154 GAZA. 



testse adequans ; columella tenui, alba, arctissime perforata ; labro 

 acuto, pallido, intus rufo submarginato. 



Axis 12, diam. 6 mill. (Gould.} 



GOULD, in Proc. Bost. Soc. K H. viii, 1861, p. 18. 



Sydney, N. S. W. 



Genus GAZA, Watson, 1878. 



Gaza WATSON, Journ. Linn. Soc. Lond., xiv, p. 601 ; Report on 

 Challenger Gasteropoda, p. 93. DALL, Rep. on ' Blake ' Gastero- 

 poda, p. 354. 



The animal of G. superba has been described by Dr. Dall as 

 follows : 



An examination of the soft parts showed the operculum to be 

 very thin, light brown, and with about seven whorls. The animal 

 was of a whitish color without any spots or markings, and with 

 very large black eyes set on a good-sized peduncle closely adjacent 

 to and behind the tentacles. There is a single narrow gill in the 

 usual position. The tentacles are long, large, and rather slender ; 

 the foot short, broad, and bluntly rounded in front, behind almost 

 truncate, in fact the contracted specimen looked almost as if there 

 was a broad posterior indentation in the middle line. The muzzle 

 is long, narrow, subcylindrical above and transversely expanded at 

 its distal end, which is semi-lunar with a densely papillose surface 

 and fringed edges. This expansion is nearly three times as wide 

 as the stem of the muzzle. Epi podium with a large lobe behind the 

 eye peduncle but not connected with it ; behind the lobe is one long 

 process and then a shorter one. The frill behind is merely puckered, 

 but from under the borders of the operculum on each side protrude 

 three good-sized processes. Behind the opercular lobe the epipo- 

 dium terminates in a prominent point, concave and papillose on its 

 upper surface. There are no frontal lobes between the teiitacula. 

 The epipodial point extends some distance behind the posterior end 

 of the foot. The jaw is like that of Calliostoma in shape, composed 

 of brown four-sided translucent prismatic rodlets which give under 

 the microscope a reticular marking of diamond-shaped spots to the 

 .surface of the jaw; the two sides are not united in the middle line. 

 The dentition closely resembles that of Lunella versicolor Gmelin 

 as figured by Troschel (Geb. der Schnecken, ii, pi. 20, fig. 7), ex- 

 cept that the bases of the rhachidian and lateral teeth are subcir- 

 cular, and on a few of the scythe shaped cusps of the numerous 



