FROM THE NORTH-WEST AMERICAN COAST. 178 
64. Gigartina mollis, Bail. & Harv.; Harv. Ner. Bor. Amer. ii. p. 175. 
Rocks at low water, Fuca Strait, and dredged in 5 fathoms, Dr. Lyall. 
65. Chondrus affinis, Harv. Ner. Bor. Amer. ii. p. 181. 
Esquimalt, Dr. Lyall. 
66. Iridza cordata, J. Ag. ; Turn. Hist. t. 116 ; Ner. Bor. Amer. ii. p. 180. 
_ Esquimalt and Fuca Strait: common, Dr. Lyall. 
Many specimens, of various ages, extremely varied in form; 
some with strictly cordate base, and others gradually passing off 
toward the obovate basally attenuated form called I. lamina- 
rioides, Substance in the younger plants thin and glossy, bright 
purple; in the older thick and fleshy, dull red-brown. 
67. Endocladia muricata, J. 49g.; Harv. Ner. Bor. Amer, ii. p. 182, 
t. 28. B. 
Rocks between tide-marks; Esquimalt, Dr. Lyall; in 5-9 fathoms, 
C. Wood. 
68. Halymenia ligulata, J. 4g.; Harv. Ner. Bor. Amer. ii. p. 192. 
Esquimalt Harbour, 4-6 fathoms, Dr. Lyall. 
Two specimens only ; a broad, flat, nearly regularly dichotomous 
form. 
69. Halosaccion hydrophora, Ag.; Harv. Ner. Bor. Amer. ii. p. 194. 
Esquimalt, on rocks and in tide-pools, Dr. Lyall; on floating wood, 
C. Wood. 
Old fronds 10-12 inches long, 1-14} inch in diameter. Injured 
specimens are frequently proliferous from the wound, or the 
broken sac throwing out numerous sacs from the side. 
70. PRioNrTIS LvALLU, n. sp. Fronde polymorpha membranaceo- 
coriacea siccitate badia seepissime plana plus minus pinnatim et dicho- 
tome ramosa; nunc subsimplici lanceolata pinnis lanceolatis utrinque 
marginata; nunc ramosissima, ramis lineari-cuneatis, basi longe an- 
gustatis margine foliiferis pinnulatisve, pinnis cilizformibus ; nunc 
di-pollachotoma laciniis linearibus patentibus apicibus acutis v. ex- 
planatis. 
Esquimalt, on tidal rocks and rock-pools, Dr. Lyall; Fuca Strait, 
C. B. Wood. 
Between extreme states of this most variable species nothing 
but an extensive suite of specimens can suggest a connexion ; and 
yet I find it impossible to fix limits to the following varieties :— 
Var. a. lanceolata. Fronde 12-14 uncias longa, unciam lata, subsimplici 
lanceolata, pinnis minoribus foliaceis marginata et e disco prolifera. 
Var. 8. ornata. Caule compresso-filiformi tenui parce ramoso, ramis 
latissimis 6-8 uncias longis margine et disco foliiferis. 
Var. y. normalis. Fronde ramosissima digitato-pinnatim ramosa, ramis 
majoribus minoribusque lineari-cuneatis, basi angustatis, 2-4 uncias 
