five nodular 

 spirals each alternating with a fine beaded thread. Aperture 

 oval; outer lip fluted, reflexed anteriorly, bearing within about 

 ten strong lirse some of which are double; inner lip extremely ru- 

 gose, wrinkled its entire length ; upper (posterior) canal U-shaped, 

 apparently not much produced; anterior canal slightly reflexed. 

 Length 46, greatest width 27 mm. 



This handsome species resembles the recent B. affinis Brod- 

 erip, but -differs in the discontinuous varices; the nearly straight 

 columella; and more numerous intervarical tubercles. 



