36 Gatliff and Gabriel: Neiv Marine Shell. 



400 embryonic shells, most of which are shown in Figure 3. 

 Upon another occasion an almost entire, empty shell was 

 dredged, and at other times a half-grown specimen and portions 

 of the shell have been similarly obtained. 



Judging from the description and figure (we have not seen 

 the type) the main points of difference in our shell when com- 

 pared with the typical Larina are : ours is umbilicate and 

 the peristome is continuous ; and in consequence of these differ- 

 ences we have only placed it provisionally in the genus. 



A very incomplete half-grown specimen has been sent to us by 

 Miss Lodder, Tasmania ; it Avas found by her years ago on the 

 North Coast. 



Mr. E. A. Smith remarks^ : '" The genus Larina supposed by 

 Adams to be marine ; it has, however, very close relationship to 

 Vivipara on account of similarity of the opercula, and it is 

 undoubtedly a fresh-water form, as is clearly shown in the 

 British Museum specimen obtained in McKenzie River by the 

 Port Essington Expedition during the year 1845." The ques- 

 tion arises. Was it obtained at a portion of the river beyond 

 tidal influence ? Our specimens were dredged in the sea fully a 

 mile from the shore, and there are no running streaujs in the 

 vicinity. 



We are indebted to Mr. F. Chapman, of the National Museum, 

 Melbourne, for his skilful w^ork in photographing the specimens. 



Type in Mr. C. J. Gabriers collection, 



EXPLANATION OF PLATE XIIL 



LaKIXA (?) TLRBINATA, Sp. UOV. 



Fig. L — Position of body whorl of emlnyonic form. 



Fig. 2.— Radula of type. 



Fig. 3. — Group of embryonic forms. 



Fig. 4. — Embryonic forms. 



Fig. 5.— Dorsal aspect of type. 



Fig. 6. — Front aspect of type. 



Fig. 7. — Basal aspect of type. 



All of the flgures vai'iously magnifled. 



1 Jour. liiiiii. Soc. [>oiid., ISSI, \ol. \vi., p. -iGO. 



