154 



Lepidopledrus alveolus, M. Sars. 



Chiton alveolus (M. Sars, M.S.) Loven (1846). 

 Lepidopleurus alveolus. G. O. Sars (1878). 

 Leptochiton alveolus, Dall (1878). 



" Gulf of St. Lawrence, in 220 fathoms, between Cap des Rosiers and the 

 S.W. point of Anticosti Island, Whiteaves " (Dall). One specimen. 



Hanleyia mendicaria (Mighels and Adams). 



Chiton mendicarius, Mighels and Adams (1842). 

 Hanleyiet, mendicaria, Dall (1878) 



Grand Manan, " 35 fathoms in the Hake Bay, a few fine specimens of this 

 rare species " (Stimpson). Le Have Bank, Nova Scotia, 60 fathoms, coarse 

 gravel, sand and sponges, U. S. Fish Commission, 1872 (Smith and Harger). 



Family Ischnochitonidce. 



ToNiCELLA MARMOREA (Fabricius). 



Chiton rn/irriwreus, O. Fabricius (1780). 



Chiton fidminatas, Couthouy (1838). 



Tonicella marrnnrea, Carpenter (1873); and Dall (1878). 



Common in the Bay of Fundy, on the coast of Nova Scotia, and in the 

 Gulf of St. Lawrence northward to Greenland, living on stones, shells, 

 nullipores, &c., from low-water to fifty fathoms. In June, 1899, Mr. Low 

 collected a small specimen of this species in Richmond Gulf, Hudson Bay. 



Trachydermon albus (L.). 



Chiton albus, L. (1766) ; O. Fabricius (1780) ; et auct. 

 Trachydemion albus, Carpenter (1873) ; and Dall (1878). 

 Isehnochiton (Trachydermon) cdbus, Pilsbry (1892). 



The geographical and bathymetrical distribution of this species is 

 essentially similar to that of the preceding. , 



Trachydermon ruber (L.). 



Chiton ruber, L. (176G) ; et auct. 



CJiiton cinereus, O. Fabricius (1780) ; non L., nee auct. 

 Trachydermon ruber. Carpenter (1873). 

 Ischnochiton ruber, Pilsbry (1892). 



Grand Manan, "excessively abundant just below low-water mark, on 

 rocky bottoms, especially on the various species of JVullipora " (Stimpson). 

 " Very common in Casco Bay and Bay of Fundy from low-water mark to 40 



