BY H. LEIGHTON KESTEVEN. 465 



LOTORIUM PHILOMEL.E, Watson, Sp. 



Trito7i (Simpuhnn) philomelce, Watson, ChalL Rep. Zool. xv., 1885, 

 p. 391, pi. xiv., f. 10. 



" Apex consists of four polished but spirally threaded, white, 

 turbinated whorls, of which the first is extremely small and some- 

 what immersed." 



LOTORIUM PHARCIDUM, Dall, Sp. 



Lampusia pharcida, Dall, "Blake Mollusca," pt. ii., p. 227, 

 pl.xxxvi., f. 1. 



" A four-whorled subcylindrical nucleus; nucleus smooth with 

 rounded subequal whorls and a rather blunt apex." This pro- 

 toconch somewhat resembles that of L. vespaceum, but is not so 

 tapering. 



Fossil Species. 



One of the most noticeable features of these fossils was the 

 large number of specimens which had their apices complete (over 

 70 per cent.). Among recent species I had, like Mr. Baker (3), 

 found that only about five per cent, retained their apices. Talking 

 over this matter with Mr. C. Hedle}', he suggested that it was in a 

 great measure due to their having been inhabitants of deep and 

 still waters. Though the greater strength of the fossil apices has 

 doubtless been a contributing cause, an inquiry into the habitats 

 of living allies has provided support for Mr. Hedley's sugges- 

 tion. He has (17) in dealing with tlie "Thetis" Pelecypoda 

 instanced several cases of fossil species or their near allies occurring 

 off the coast of New South Wales in deep water. My own investi- 

 gations have disclosed the fact that many of the shells collected 

 by the "Challenger" in deep waters of high southern latitudes 

 have near allies in the fossil beds from which the species under 

 discussion were obtained. It is thus seen that many of the 

 nearest living allies of these fossils are inhabitants of deep waters, 

 and it might reasonably be inferred that they themselves occupied 

 similiar localities. This inference cannot, however, safely be 



