FROM THE NORTH-WEST AMERICAN COAST. 169 
giatis, pinnulis ultimis flexuoso-alternis subulatis erecto-patentibus ; 
articulis 14-16-siphoniis, ramorum diametro 8-12-plo v. multoties 
longioribus, ramulorum diametro zqualibus v. vix brevioribus. 
Sandy beach near low water, Point Roberts, lat. 49° N., Dr. Lyall. 
Filaments 5-6 inches long, flaccid, but not softening, sparingly 
divided into a few, long, naked primary branches, which sometimes 
have one or two small subulate ramuli below, and are closely set 
near the apex with bi-pinnate branchlets or plumules. Each plu- 
mule is 3-4 lines long and 2-3 broad, with a circumscribed outline. 
Colour, brown-red. A distinctly marked form, but not specifically 
different from the common P. Californica. 
34. Polysiphonia urceolata, Grev.; Harv. Ner. Bor. Amer. ii. p. 32; 
Ph. Br. t. 167. 
Esquimalt ; Fuca Strait; Point Roberts: common. 
35. POLYSIPHONIA SENTICULOSA, n. sp. Filis 2-3-uncialibus pellucide 
articulatis capillaribus mollibus cespitosis siccitate badiis decom- 
posite ramosissimis, ramis alternis secundisve bis terve divisis, secun- 
dariis strictis virgatis ramuliferis, ramulis brevibus subuliformibus 
alternis erecto-patentibus, articulis 4-siphoniis ramorum diametro 4-6- 
plo longioribus, ramulorum diametro equalibus v. brevioribus. 
Orcas Island, Dr. Lyall. 
36. Laurencia pinnatifida, Lamour. ; Harv. Ner. Bor. Amer. ii. p. 70; 
Ph. Br. t. 55. 
Low-water rocks, St. Juan de Fuca Strait, C. B. Wood ; Victoria Har- 
bour, Dr. Lyall. 
37. Amphiroa Californica, Deane; Harv. Ner. Bor. Amer. ii. p. 86. 
Imbedded in roots of Laminarie, Fuca Strait, Dr. Lyall. 
38. Amphiroz sp. indeterminata. 
St. Juan de Fuca, S.W., C. Wood ; Esquimalt, Dr. Lyall. 
39. Amphiroa corymbosa, Harv. Ner. Austr. p. 99. t. 38. 
Fragments only. 
40. AMPHIROA (ARTHROCARDIA) EPIPHLEGNOIDES, J. 4g. MSS., 
fide Lenorm. Fronde dichotoma v. vage ramosa flabelliformi, articulis 
difformibus, aliis oblongis vix compressis v. teretibus, aliis cuneatis Y. 
polyhedris margine obtusis, ceramidiis paucis articulis latioribus insi- 
dentibus.—A. rudis, Harv. in Herb. D.C.D. 
Rocks near low-water mark, Fuca Strait, Dr. Lyall. l 
3-4 inches long. Lower and some of the upper joints like 
those of Corallina officinalis; the medial generally broad, short, 
and compressed, triangular or oblate, always rounded at the edge. 
A native also of Tahiti. 
41. ConALLINA OFFICINALIS, L.; Harv. Ner. Bor. Amer. ii. p. 83. 
Rocks between tide-marks, Esquimalt, Dr. Lyall. 
N 2 
