BY C. HEDLEY. 707 



The radula has been illustrated by Maplestone,* from a 

 Williamstown specimen. 



Phenacolepas cinnamomea Could. 

 (Plate xlviii., figs. 17, 18, 19.) 



Patella cinnamomea Gould, Proc. Boston Soc. Nat. Hist., ii., 

 1646, p.l51. Scutellina cinnamomea Brazier, these Proceedings, 

 iv., 1879 ( 1880), p. 389. Phenacolepas cinnamomea Thiele, Conch. 

 Cab. Abth. xi.a, 1909, p. 35, PI. 6, fig. 5. iScutellina ferruginea A. 

 Adams, Gen. Rec. Moll f 1854, PI. 52, figs.6, 6a. 



This species was described originally as a Patella, and was 

 transferred by Adams to Scutellina. Remarking that this name 

 of Gray was preoccupied, Pilsbryf substituted Phenacolepas for 

 it. I have a grave suspicion that Plesiothyreus, Cossmann| pro- 

 posed for a French Tertiary fossil and applied by Sowerby^ to a 

 recent Hong Kong shell, should be employed in its place. 



Important remarks by Dr. Dall,|| referring this group to the 

 vicinity of Nirita, seem to have been overlooked by subsequent 

 writers. 



Dr. Thielell has published some notes on the anatomy of this 

 species. 



P. cinna.momea is rather rare; it occurs in Sydney Harbour 

 under large stones in the mud-zone, in communities of a dozen 

 or so under the same rock. The animal is uniform crimson. 

 The shell is carried with the apex turned to the posterior end. 

 A large, open chamber is exposed behind the head, whence the 

 broad, bipectinate ctenidium may be stretched beyond the shell 

 margin or be withdrawn out of sight. The neck is long and 

 flexible; the muzzle terminates in a bilobed upper lip, projecting 

 as an immense hood over and beyond the small mouth. The 



* Maplestone, INIonth. Micros. Journ., viii., 1872, p. 14, PI. xxvi.. No. 14. 

 tPilsbry, The Nautilus, v., 1891, p.89. 

 IJrCossmann, Ann. Soc. Malac. Belg., xxiii., 1889, p. 191, PI. vii., iif^s. 13-15. 

 §Sowerby, Proc. Malac. Soc, i., 1894, p. 191. 

 IIDall, Bull. Mus. Comp. Zool., xviii., 1889, p. 342. 

 U Thiele, Zeits. wiss. Zool., Ixxii., 1902, p.349, PI. xxvi., figs. 133-134, 

 text-fig. 11. 



