EEPORT ON THE POLYPLACOPHORA. 31 



Section II.— CHITONES IRREGULARES. Irregular Chitons. 



Tail plate abnormal, or with a sinus behind. 



E. — SCHIZOIDEA. 



Genus Lorica, H. and A. Adams. 

 Lorica volvox (Reeve). 



Chiton volvox, Reeve, Conch. Icon., 1847, pi. vi. fig. 31. 



„ cimolius, Reeve, Conch. Icon., 1847, pi. xxi. fig. 141. 

 Lorica cimolia, Adams, Gen. Recent. Moll., 1858, vol. i. p. 477, vol. iii. pL liv. fig. 5. 



„ „ Angas, Proc. Zool. Soc. Lond., 1867, p. 224. 



Habitat. — Port Jackson, Sydney. 6 to 15 fathoms. 



Mr Angas first united these two species, but retained the name for the second form 

 instead of for the one first described. It is a very well-marked species, of large size. 



Other localities are Watson's Bay ; Middle Harbour ; Port Lincoln, South Australia and 

 Tasmania. 



Genus Schizochiton, Gray. 

 Schizochiton incisus (Sowerby). 



Chiton incisus, Sowerby, Proc. Zool. Soc. Lond., 1841, p. 61. 

 ,, ,, Reeve, Conch. Icon., 1847, pi. viii. fig. 43. 



,, elongatus, Reeve, Conch. Icon., 1847, pi. viii. fig. 40 a and b. 

 Schizochiton incisus, Gray, Proc. Zool. Soc. Lond., 1847, p. 169, and Guide to Moll., 1857, p. 183; 

 Shuttleworth., Bern. Mittheil., 1853, p. 68 ; H. and A. Adams, Genera Recent 

 Moll., 1858, vol. i. p. 477, vol. iii. pi. liv. figs. 6, 6a; E. A. Smith, Voyage 

 " Alert," 1884, p. 82. 



Habitat. — Samboangan, Philippines. Three specimens. 



Island of Zebu, Philippines (Cuming) ; Raine Island, Torres Strait (Ince) ; Claire- 

 mont and Bird Islands, North-East Australia (Coppinger). 



Mr Smith has adopted the somewhat obvious suggestion of Carpenter [fide a tablet in 

 the British Museum), that Schizochiton incisus and Schizochiton elongatus are forms of 

 the same species. He has also given a short description of Dr Coppinger's specimens. 

 The most remarkable feature of this species is the possession of a series of well-developed 

 eyes along the ridges of the shell, for such the " minute blackish beads " have been demon- 

 strated to be by Professor Moseley, 1 in whose paper will be found an account of the struc- 

 ture of these remarkably situated organs and of the branching papillae (Megalaesthetes 

 and Micrsesthetes) which occur in the shells of other species of Chitons. 



1 Quart. Journ. Micr. Sci., N. S., 1885, vol. xxv. p. 37. 



