[TAYLOR] MARINE MOLLUSCA 93 



333. ToNicELLA MARMOREA, O. Fabi'icius, sp. 

 Chiton viarmoreus, O. Fab., Fauna Groenl.. p. 420 (1780). 



This is a species that I have searched for, so far, in vain. So far as 

 I know it has only been taken in the Pacific Ocean, near the Aleutian 

 Islands (Dall), and at Japan, and by Dr. Dawson in Houston-Stewart 

 Channel, Queen Charlotte Islands (two specimens). 



It is a common si)ecies on both sides of the Atlantic Ocean. 



CYANOPLAX, Pilsbry. 



334. Cyanoplax Hartweqii, Carj)enter, sp. 

 Chito7i Hartwegii, Cpr., Proc. Zool. Soc. London, 1855, p. 231. 



335. Cyanoplax JSTuttallii, Carpenter, sp. 



Chiton Nuttallii, Cpr., Proc. Zool. Soc. London, 1855, p. 231. 



C. JVuttallii is recorded from Paget Sound (Swan), and C. Hartwegii 

 is said to have been found at the Queen Charlotte Islands by Dr. Daw- 

 son. Dr. Pilsbry supposes the two to be forms of one species. My 

 own specimens of C. Hartwegii (I have not met with the other form) 

 are from Victoria, but they are not any of them quite like the tj^jical 

 Californian ones.^ 



ISCHNOCHITON, Gray. 



336. ISCHNOCHITON INTERSTINCTUS, Gould, Sp. 



Chiton inter stinctus, Gould, U. S. Expl. Exped., Mollusca, p. 322, pi. xxvii., 

 figs. 423-423b (1852). 



This beautiful little species is very common on stones and dead 

 shells dredged in ten to thirty fathoms, at Victoria, Departure Bay and 

 elsewhere. Dr. Dawson obtained it in Vii-ago Sound and Houston- 

 Stewart Channel, Queen Charlotte Islands, and in many more southerly 

 localities. Occasionally small specimens may be found under stones 

 between tides. 



33*7. IscHNOCHiTON RETEPORosus, Carpenter, sp. 



Ti^achydermon retiporosus, Cpr., Kept. Brit. Assoc, 1863, p. 649 (August, 1864) ; and 



Proc. Acad. Nat. Sci. Phila., 1865, p. 59. 

 = Leptochiton punctatus, Whiteaves, Trans. ,Roy. Soc. Can., vol. iv., sect, iv., 



p. 125, figs. 3 and 4 (1886). 



This is usually found in company with the last s^Decies and is 



1 Since the above was written, Dr. Pilsbry has described this form, which occurs 

 also in California, as a distinct species under the name Trachydermon (Cyanoplax) 

 Raymondi. Nautilus, vol. viii., p. 46 (August, 1894). 



