RETUSA. 20T 



pear-shaped below; lip visibly flexuous, inflected in the middle; 

 columellar margin nearly straight. Columella a little thickened, 

 arcuate, without apparent fold. Color transparent white. Alt. 2'5, 

 diam. 1 mill. (B., D. & D.). 

 Mediierranean and Adriatic Seas; Atlantic from Norivay to the 



Canaries, laminarian zone. 



Bulla mammillata Phil., Enum. Moll. Sicil. i, p. 122. pi. 7,f. 20; 

 ii, p. 96. — Cylichna mamillata Forbes & Hanley, Hist. Brit. Moll, 

 iii, p. 514, pi. 114c, f. 4, 5. — Utriculus mamillatns J effb.., Brit. 

 Conch., iv, p. 420; v, p. 223, pi. 94, f. 1. — Retusa mamillata BuQ., 

 Dautz. & DoLLF., Moll. Rouss., p. 531, pi. 64, f. 1^-10.— Bulla 

 minuta Macgill., teste JefFr. 



Distinguished by the projecting apex and cylindrical form. 

 Except in lacking a columellar fold, this species resembles Torna- 

 tina. 



R. MARiEi Dautzenberg. PI. 24, figs. 34, 35, 36. 



Shell 1 mill, high, 2 mill, wide, minute, subsolid, convoluted,, 

 cylindrical, longitudinally arcuately striated, truncate above, con- 

 tracted iu the middle, dilated toward the base. Whorls 3-4, the 

 penultimate obliquely projecting above the last. Suture little im- 

 pressed. Aperture as long as the shell, straight and a little thick 

 ened ; lip simple, sinuous, inflexed in the middle, ex})anded ante- 

 riorly. Color milky, with a subhyaline zone at the middle (Da^itz.). 



iSan Miguel, Azores. 



Tornatina mariei Dautz., Contrib. a la Faune Malac. des lies 

 Acores, Res. Camp. Sci., Albert I, p. 21, pi. 1, figs. oa-3d, 1889. 



This interesting species seems distinct from all others of European 

 seas, being well characterized by the formation of the summit. In 

 T. mamillata Phil., only the first whorl of the sj)ire projects; in T. 

 mariei this whorl is impressed, and the next-to-the-last whorl is 

 prominent (^Dautz.). 



R. oLiviFORMis Watson. PI. 25, fig. 50. 



This large and very interesting species is in too bad condition for 

 satisfactory description. I had called it Utriculus olivijormis from 

 its shape, which is peculiarly stumpy, with an excessively short and 

 broad mouth, and an unusually high and blunt spire; it is sharply 

 fretted all over with spiral lines, and has a strong, little furrow be- 

 hind the sharp-edged twisted pillar. It is like Utriculus mlcitella 

 Gould, or Utriculus lactnca Nevill, in its conical spire, and like 



