246 MELAMPINiE. 



This genus, the outer lip of which is internally without 

 transverse ribs or plaits, is found only in Australia and 

 New Zealand. 



Genus LAIMODONTA, Nuttall. 



Shell oblong-ovate, imperforate, thin, transversely striated; 

 spire elevated, conic ; aperture oval ; inner lip with three 

 plaits, the anterior small ; outer lip with the margin acute, 

 posteriorly sinuated, internally with an elevated, transverse 

 ridge. 



Ex. L. Sandwichensis, Eydoux and Souleyet, pi. 83, 

 fig. 1. Shell, L. Sandwichensis, fig. 1, a. 



The groups of Islands in the Pacific harbour the species 

 of this genus, which may be known from Ophicardelus by 

 the internal, elevated rib of the outer lip. 



Species of Laimodonta. 



Layardi, H. and A. Adams. sulcata, H. and A. Adams. 



Quoyi, H. and A. Adams. taeniata, Nutt. 



Sandwichensis, Eyd. and Soul. 



Genus MARINULA, King. 



Foot simple inferiorly, without a transverse groove. 



Shell ovate-oblong, imperforate, solid, smooth ; spire 

 short, acute ; aperture obovate ; inner lip broad, excavated, 

 with three plaits, the posterior the largest ; outer lip pos- 

 teriorly sinuated, internally simple, the margin acute. 



Ex. M. eequalis, Lowe, pi. 83, fig. 2. Shell, M. pepita, 

 King, fig. 2, a. 



The species of this genus inhabit salt water, Captain 

 King having found them on wooden piles below the wash of 



