Mr. Walker on the British Chalcidites. 307 narrow ; ambulacra straight and simple, or each formed of two se-ries of double pores. The fossil species are from the jura, chalk, and tertiary deposits. There are also some recent. A. hieroglyphica, Ag. (Echi. hierogl., Gold/.) — A. sulcata, Ag. (E. sulc, Gold/.) — A. nodulosa, Ag. (E. nod., Munst.) — A. granulosa, Ag. (E. gran., Munst.) — A. alutacea, Ag. (E. alut, Goldf.) — A. radiata, Ag. (E. rad., Hcen.) — A.pusilla, Ag. (E. pusil., Munst.) — A. punctulata, Gr. — A. pus-tulosa, Gr. 7. Echinus, Linn, and Auct. — Ambulacra composed of segments of arcs formed by several pairs of pores, and converging uniformly towards the summit; disc circular or subangular, very regular. There are fossil species from the jura, chalk, and tertiary deposits, as also a great number of living ones. E. germinans, Phil. — E. perlatus, Desm. — E. lineatus, Goldf. — E. Me-nardi, Desm. — E. Milleri, Desm. — E. regalis, Hcen. — E. ventricosus, Lam. — E. scardicus, Lam. — E.pcntagonus, Lam. — E. Peleolus, Lam. — E. varie-gatus, Lam. — E.esculentus, Linn. — E. vulgaris, De Bl. — E. lividus, Lam. — E. variolaris, Lam. — E. melo, Lam. — E. miliaris, Lam., &c. [To be continued.] XXXV. — Descriptions of British Chalcidites. By Francis Walker, F.L.S. INSECTA TETRAPTERA NECROMORPHA. Class Hymenoptera. Stirps Ichneumonina. Order Chalcidites. Genus Cirrospilus, Westwood. Fern. Corpus lineare, angustum, sat longum, parum convexum, nitens, scitissime squameum, parce hirtum : caput transversum, breve, parvum, tho-race angustius; vertex angustus; frons impressa abrupte declivis: oculi mediocres, subrotundi, extantes: ocelli vertice triangulum fingentes: an-tennas clavatse, corporis dimidio certe breviores; articulus l us validus, 3 US brevissimus, 4 US mediocris, 5 US brevior et latior ; clava longiovata, apice acuminata ; 5° latior et plus duplo longior : thorax longiovatus : prothorax bene determinates, subtrigonus, transversus, postice latus incurvus : meso-thoracis scutum subquadratum, longitudine paullo latius, postice angustius, latera basi incurva ; parapsidum suturse vix conspicuse ; scutellum obconi-cum ; postscutellum transversum, breve, lunatum, apud latera lseve : meta-thorax transversus, sat bene determinatus : petiolus crassus, brevissimus : abdomen ovatum, depressum, subtus convexum, fere glabrum, thorace paullo brevius non latius; segmenta transversa, l um magnum laeve micans, 2 um et sequentia ad 6 um breviora, subsequalia; pedes sat longi, graciles, subaequales ; coxse parvae; femora subclavata; tibiae rectce; tarsis articulus l us brevis, x 2
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