N QAP OW 
PLATE VII. 
. Navicuta Cragpro, Ehrenberg. a, the typical 
form, from the coast of Northumberland ; 
b, short var., from the estuary of the Clyde. 
. Navicuna IntERRUPTA, Kiitzing. 
Navicuua Aris, Ehrenberg. 
Navicuxa tncurvata, Gregory. 
Navicuta Entomon, Ehrenberg. 
Navicuta Musca, Gregory. 
. Navicuta Bompvus, Ehrenberg. a, the typical 
form, from the estuary of the Clyde; 4, the 
less-constricted var., from the coast of North- 
umberland. 
8a & 8b. NavicuLa pipyma, Ehrenberg. 
