Mr. J. S. Baly on new Phytophagous Injects. 55 Medusa_, conspicuous through the walls of the gonophore by the fine carmine-coloured bands by which the inner surface of the stomach is marked. When the Medusa escapes from the gonophore, it is seen to present a structure which is very peculiar. The umbrella is of a nearly spherical form, with two marginal tentacles continuous with two opposite radiating canals. A small bulbous dilatation is situated at the intersection of each of the other two marginal canals with the circular canal, but no tentacle is here developed. There is a wide velum. The manubrium is well developed, of a nearly cylindrical shape ; and the mouth is not furnished with lobes or tentacles. The structure of the two marginal tentacles is very remark-able. Each commences with a wide bulbous dilatation con-taining reddish pigment-granules, and is then, for the remainder of its length, closely set along its external side with pedunculated oval sacs filled with thread-cells. Another striking peculiarity in the Medusa consists in a csecal tube which is given off from each of the tentacular bulbs, and then running in the substance of the umbrella, close upon its outer surface and exactly parallel with the corresponding radiating canal, becomes slightly dilated as it proceeds, and terminates, after a short course, in a blind extremity. An exactly similar tube is given off from each of the two interme-diate bulbs. The contents of these caeca are a clear fluid with thread-cells. I propose for the Coryne here described the specific name of Briareus. VI. — Descriptions of new Genera and Species of Phytophagous Insects. By J. S. Baly, Esq. Eam. Chrysomelidae. Genus Doryphora, IlHg. Doryphora dilaticollis (Dej.). D. oblonga, convexa, nitido-viridi-senea, caeruleo-micans ; thorace utrinque foveolato, subremote punctate, utroque latere in laminam obliquam subacutam producto ; elytris subcrebre punctatis, punc-tis obsolete subseriatim dispositis, interstitiis aciculato-reticulatis. (Foem.) Thoracis lateribus non dilatatis, rotundatis, antice an-gustatis. — Long. 8 lin. Hab, Brazil. Doryphora carulea. D. oblonga, convexa, nitido-cserulea ; thorace remote punctate, ely-
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