292 rp:cords of the Australian muskum. 



TURRITELLA OPULENTA, sp. IIOV. 



(Plate liv., fig. 9). 



Shell small, glossy, tall and slender. Whorls ten, two of which 

 form the protoconch. Colour, irregular pale brown marbling on a 

 milk white ground. Sculpture : the upper whorls are strongly 

 bicarinate by two projecting spirals which evenly divide the 

 height of the whorl into quarters. On the lower whorls these 

 keels are less conspicuous. About the eighth whorl a spiral 

 thread is intercalated above, between and below the keels ; these 

 increase witli the whorls, but fail to attain the size of tlie major 

 spirals. Fine close-set radial riblets traverse every adult whorl, 

 above they foi-m a coarse lattice with the carin* ; on the older 

 whorls they merely raise small beads on the keels and inter- 

 mediate threads ; on reaching the base they cease abruptly. Base 

 bounded by a strong smooth spiral, within which are concentric- 

 ally arranged four faintly raised spirals. Along the suture a 

 crack or fissure is interposed between the basal rib of the upper 

 whorl and the beaded thread which forms the summit of the suc- 

 ceeding whorl. Protoconch smooth, globose. Aperture ovate, 

 angled above, effuse below, lip sharp, columella straight, slightly 

 thickened. Length, 6 ; breadth, 2 mm. 



This species appears to be common and generally distributed 

 upon our continental shelf. Besides the present stfition it has 

 occured in 41-50 fathoms off Cape Three Points (type) ; in 250 and 

 300 fathoms off Sydney ; in 50-52 fathoms off Botany Heads ; in 

 55-56 fathoms off Wollongong, and in 63-75 fathoms off Port 

 Kembla. 



The sculpture is subject to considerable variation ; in some 

 examples the spiral sculpture is less, and the radial more promi- 

 nent than in the individual figured. 



Its nearest ally would seem to be Tarritella parva, Angas,' to 

 which in size and shape it neai'ly approximates, but from which 

 its radial sculpture and sub-channeled anterior aperture effectually 

 divides it. 



Vermicularia nodosa, $p. nov. 



(Plate liv., fig. 8). 



Shell small, very solid. Colour gray (? faded). Whorls three, 

 rapidly increasing, coiled adhei-ent to a foreign body, except a 

 third of the last whorl, which is free and semi-erect. Sculpture : 

 thick out-standing radial ribs, about twenty on the last whorl, 



7 Aiigas -Proc. Zool. Soe., 1877, p. 174., pi. xxvi., f. 17. 



