CAMPTOCERCUS. 



[ 108 ] 



CAOUTCHOUC. 



CAMPTOCERCUS, Baird(LynceM*,Mull. 

 in part). A genus of Entomostraca, of the 

 order Cladocera, and family Lynceidse. 



Char. Carapace ovoid; beak blunt, di- 

 rected forwards or slightly downwards ; ab- 

 domen long, slender, tail-like, extremely 

 flexible and serrated. 1 species : 



C. Macrourus (PL 15. fig. 4). Carapace 

 striated longitudinally, slightly sinuated and 

 ciliated on the anterior margin; beak rather 

 blunt ; aquatic. 



BIBL. Baird, Brit. Entom., p. 128. 



CAMPTOUM, Link. A genus of De- 

 matiei (Hyphomycetous Fungi), allied to 

 Arthrinium. C. curvatum, Lk. (Arthrinium 

 curvatum, Kze.) grows in tufts of very slen- 

 der filaments, bearing very minute, curved 

 spores, upon Scirpus sylvaticus. 



BIBL. Berk, and Br. Annals Nat. Hist. 

 2 ser. viii. 100; Fries, System. Myc. iii. 377; 

 Corda, Ic. Fung. iii. pi. 1. fig. 17. 



CAMPTOSURUS, Presl. A genus of 

 Scolopendrieae (Polypodeeous Ferns). Ex- 

 otic. 



CAMPYLODISCUS, Ehr. A genus of 

 Diatomaceae. 



Char. Frustules single, free, disk-shaped; 

 disk curved or twisted (saddle-shaped) ; fur- 

 nished with mostly radiate markings, which 

 are frequently interrupted. Aquatic and 

 marine. 



The Rev. Mr. Smith terms the markings 

 costse or canaliculi, and interprets them to be 

 minute canals forming means of communica- 

 tion between the internal cell-membrane and 

 the surrounding fluid. 



Mr. Smith describes 7 species (British), 

 Kiitzing 12 others. 



C. costatus. Smith (PI. 12. fig. 16). Valves 

 circular; radii (canaliculi) 30-40, extending 

 about half-way to the centre, which is mi- 

 nutely punctate; diameter 1-270"; aqua- 

 tic. 



C. spiralis, Smith. Outline of front view 

 resembling a figure of 8; valves elliptical; 

 radii about 60, nearly parallel and transverse; 

 length 1-160"; aquatic. 



C. Clypeus, Ehr. (PL 18. fig. 44). Valves 

 suborbicular, exhibiting a circular and a me- 

 dian transverse hyaline line; radii broad, 

 interrupted in the middle, which is punctate; 

 length 1-200" ; aquatic and fossil. 



BIBL. Smith, Brit. Diat. i. ; Kiitzing, 

 Bacill. and Sp. Alg. 



CAMPYLOSTELIUM, Br. and Sch. A 

 genus of Leptotrichaceous Mosses, including 

 some Dicrana and Grimmice of other au- 

 thors. 



Campylostelium saxicola, Br. and Sch. = 

 Grimmia saxicola, Hook. 



CANADA BALSAM. See BALSAM. 



CANALICULI. See BONE. 



CANCER. We have thought it best to 

 include the consideration of cancer in that of 

 tumours. See TUMOURS, CANCEROUS. 



CANCROID. See TUMOURS, CANCROID. 



CANDONA, Baird (Cfypm, in part MiilL). 

 A genus of Entomostraca, of the order Ostra- 

 coda, and family Cyprididae. 



Char. Two pairs of antennae ; superior 

 long, with numerous joints and a pencil of 

 long filaments ; inferior stout and pediform, 

 without a tuft of long hairs or filaments (see 

 CYPRIS) ; eye single, motion creeping only. 

 Five British species ; aquatic. 



C. reptans (PL 15. fig. 5). Shell ovate- 

 elliptical, slightly sinuate below ; valves 

 rather gibbous in the middle and glabrous, 

 the edges being fringed with rather long 

 hairs ; greenish-white, variegated with marks 

 on the anterior and posterior margins, of a 

 deeper colour at the sides; length about 

 1-10'' (fig. 5 a, inferior antenna). 



BIBL. Baird, Brit. Entomostr. 



CANNA. A genus of Monocotyledonous 

 plants belonging to the same natural family 

 as the arrow-root (Marantacese), and valuable 

 from the same cause. Tous-les-mois is a 

 starch derived from the tubers of a Canna, 

 supposed to be C. edulis, Ker. The grains 

 of genuine Tous-les-mois have distinctive 

 microscopic characters, as shown in PL 36. 

 fig. 25, which is taken from a specimen in 

 the Kew Museum. 



CANTHOCAMPTUS, Baird (Cyclops, 

 pt. Mull.). A genus of Entomostraca, of 

 the order Copepoda, and family Cyclopidae. 



Char. Foot -jaws small, simple; inferior 

 antennae simple ; ovary single. 



Four species ; one aquatic, three marine. 



C. minutus (PL 15. fig. 6). Thorax and 

 abdomen not distinctly separate, consisting of 

 ten segments, successively diminishing in size, 

 the last terminating in two short lobes, from 

 which issue two long filaments, slightly 

 serrate on their edges; antennas short, seven- 

 jointed in the male, nine in the female ; 

 inferior antennas simple, two-jointed, the first 

 joint with a small lateral joint, terminated by 

 four setae ; feet five pairs. 



Common in ditches ; colour reddish ; 

 length about 1-15". (PL 15. fig. 6; a, in- 

 ferior antenna ; b, first pair of foot -jaws ; 

 c, second pair). 



BIBL. Baird, Brit. Entom. 



CAOUTCHOUC. A gum-resinous sub- 



