58 
Natural History 
A . testudinalis Muller. 81. var. patina Esch. 52, 38. 
Between tides. “ Specimens of patina from Sitka and the Aleutian 
Islands are indistinguishable from specimens of the same size from Eastport, 
Maine,” Dali, 36. 
A. testudinalis , var. alveus Dali. 86. 
Narrowed by living on a frond of seaweed or Zostera. Vic., Cadboro’ 
Bay, (G.W.T.) 
A. testudinalis, var. scutum Esch. 52, 36, 29. 
Between tides. 
A. pelta Esch. 52, 36, 29. 
Between tide marks, Vic. to Q.C.I. 
A. persona Esch. 52, 36, 29. 
Between and sometimes above tide marks, (Dali, 36). Yic. to Q.C.I. 
The rough form (A. digitalis Esch., 52.) is more common than the smooth. 
A. instabilis Gld. 60, 36, 29. 
Clayoquot Sd , (C.F.N.) Yic., and Barclay Sd., (Cowley). Bare at Yic.; 
abundant, dead, on the West coast of Y.I. Lives on the stems of Macro- 
cystis , the giant kelp. Flattened laterally. 
Family LEPETIDH3 
Genus Cryptobranchia Dali ex Midd. 
C. concentrica Dali. 78, 36, 28. 
Yic., (G.W.T., C.F.N., N.H.S.) Comox, Clayoquot Sd., (C.F.N.) Q.Ch. 
Sd., Quatsino Sd., and Q.C.I., (G.M.D.) Low water to 80 fms. Sculpture 
usually faint. 
Family FISSURELLIDiE 
Genus Fissuridea Swainson, 1840. 
F. aspera Esch. 52. 
Yic., (G.W.T., C.F.N.) Salt Spring I., and Clayoquot Sd., (C.F.N.) St. 
of Georgia, Johnstone and Broughton Sts., Goletas Channel, North-west 
coast of Y.I., and Q.C.I., (G.M.D.) At or near low water mark. Frequently 
shelters a commensal parasitic worm, Lepidonotus Lordi , Baird, (‘ four out 
of six/ Lord, 74, Yol. II., p. 10.) 
Genus Puncturella Lowe 
T. Cooperi Cpr. 12, 13. 
Dep. Bay, (G.W.T.) In 20 fms. 
