from one side of the vessel to the other, interlacing with each other at nearly regular intervals and producing a series of intersections, (fig. d). The tissue investing these muscular bands, or in other words, the cellular coat of these vessels, on examination with a power of 400 linear, appears well developed and exhibits a fibrous structure, and the fibres intersect each other diagonally; it is covered with numerous ramifying vessels, which contain dark granules like those from pigmental cells, which well exhibit the molecular movement so common to all minute globular bodies.
Each trunk, about its middle, is about 1⁄40 of an inch in diameter, and in a space equal in breadth to one diameter, there are about fifteen bands; each band is therefore about 1⁄600 of an inch in diameter, and presents a dotted appearance, in which it very much resembles in structure the fibres of the muscular tunic of the œsophagus, and those placed immediately underneath the true skin which have been before described. The dotted appearance is so constant in the fibres of these Hirudinidæ, as to become characteristic of the muscular tissue in this order of animals.John Quekett.
(To be continued).
Insects.
Note on the Medic Egger (Lasiocampa Medicaginis). The larva of this moth is not unlike that of the oak egger (Lasiocampa Quercûs), but the ground colour, instead of being brown, as in that insect, is of a dingy yellow; the pupa is enclosed in a yellow cocoon. Two caterpillars were found on the cliffs at Teignmouth, and one at Bovey Heathfield; one of them died, one of the others produced a male and the other a female moth. The male is rather smaller than the male fox moth (L. Rubi), and is of a bright reddish brown colour; the upper wings have a white spot in the middle between two white streaks, the one near the tip of the wing is well defined, the other more indistinct; an obscure whitish streak passes through the middle of the second pair. The female is larger, of an uniform dull reddish brown, with a white spot in the centre of the upper wings.—W.R. Hall Jordan: Teignmouth, December, 1842.
Note on the Capture of Thera juniperata. Having noticed on the evening of the 7th of November, 1842, this insect flying about the juniper-trees which abound on Mickleham Downs, I visited the spot
