216 Dr. Greville on some new species of Sargassum. 
ture and in the deep punctures on the elytra it is allied to Man- 
nerheimii, but is a larger and more robust insect; the thorax 
especially is much larger and broader at its basis. 
I captured three specimens near Dorchester in May 1848, a 
pair of which I gave to Dr. Schaum, who informed me by letter 
after his return to Germany, that the species is unknown on the 
continent. 
Ramsgate, February 15, 1849. 
XXIV.— Alye Orientales :— Descriptions of new Species belonging 
to the genus Sargassum. By R. K. Grevitiz, LL.D. &e.* 
[Continued from p, 109.) 
{ With a Plate.] 
WIGHTIANZ. 
13. Sargassum obovatum (nob.); caule subcompresso ; foliis cauli- 
nis obovatis, obtusissimis, subintegris vel obcure dentatis ; aliis 
racemis intermixtis lanceolatis, serratis; vesiculis subellipticis ; 
receptaculis minutis, oblongis, cylindraceis, in racemis densis, 
rotundatis, pedunculatis, aggregatis. 
Hab. in mari Peninsulz Indiz Orientalis ; Wight. 
Root unknown. Plant probably 1-2 feet long, judging from. 
the fragment in my possession, which is apparently a portion of 
one of the primary branches or divisions of the stem; this is 
somewhat compressed, as thick as a blackbird’s quill, beset with 
numerous branches 2-3 inches long, which are bushy with ramuli 
less than an inch in length on which are found the racemes of 
fructification. Leaves: those on the stem above an inch long, 
obovate, quite rounded at the extremity, almost entire or ob- 
scurely repando-dentate, furnished with a nerve which disappears 
at some distance from the end; those on the smaller branches 
often more or less serrated, while those which accompany the 
fructification are much smaller, linear-lanceolate, and sharply ser- 
rate. Vesicles attaiming the size of a small garden pea, varymg in 
_ shape from elliptical to spherical, sometimes apiculate, supported 
on a compressed stalk generally little more than a line in length. 
Sometimes, however, one of the little lanceolate leaves becomes 
converted into a vesicle, and the stalk is then proportionally 
long. Receptacles cylindraceous, oblong, much-divided and lobed, 
forming a dense, roundish, very shortly pedicellated cluster a line 
or more in length. Colour very dark red-brown. Substance 
thick and cartilaginous. 
* Read before the Botanical Society of Edinburgh 11th Jan. 1849, 
