78 REPORT—1849. 
to our sight and feeling. So much for the qualities by which vitality has correlations 
with all other forces. But there still remains a difference—vitality is the artist of its 
own coils. No other force can make an organ of either an animal or a plant (the 
coil by means of which their vitality is evinced), Neither a Volta nor an Cirsted 
could have invented an eye or an ear, or even a graft by which the sap of a fruit-tree 
is so modified as to differ from that of the parent stock. 
The author added instances of the light of fire-flies, glow-worms, and some marine 
animals, as instances of production of light, apparent to the vision of others by vitality. 
And any person may satisfy himself of the ease with which a flash of light, the pro 
ducts of his own vitality, may be rendered perceptible to himself, by putting a plate 
of zine between the gums and the cheek in one side of the mouth and the broad 
handle of a silver spoon in the other, and then (in the dark) he will see a flash of 
light at every instant of contact and separation of the zinc and silver. 
That mind and vitality reciprocally excite and depress each other must be obvious 
to al! who are attentive to their daily feelings; and all conversant with surgical prac- 
tice must be aware of the difference in healing of wounds in a healthy or exhausted 
subject. 
J.G. Jeffreys, Esq. exhibited some rare mollusca which had been recently col- 
lected by Mr. Barlee in Zetland. Among these were Rissoa eximia, anew species, of 
_ which Mr, Jeffreys gave a description; Diphyllidia lineata (Otto), new to the British 
coasts; Fusus Berniciensis; F. albus; Trochus formosus; Cerithium nitidum; Ros- 
tellaria pes Carbonis; Scissurella crispata (which was taken by Mr. Barlee alive, and 
adhering to stones like Emarginula), Megathyris cistellula and Tellina balaustina. 
On the Course of the Blood in the Circulation of the Human Fetus in the Nor- 
mal Developement, compared with the Acardian, Reptilian, and Ichthic Circu- 
lation. By Dr. Macponatp. 
On the External Antenne of the Crustacean and Entomoid Class, and their 
Anatomical Relation and Function, showing their connexion with the Olfactory 
instead of the Auditory Apparatus, and the Homology in the Vertebrate 
Class. By Dr. Macpona.p. 
On Lucernaria inauriculata. By Professor Owen, M.D., F.RS. 
Professor Owen communicated a description of the external characters and anatomy 
of a Lucernaria which he had found near low-water mark on the flat rocks to the east 
of Dover, August 1849, attached to the Ulva latissima: it differed from the Lucernaria 
quadricornis, or L. fascicularis, in having the eight tentaculiferous lobes equidistant 
from each other, and it differed from the Lucernaria auricula in the absence of any ear- 
like appendage at the middle of the border of the connecting webs between those 
lobes. It differed from the Lucernaria campanulata in the absence of the “ two series 
of foliaceous processes arranged on each side of a white line*,” extending from the 
sides of the mouth along the middle of each connecting web; and by the presence of 
a convoluted coloured filamentary body extending from the circumference of the 
mouth to the tentaculiferous extremity of each of the eight lobes. It also differed 
from the L. cyathiformis in the tentacles being supported, in clusters, at the extremity 
of lobes produced beyond the margin of the infundibular disc. ; 
The specimens varied from an inch to half an inch in length. One variety had ten 
lobes. The stem of the polype, which is ordinarily slender and as long as the ex- 
panded body, terminates in an adhesive disc or base, in the centre of which is 
a small triradiate pore or pit, with a thickened border or sphincter. There is no car- 
tilaginous lamina in this disc. Four canals commence from the central pore or pit, 
and ascend the stem projecting into the central digestive cavity, but separated from 
the cavity by its lining membrane, which is reflected upon the four canals; forming 
as many longitudinal folds projecting into the digestive cavity. 
* Johnstone’s British Zoophytes, 1846, p, 249, fig. 56, db, 

