EXPLANATION OF PLATE X. 
Varieties of Turbinella pirum (Linn.). 
Variety acuta. 
Fic. 1.—Tuticorin race. Seven specimens showing range in form. x }. 
„  2.—Kilakarai and Ceylon Pearl Banks race. The seven upper figures are fr 
Kalikarai, the three at bottom are from the Ceylon Pearl Banks O 
Marichchikadde and Dutch Bay. x +. 
,,  3-—Rameswaram race. Six specimens. x L. 
,,  4.—North Vedalai race. Eleven specimens. x £. 
; Variety obtusa. | pet 
Fic. 5.—Tirupalagudi race, showing range in form. Compare with the shells | 
à : | North Vedalai (fig. 4) which march with this race of obtusa. x E : 
,, 6.—Coromandel race. Specimens from off the coast of the Tanjore District. 
x 4: | 
