34 Prof. F. M'Coy on a new Volute. 



Fig. 9. Larva, fifth stage ; the dorsal vessel and the flexible setse have 



made their appearance. 

 Fig. 10. Larva, sixth stage : the three original pairs of larval feet have lost 



the setse ; the others are furnished with two sorts of setse. Nat. 



length 5 millims. 

 Fig. 11. Larva, seventh stage, in which the upper pair of antennae are 



more developed. Nat. length 10 millims. The tube is repre- 

 sented in the act of emerging. 

 Fig. 12. Eye of larva in sixth stage : «, swelling of the cephalic ganglion ; 



h, gangliary layer of the retina ; c, choroid ; J, crystalline ; 



e, sclerotic. 

 Fig. 13. Fragment of the choroid. 

 Fig. 14. Foot of larva in the sixth and seventh stages : a, dorsal cirrus ; 



5, abdominal cirrus ; c, foot proper ; d, dorsal tubercle. 

 Fig. 15, Setae : a, the larger spinulous ones ; 5, the simple flexible ones. 



III. — On a neio Volute. By Fredeeick M'Coy, Professor 

 of Natural Science in the University of Melbourne. 



[Plate m. figs. 1 & 2. J 



Vohita (Amorta) canaliculata (M'Coy). 



Sp. Ch. Elongate-ovate ; spire short, of 4^ whorls, distinctly 

 channelled at the suture ; pillar with four strong, subequal, 

 oblique plaits, the most posterior continued into ridge of 

 anterior thickened belt. Colour whitish (faded specimen), 

 with, on body-whorl, five spiral rows of longitudinally 

 elongate-oblong tawny spots, one row at the suture. Total 

 length 1 inch 8^ lines, proportional length of aperture -riro} 

 greatest width -^■^. 



This Volute differs from the V. {Amoria) maculata, which 

 it most nearly resembles in shape and colouring, by the spots 

 being more numerous and shorter, by the plaits of the pillar 

 being oblique, by the width being greater and the greatest 

 width being nearer the suture, and by the suture being dis- 

 tinctly canaliculated. 



I obtained the only specimen I have seen of this species, 

 for the National Museum at Melbourne, from Mr. R. Thatcher, 

 who had observed the fact of its being specifically distinct 

 from the V. (A.) maculata. 



Locality. Port Denison. 



EXPLANATION OF PLATE III. 



Figs. 1 & 2. Volula canaliculata, back and front views, natural size. 



