MUSEUM OF COMPARATIVE ZOOLOGY. 143 



backward and the anterior pair is not prolonged over the pillar outside the 

 aperture. Tliey have been compared with (mould's original type. The lat- 

 ter is quite pyrilorni, the shell being widest near the posterior third. The 

 V. hadria is more stumpy though still a little pyrilorm, and has a remarkably 

 thick outer lip. Lon. 2.0; lat. 1.50 mm. 



Volutella (lacrimiila var. ?) amianta Dall. 



Habitat. Off the coast of North Carolina, in 14 to 52 fms., sand, U. S. Fish 

 Commission. 



Shell more cylindrical, sides more parallel, longer, narrower, thinner, plaits 

 Bubequal, all small and confined to the aperture, which is narrower. The 

 greatest diameter is about in the middle. The callus where the outer lip 

 rounds over the spire is not prominent. Lon. 2.75; lat. 1.75 mm. 



The above all have four plaits. V. ovuliformis Orbigny, from the Antilles, 

 has a much narrower aperture and only three plaits. 



V. agger Watson, from Culebra Island, in 390 fms., Challenger Expedition, 

 is somewhat peculiarly produced behind in the young state, and does not agree 

 exactly with any of the preceding forms. 



Subgenus PERSICULA Schumacher. 

 Persicula catenata Montagu. 



Marginella catenata Montagu, Brit. Test., p. 236, (Suppl, p. 104,) pi. vi. fig. 2, 1803. 



Redfield, Cat. Marg., p. 227, 1870. 

 Marginella alba C. B. Adams (worn), Contr. Conch., p. 56, 1850. 



Habitat. Off Grenada, Station 262, in 92 fms. 



Two dead and worn hermit-crab specimens were found as above, and referred 

 to this species. 



Section? GIBBERULA Swainson. 

 Gibberula minuta Pfeiffer. 



Marginella minuta Pfr., Arch, fiir Naturg., I. p. 259, 1840. 



Marginella Lavalleana Orbigny, Moll. Cuba, II. p. 101, pi. xx. figs. 36-38, 1845. Red- 

 field, Cat. Marg., p. 240, 1871. 



Marginella minima Shy., Thes. Conch., I. p. 388, pi. Ixxviii. fig. 220, 1846 ; not of 

 Guilding. 



Habitat. Barbados, 100 fms., one fresh specimen. 



It is probable that this little shell will be found to inhabit the Mediterra- 

 nean, the southeast coast of the United States, and the coast of California, as 

 well as the West Indies. The specimens from these three regions seem to be 

 identical, but more material should be compared before making a final decision. 



