EXPLANATION OF PLATE. 



PLATE XX-MOLLUSCA. 



Figs. 1, 2.-PLEUR0T0MA (SURCULA) THISBE, E. A. Smith. 

 Pleurotoma thisbe, E. A. Smith, Ann. Mag. Nat. Hist. (7), Vol. 

 XVIII, p. 162 (1906). 



Figs. 3, 4.-PLEUR0T0MA CARINATA, Gray. 

 Pleurotoma carinata, Gray, E. A. Smith, Ann. Mag. Nat. Hist. (6), 

 Vol. XXIII, p. 368 (1896), and (7), Vol. XVIII, p. 160(1906), 



Figs. 5, 6.— ANCILLA ALCOCKII, E. A. Smith. 

 Ancilla alcockii, E. A. Smith, Ann. Mag. Nat. Hist. (7), Vol. 

 XVIII, p. 172 (1906). 



Figs. 7, S.-VRSICOMYA BREVIS, H. A. Smith. 

 Vesicomya brevis, E. A. Smith} op. tit , p. 261. 



