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 



