abundance, spring short, simple, or slightly branched, jointed filaments. 

 The structure of the membrane, as shown at fig. 3, is very beautiful. The 

 outer surface of the frond is composed of slightly inequilateral, 4- or 5 -sided 

 cells with thick walls, and containing a granular, pale-olive endochrome. 

 These are internally strengthened by a lattice-work which lines the whole 

 frond, whose meshes are 12-16 times as large as the cells of the membrane. 



We are not informed by whom this species was first observed. 

 The honour rests between Miss Hutchins and Mr. Borrer, by each 

 of whom it was found in different localities early in the present 

 century, and named, by Dillwyn, in honour of Mr. Dawson Turner, 

 the distinguished author of the ' Historia Fucorum! Unfortu- 

 nately Mr. Dillwyn delayed for several years the publication of 

 the species, and it first appeared under this name in the volume 

 of English Botany for 1813; in which same year, Lamouroux, 

 unaware of the long-conferred manuscript name, published it as 

 a new species, conferring upon it the specific name bullosas, by 

 which it is still universally known on the continent. It is a 

 question which specific name has the priority in publication, and in 

 an ordinary case I should feel bound to follow the majority — who 

 have decided in favour of bullosus, — but I am unwilling, without 

 better grounds, to deprive the Father of modern Phycology of a 

 well-merited compliment ; and I therefore follow Hooker in 

 retaining the specific name earliest proposed — though not pub- 

 lished. 



Asperococcus Turneri appears to delight in land-locked muddy 

 bays, where it grows to the gigantic size mentioned in the des- 

 cription. Specimens upwards of three feet in length, have been 

 dredged by Mr. Thompson in Strangford Lough. I have seen 

 individuals not much inferior in the little harbour of Dingle, and 

 in the long, deep channel which divides Valentia from the main- 

 land. When growing in deep water its favourite habitat is on 

 the stems and leaves of Zoster a. Specimens gathered within the 

 tide range are of much smaller size, not more than a few inches 

 in length. Except in size it is subject to little variation. It 

 may always be known from A. cchinatus by its greater delicacy 

 of texture, more evident reticulations, paler colour, and more 

 obtuse and inflated frond. 



Fig. 1. Asperococcus Turnkiu. 2. Small section magnified, showing the 

 spots of fructification, vertical view. 3. Fragment more l>i<jlili/ Magnified, 

 to shew the internal net-w ork. \. One of the spots of fruit, viewed laterally. 



