104 COLLINS AND HERVEY. 



2089; Fucus crinalis Turner, 1819, p. 4, PL CXCVIII. North Village, 

 Dingle Bay, Jan., Hervey. A slender, irregularly branching form; 

 the erect filaments are more flattened than in the common northern 

 forms, and the branching is scanty, but there seems to be no better 

 place for it than here. 



3. G. sPATHULATtTM (Kutz.) Bomet, 1892, p. 268; G. crinale 

 var. spathulatum Hauck, 1885, p. 193, fig. 84; Acrocarpus spathulatus 

 Kiitzing, 1868, p. 13, PI. XXXVI, d-g. Harrington Sound, Feb., 

 Hervey. Resembles G. crinale, but the upright fronds are terete ex- 

 cept at the summit, where they are suddenly flattened; in the fruiting 

 specimens numerous short branches arise here, making a tubercular 

 mass, but always showing a distinct flattening. 



4. G. PusiLLUM (Stack.) Le Jolis, 1863, p. 139; P. B.-A., No. 2182; 

 Fucus pusillus Stackhouse, 1795, p. 16, PI. VI. North Shore, Jan., 

 Nov., Tucker's Town, Feb., Hervey; above and below Flatts Bridge, 

 April, May, Aug., ColUns. Tetraspores in March, April, Nov. Very 

 common on pebbles, shells and flat rock bottom in shallow quiet 

 water all about the islands, forming a dense mat, usually not over 

 one cm. in thickness, the creeping basal part and the lower part of 

 the upright growth terete, the upper part flat. As we understand 

 this species, it includes G. pulvinatum (Kiitz.) Thuret, and G. repens 

 Kiitz. Forms corresponding to Kiitzing's plates of both of these, as 

 well as to typical G. pusillum, are found in Bermuda material, with 

 all intermediate forms. 



Var. coNcmcoLA Piccone & Grunow in Piccone, 1884, p. 316, 

 P. B.-A., No. 2183, is a reduced form, common on small shells in 

 shallow water; the upright fronds seldom reach 5 mm. high; they 

 are mostly flat for their entire length, and only sparingly branched. 

 But the same form occurs also on stones, and every intermediate can 

 be found up to plants with erect fronds, 2 cm. high. Forms which 

 we refer to G. pusillum occasionally occur in which the terete stipe 

 expands into a flat frond, up to 5 cm. long and 3-5 mm. wide. This 

 is very different in appearance from the usual form, but it intergrades 

 so that it and var. conchicola must be regarded as extreme forms of a 

 very variable species. 



WtTRDEMANNiA Harvey. 



W. SETACEA Harvey, 1853, p. 246; P. B.-A., No. 1887. A very 

 common plant in quiet shallow water, all about the islands and 

 dredged down to 18 m. It is quite variable in size, amount of rami- 



