532 GASTROPODA. [Opisthobranchia. 



Diameter. 1-3 mm. ; height, 2-5 mm. (type). Diameter. 1-9 mm. ; 

 height. 3-8 mm. (Whangaroa specimen). 



Animal unknown. 



Type in the Dominion Museum, Wellington. 



Hob. Whangaroa Harbour (C. Traill) ; dredged in Rangitoto 

 Channel (T. F. Cheeseman) ; Foveaux Strait, in 15 fathoms ; Port 

 Pegasus, Stewart Island, in 18 fathoms ; near the Snares, in 50 fathoms 

 (Captain Bollons) ; ten miles north of Enderby Island, Auckland 

 Islands, in 85 fathoms (E. R. Waite). 



Fossil in the Miocene and Pliocene. 



3. Cylichnella Thetidis, Hedley, 1903. Plate 23, fig. 5. 



Cylichna Thetidis, Hedley, Mem. A.M., iv, pt. 6, 1903, 395, fig. Ill in text ; 

 Murdoch and Suter, f .N.Z.I., xxxviii, 279. ? C. zealandica. T. W. Kirk, 

 T.N.Z.I., xii, 307. C. striata, Hutton : Pilsbry. Man. Conch. (1), xv, 

 319, pi. 59, f. 11, 12 ; not of Hutton. 



Shell rather large, narrow, elongated, cylindrical, thin, and glossy. 

 Sculpture : Growth-lines hardly perceptible, encircled by fine close 

 incised lines ; almost effaced medially, and wider-spaced above. 

 Colour white. The crown concave, with a narrow axial perforation, 

 partly roofed by a callous arch. Aperture as long as the shell, narrow 

 above, expanded and effuse below ; lined on the inner side by a sheet 

 of callus ragged at the edge. Columella oblique, slightly twisted, 

 thickened, with a slight angle at the junction with the convex lower 

 part of the parietal wall. Inner lip narrow, with a furrow on the 

 outside, spreading thinly over the parietal wall. 



Diameter. 4-5 mm. ; height. 11 -5 mm. (type). 



Animal unknown. 



Type in the Australian Museum, Sydney. 



Hab. Off Great Barrier Island, in 110 fathoms ; Auckland Harbour 

 (G. W. Wright) ; near Cuvier Island, in 37 fathoms (Captain Bollons) ; 

 near Channel Island, Hauraki Gulf, in 25 fathoms ; Foveaux Strait, 

 in 15 fathoms. The type is from off Manning River, Australia, 22 

 fathoms. 



Remarks. This species has evidently been taken for M. arachis, 

 Q. & G., which does not occur in New Zealand waters. The type of 

 C. zealandica, Kirk, has been lost ; it was not figured, and the short 

 diagnosis is applicable to quite a number of species. It was found at 

 Waikanae. 



Fam. BULLARIID<E, Dall. 



Bull idee, Pilsbry. 



Animal capable of complete retraction into the shell, with a large 

 head-disc, truncated in front, bilobed behind, bearing eyes about 

 in the middle. No epipodial or parapodial lobes ; foot long, tapering 



