1918] Gardner: New Pacific Coast Marine Algae 11 441 



Cells spheroidal or slightly obovate, somewhat anpnlar when com- 

 pressed, solitary or mostly g-roiiped together in small elnsters, np to 

 25/A diam. ; cell wall hyaline, lumiogeneous, thin. 1.5^ thick ; cell con- 

 tents pale blue-green at maturity, finely granular ; gonidangia 18-25^ 

 diam., the whole cell contents dividing into small spherical gonidia. 



Growing on Porphi/ra pt rforata forma lanc(<)lata. along high-tide 

 level. Lands End, ISan Francisco, California. April, 1917. 



This species of Dermocarpa probably grows also on other hosts in 

 the same locality. Groups of cells resembling those of this species 

 have been observed intermixed with Radmsia and Pleurocapsa grow- 

 ing on small species of Enteromorpha and Ulva, but it is difficult to 

 determine the separate members in such a mixture. The material 

 found on Porphyra was free from other forms. It seems to occupy 

 an intermediate position, as regards its gregarious habit, between 

 D. fucicola and D. suffulta^ the former growing in compact colonies 

 and the latter almost always singly. 



Hyella littorinae Setchell et Gardner sp. nov. 

 Plate 37, figs. 19-20 



Filamentis erectis numerosis, rectis, parallelis, simplicibus aut 

 sparse ramosis, 75-85yLi longis, 10-14:fji diam. ; incremento longitudinali 

 per partitiones cellularum apicalium ; cellulis ad basim filamentorum 

 angularibus 4-6/x diam. ; partitionibus in directionibus omnibus ; 

 cellulis terminalibus filamentorum erectorum cylindricis, 20-30/i 

 longis; contentu cellularum caeruleo-viridi, homogeneo; parietibus 

 cellularum (aut vaginis) hyalinis, homogeneis, 2.5-3.5ju, crassis; goni- 

 dangiis adhuc ignotis. 



Erect filaments numerous, straight, parallel, simple, or sparsely 

 branched, 75-85/a long, 10-14ju, diam. ; growth in length by division 

 of apical cell ; basal cells of filaments angular, 4-6/x diam., divisions 

 in all planes; terminal cells of erect filaments cylindrical, 20-30/a 

 long ; cell contents blue-green, homogeneous ; cell wall or sheath 

 hyaline, homogeneous, 2.5-3. 5/a thick, gonidangia unknown. 



Growing on Littorina planaxis Nutt. along high-tide level on rocks. 

 Common along the coast of Calif(n^nia. but probably grows wherever 

 this species of Littorina occurs from San Diego to Sitka. The type 

 material is from Carmel, Monterey County, California. 



For a discussion of the relation between the genera Hyella and 

 Badaisia see page 430 of this paper. 



Reproduction by gonidia has not been observed in this species, 

 but the vegetative characters are so similar to those of Hyella 

 caespitosa growing in the sliells of oysters and other mollusks, as to 

 leave room for little doubt as to its close affinit\' with that species. 

 The prostrate filaments, characteristic of Hyella c^iespitosa, have not 



