Mr. Walker on the British Chalcidites. 449 ral cavity of the Crinoidea, and which serve for the insertion of their rays. In fact there is nothing in these animals which can be com-pared to a bason, to costal or intercostal pieces, to a shoulder blade, to arms, to a hand, to fingers, to tentacula, to a clavicule, to pectoral or capital plates, and which would justify the use of these terms to designate simple calcareous plates similar to those of the Echinus and Starfish, disposed even in general, as in those two families, and offering no other differences than the following ; namely, that at the dorsal surface a certain number of plates is developed one upon the other, which form a pedicel more or less long and moveable ; that the principal cavity of the animal is surrounded at its sides by laminae varying much in number and in form in the different genera, and arranged very diversely around the mouth ; and lastly, that the rays which depart from the central disc ramify in various ways. In order to simplify the names generally so very long which have been given to the genera of the family of the Crinoidea, I have everywhere changed the termination crinites into crinus, as M. de Blainville had previously done for some of them. L. — Descriptions of British Chalcidites. By Francis Walker, F.L.S. [Continued from p. 387.] Sp. 16. Cirrospilus Lycophron, Fern. Cupreus, antennce nigrce, pedes virides Jlavo-cincti, alee limpidce. Obscure cupreus : oculi et ocelli rufi : antennae nigrae ; articulus l us aeneus : abdomen cupreum, basi micans : pedes virides ; trochanters fusci ; genua albida ; tarsi fulvi, apice fusci : alae sublimpidae ; squamulae piceae ; nervi fulvi. (Corp. long. lin. | — % ; alar. lin. 1 — 1£.) Far. /3. Purpureo-cupreus : tarsi laete flavi, apice fusci. Found near London. Mas. Corpus sublineare, laeve, nitens, parcehirtum: caput transversum, breve, convexum, juxta thoraci latum ; vertex angustus ; frons abrupte de-clivis : oculi sat magni : antennse setaceas, hirtae, corporis dimidio multo longiores ; articulus l" s gracilis, sublinearis ; 2 US longicyathiformis ; 3 US et sequentes longi, lineares, usque ad 7 um attenuati : thorax longiovatus, con-vexus : prothorax mediocris, transversus, antice angustior : mesothoracis scutum longitudine vix latius ; parapsidum suturae bene determinatae ; scu-tellum obconicum ; metascutellum parvum, transversum : metathorax con-spicuus : petiolus brevissimus : abdomen ovatum, planum, thorace brevius ; segmentum l um sat magnum, 2 um et sequentia breviora : pedes mediocres, simplices, subaequales ; tarsis articuli 1° ad 3 um curtantes, 4 US longior; ungues et pulvilli sat magni ; protarsis articulus l us brevissimus : aire angustae, breviter ciliatae ; nervus ulnaris humerali longior, radialis nullus, cubitalis crassus in alas discum abrupte declivis, stigma minutum. Am. Nat. Hist. Vol. 1. No. 6. August 1838. 2 g
BioStor
