CYC 



[ 124] 



C Y P 



to the first arrangement of Lin- 

 naeus, but subsequently placed 

 among the ferns. 



CY'CLAS. (pi. cyclades.) A genus of 

 lacustrines, or fresh- water bivalves. 

 The calciferous grit near Hastings 

 is full of cyclades, and several 

 species of cyclas occur, in myriads, 

 in the shales and clays of the 

 "Wealden formation. Mantell. 



The clycas is an ovato-transverse 

 bivalve, not inflected on the fore 

 part ; the hinge with three hinge- 

 teeth and two lateral teeth, com- 

 pressed and rather remote. Par- 

 kinson. 



"While the clycas of Europe is 

 described as small, thin, and 

 horny, abounding in ditches, ponds, 

 and slow streams, that of Asia is 

 stated to be very large. The cyclas 

 is viviparous. 



CY'CLE. (from KVK\OS, Gr. cycle, Fr. 

 ciclo, It.) A round of years which 

 go on from first to last, and then 

 return to the same order as before ; 

 a space in which the same revo- 

 lutions begin again. 

 CY'CLOTD. (from icv/cXos, and e$>os, 

 Gr. cyclo'ide, Fr.) A geometrical 

 curve ; a figure made by the upper 

 end of the diameter of a circle, 

 turning about a right line. 

 CYCLOI'DIANS. (from KV/C\O?, Gr.) 

 The fourth order of fishes, according 

 to the arrangement of M. Agassiz. 

 Families of thii order have their 

 scales smooth and simple at their 

 margin, and often ornamented with 

 various figures at the upper surface. 

 The salmon and herring are 

 examples. 



CYCLOI'DEAN. Belonging to the fourth 

 order of fishes, according io the 

 arrangement of M. Agassiz. The 

 cycloidean and ctenoidean orders 

 succeeded the placoidean and ganoi- 

 dean. 



CY'CLOMTE. (from KVK\OS and \i'0os, 

 Gr.) Another name for madrepore. 

 CY'CXOPITE. A sort of zeolite, resem- 

 bling analcime, found in the pores 



of the lava of Etna. The pores of 

 the lava are sometimes coated, or 

 entirely filled, with carbonate of 

 lime, and with a zeolite resembling 

 analcime, which has been called 

 cyclopite. Lyell, Principles of Geo- 

 logy. 



CYCLOP'TERIS. A genus of plants of 

 the coal series. 



CY'LINDER. (icvXivdpos, Gr. cylindrus, 

 Lat. cylindre, Fr. cilindro, It.) A 

 solid formed by the revolution of 

 a rectangular parallelogram about 

 one of its sides, so that it is ex- 

 tended in length equally round, 

 and its ends or extremities are 

 equal circles. 



CYLI'NDBOID. A solid, in many 

 respects resembling a cylinder, but 

 having elliptical instead of circular 

 extremities, yet parallel and equal. 



CYLINDBICO'DON. The name given to 

 a genus of oviparous quadrupeds. 



Under this name, Dr. Jaeger, of 

 Stutgard, has described the remains 

 of a fossil reptile, of which almost 

 the entire upper jaw, with the 

 teeth, has been discovered by him 

 in the Keuper formation of Ger- 

 many, near Wurtemburg. 



CYME, (cyma, Lat. /a)/*a, Gr.) 



1. A form of inflorescence, the 

 general appearance of which re- 

 sembles an umbel, and agrees with 

 it in this respect, that its common 

 stalks all spring from one centre ; 

 but differs in having those stalks 

 alternately and variously divided. 

 The oleander and elder are ex- 

 amples. 



2. A sprout, as of a cabbage. 

 CYPERA'CE^. A tribe of plants 



answering to the English sedges; 

 they are distinguished from grasses 

 by their stems being solid and 

 generally triangular, instead of 

 being hollow and round. Together 

 with graminea3, they constitute what 

 writers on botanical geography often 

 call glumacese. Lyell, Principles of 

 Geology. 



