CYCAS. 



[ 181 ] 



CYCLOPS. 



tubes are said to be unreliable in some cases 

 into spiral ribands. In Zamia and Ence- 

 phalartos there does not appear to be a di- 

 stinction of concentric rings of wood, but in 

 Cycas these exist, separated by layers of 

 cellular tissue. The rings, however, are 

 not "annual," onlv five or six existino: in 

 large old trunks. The leaves of the Cyca- 

 daceae possess a remarkably solid epidermal 

 structure, and in Cycas the upper thickened 

 walls of the epidermal cells exhibit pore- 

 canals or deep pits running from the cavity 

 of the cell toward the outer surface, as well 

 as towards the contiguous cells (PL 38. fig. 

 2S). See Epidermis. The pollen of the 

 Cycadaceae is angular, collected in masses 

 and transparent; it is contained in anthers 

 of peculiar form seated on the lower surface 

 of the scales of the male cones. 



BiBL. Don, Ann. Nat. History, v. 48; 

 Linn. Trans, xvii. ; Brongniart, y4nn. des 

 Sc. nat. xvi. 58.9 ; Mohl, Vermischt. Schrift. 

 1.95 ; Link, Icon. Select, fasc. ii. t. ix. & xv.; 

 Miquel, Linncea, xviii. 125. and pi. 4, 5, 6 

 (transl. Jnn. des S. nat. 3 ser. v. 11). Also 

 the works referred to under Gymnosper- 



MIA. 



CYCAS, L. See Cycadace^. 



CYCLIDINA, Ehr.— A family of Infu- 

 soria. 



Char. No carapace; a single alimentary 

 orifice; appendages in the form of cilia or 

 bristles. 



{Flattened, cilia forminei ^^ ,. ,. _ 

 acircle ^ } Cj^chdmm. 

 Rounded, cilia scattered Pantotrichum. 

 """ I. bristles ChcetomoHus. 



BiBL. Ehr. Infus. p. 244. 



CYCLIDIUM, Hill, Ehr.— A genus of 

 Infusoria, of the family Cyclidina. 



Char. Body compressed ; organs of loco- 

 motion a circle of abdominal cilia-like feet. 



The gastric sacculi w^\ admit coloured 

 particles. 



C. glaucoma (PL 23. fig. 37 c, side view; 

 f?, dorsal view). Oblong, elliptical, entire ; 

 circle of cilia large ; dorsal lines very fine ; 

 aquatic; length 1-2880 to 1-1150". 



C, margaritaceum. Orbicular - elliptic, 

 slightly emarginate posteriorly ; cilia obso  

 lete; pearly; aquatic; length 1-2100 to 

 1-1000". 



Two doubtful species, — C. planum and 

 lentiforme. 



Dujardin includes his species of Cyclidium, 

 the relation of which to those of Ehrenberg 

 is doubtful, in the family Monadina ; \sith 

 the characters : 



Body disk- shaped, depressed or lamelli- 

 form, but little variable iu form, with a single 

 flagelliform filament. Four species : 



C. nodulosum. With series of nodules and 

 vacuoles ; motion extremely slow ; aquatic ; 

 length 1-530". 



C, abscissum (PL 23. fig. 37 b). Lamelli- 

 form, oval, truncated posteriorly ; motion 

 slow; aquatic; length 1-920". 



C. distort um (PL 23. fig. 37 a). Oval, 

 nodular, irregularly twisted ; margin thick- 

 ened ; aquatic; length 1-1800". 



C. crassum. Aquatic; length 1-1800 to 

 1-1100". 



BiBL. Ehr. Infus. p. 245; Duj. Infus. 

 p. 286. 



CYCLODIUM, PresL— A genus of Aspi- 

 dieae (Polvpodiaceous Ferns). Exotic. 



CYCLOGLENA, Ehr.— A genus of Rota- 

 toria, of the family Hydatinsea. 



Char. Eyes more than three, forming a 

 cervical group ; foot forked. 



Pharyngeal jaws with one or perhaps three 

 teeth ! 



C. lupus (PL 34. fig. 18). Body ovate- 

 oblong or conical, not auricled; foot and 

 toes short; aqviatic; length 1-144 to 1-120". 



C? elegans. In Egypt. 



BiBL. Ehr. Infus. p. 453. 



CYCLOPS, Muller.— A genus of Ento- 

 mostraca, of the order Copepoda, and family 

 Cyclopidae. 



Char. Foot-jaws large and strong, branched; 

 eye single, frontal ; inferior antennae simple ; 

 external ovaries two. (Both superior antennae 

 in the male furnished with the swelling and 

 hinge-joint). 



C. quadricornis (PL 15. figs. 8-15). The 

 only species. Variable in colour; aquatic; 

 length 7-12 to 9-12". 



Char. Those of the genus. 



Thorax composed of four, and abdomen 

 (apparently the tail) of six segments; head 

 consolidated with the first and lai'gest joint 

 of the thorax; last joint of abdomen con- 

 sisting of two separate lobes. 



Superior antennae (figs. 8, 9 a) composed of 

 many joints (twenty-six, Baird), from each 

 of which one or more setae arise; in the 

 male, each superior antenna exhibits a swel- 

 ling at about its middle (fig. 8 b) followed by 

 a sudden contraction, the first articulation of 

 which forms a hinge- joint; inferior antennae 

 (fig. 9 b) four-jointed, each joint with setae, 

 the terminal with six of unequal length. 

 The mandibles (fig. 11) consist of an ovate 

 body (a), narrowed and twdsted above, and 

 terminating iu a number of brownish teeth. 



