LAND AND FRESH-WATER SHELLS. 179 
tumidus and pictorum, and one of abnormal dimensions and 
thickness.” 
Var. radiata.— Occurs among the rest. 
Var. ovalis.—‘‘ Ouse above York” (Brown’s ‘TIllust. Con- 
chology,’ p. 111). 
Var. radiat-ovalis.—In November, 1877, I obtained from the 
Foss, by Yearsley Lock, several dead specimens of the variety 
which has, I believe, received this name at the hands of various 
Bristol conchologists. In shape it is the same as the true var. 
ovalis, but differs from it in colour, which should be of a very 
dark brown, but is light greenish, like the var. radiata ; hence the 
pame. 
Unio pictorum.—Very fine and very abundant in the Ouse, 
but the number below the city far exceeds that above. Also in 
great profusion in the Foss, particularly near Foss Islands (H.) 
From one specimen I obtained a pearl about the size of a No. 1] 
shot, but irregularly shaped. 
Var. radiata.—Pretty common among the rest. 
Var. curvirostris.—Both in the Ouse and in the Foss, but not 
common in either. 
Anadonta cygnea.—Fine in the largest pond at Hobmoor, and 
probably also at Askham. Very abundant in the Foss above 
Yearsley Lock (H.) A gigantic specimen in the York Museum 
came out of Fairfield Pond (H.) A curious stunted form is found 
in the Ouse near New Walk (H.) 
Var. rostrata.—A number in the Foss are, I believe, of this 
variety. 
Var. avonensis, Turton.—In the Ouse, but not abundant. I do 
not know what this corresponds to in Mr. Jetfrey’s work. 
Var. radiata.—In the Foss near Blue Bridge, abundant and 
very fine (H.) 
Anadonta anatina.— Prevails in the Foss below Yearsley 
Lock (H.) To be found in the Ouse in any quantity; but none 
are large, the biggest I have seen not measuring four inches in 
width. Whether the inhabitants of York eat them or not I 
cannot say, but frequently when the water has been low, and 
I have been collecting them, I have been asked, in the most 
innocent way possible, whether I was going to do so. “When the 
river is lowered, they extend their large foot and crawl down the 
bank into the water again, their track being sbown by a queer cut 
