Dr. J. E. Gray on Elachista stellaris. 401 
varice externo forti. Operculum normale; costa interna ad am- 
bas extremitates torta. 
Long. 7, diam. vix 3 mill.; ap. 23 mill. longa, 12 lata. 
Habitat Bombay. 
Some specimens are smaller than the above: one with only 
five whorls remaining (one, at least, having been lost by ero- 
sion) measures only 5 millimetres in length by 2 in diameter. 
The specimens found by myself were living on mud between 
tide-marks on the shore of Bombay Harbour. I believe Dr. 
Leith’s and Mr. Fairbank’s specimens were from the same 
locality. The principal Mollusca associated with them were 
species of Assiminea, Haminea, and Ampullarina. 
L.—Qn Elachista stellaris, a Seaweed new to the British 
Flora. By Dr. J. E. Gray, F.R.S., V.P.Z.S., &e. 
Mrs. ALFRED GATTY has submitted to my examination some 
specimens, and some very accurate pen-and-ink sketches, of 
a species of Hlachista which she regards as different from 
any that has hitherto been described as inhabiting the English 
coast. Mrs. A. Gatty discovered it growing on Arthrocladia 
on the Cardigan-Bay side of the Carnarvonshire promontory, 
at Pwllheli, and four miles further west at Llandwrog. 
At first I thought that it might be the long-sought-for Z. 
eurta of Dillwyn in a more perfect condition, a plant that has 
not been recognized on the English coast for the last fifty 
years. On careful comparison with the description in Agardh’s 
‘Species, Genera et Ordines Algarum’ (vol. i. p. 9) there was 
no doubt that it is the Hlachista stellaris of Areschoug’s 
‘Dried Scandinavian Alge’ (part 3. no. 71), described in his 
paper in the ‘ Linnea,’ xvi. p. 233. 
Elachista stellaris is known from all the other species of the 
genus by the filaments being nearly simple, radiating from a 
small, dense, hemispherical tubercle; the threads are rather 
narrowed below, and very much attenuated and produced into 
a long slender tip above; the joints of the lower part of the 
thread are as wide as long, and of the upper part two or three 
times as long as wide; the spore is oval, shortly pedicelled. 
Dillwyn, in his ‘ British Confervee,’ described and figured a 
species under the name of Conferva curta (t. 76), which he 
says is not uncommon at Swansea. Knowing that Mrs. Stor 
Maskelyne had the whole or part of her grandfather’s collec- 
tion, I wrote to her, requesting that I might be allowed to 
examine one of Mr. Dillwyn’s original specimens ; but, unfor- 
tunately, the part of the collection that she possesses does not 
