296 KliCOKDS OF THE AUSTRALIAN MUSEUM. 



keel which determines an angle in the contour of the shell. Half 

 way between the major keel and the suture runs a smaller keel. 

 On the last whorl there are about fourteen spirals, gradually 

 diminishing anteriorly, below the major keel. The fasciole is 

 ornamented by spaced, delicate, concave riblets. Fine arcuate 

 growth lines appear in the interstices of the spiral keels. In the 

 protoconch, the first wliorl and a half are small, rounded, and 

 spirally striate ; the rest protrude medially, and are crossed by fine 

 sharp radial riblets, which on the last whorl number twenty-tv/o. 

 Their interstices are latticed by spiral threads. 



One example of which the aperture is defective. Length, 5 mm.; 

 breadth, 1 -9 mm. 



The figures of Jlaiu/ilia comatotropis, Dall,^'' present consider- 

 able analogy to our species, but appear to be nai'rower, with fewer 

 bolder spirals. 



If the characters be analysed foi- generic disposal in the per- 

 plexing maze of the Pleurotomida?, the most prominent features 

 resolve in the elaborately sculptured protoconch, and the broad 

 sub-sutural fasciole, indicative of a deep sinus. These features 

 are repeated, though associated with difl^erent form and sculpture, 

 by my Pleurotoma veiivatica}'' 



Verrill's PletirotomeUa,-^ while not exactly conforming to the 

 requirement appears to come nearest, and is therefore here 

 employed. 



MaNGELIA LUTARIA, Sp. 710V. 



(Plate liv., figs. 11, 12). 



Shell small, solid, cylindrical, abruptly truncate above. Whorls 

 five, three forming the protoconch, sloping on the shoulder, per- 

 pendicular at the side, and concave at the base. Colour grey 

 (? bleached). Sculpture : deep narrow pits are formed by the in- 

 tersection of radial and spiral sculpture ; i-adials strong, prominent, 

 perpendicular, continuous ribs, about a dozen to a whorl, knotted 

 at the crossing of the spirals, which number four on the upper and 

 twelve on the lower whorl, the spiral defining the basal angle 

 larger and more prominent. Protoconch : first whorl wound 

 oblique to the axis of the main sliell, the second overhanging the 

 third, appearing as if the apex was wrapped in a turban. Aper- 



^^ Fischer and Daiitzenberg — Mem. Soc. Zool. Fr., ix., 1896, p. 419, pi. 



xvii., f. 15. 

 " Hedley- Mem. Austr. Mus., iv., 6, 1903, p. 384, f. 97. 

 1^ Verrill-— Am. Journ. Sci. (8), v. 1872, p. 15 ; Cossmann — Essais de 



Paleconchologie comparee, ii., 1896, p. 133. 



