DACTYLOCOCCUS. 



[ 235 ] 



DAPHNELLA. 



15o. 



occurrence : it grows upon the surface of 

 the membrane within the shell of the eggs 

 of fowls and oth(>r birds. It 

 does not appear to have been 

 observed in this country ; but 

 several foreign writers have 

 investigated it ; and from the 

 experiments made by Spring 

 and Wittich, it appears that 

 the spores pass through ori- 

 fices existing in the shell, and 

 germinate in the interior, 

 often in the air-chamber. A 

 full account of this plant, and 

 of the literature, is given by 

 Ch. liobiu. Many of the 

 species are undoubtedly coni-jj^p^yu^j,^^ ^t^^^^ 

 diiferous forms of SphcericB a fertile flla- 

 (Tulasue, Carpoloqia). See ment with septate 

 Dexdryphium and nELJiiN-«i;°;;-;^^^^_i'°'' its 



THOSPORir JI. British spe-Magn.200 diams. 



cies : 



D. pyriforme, Fr. On mouldering stems 

 of herbaceous plants. 



Z>. macyosporum, Fr. On rotton wood, 

 leaves, and fungi. 



D. dendroides, Fr. On decaying agarics, 

 &c. Very common. Grev. Sc. Crypt. Fl. 

 pi. 12G. fig. 1. 



D. obovatum, Berk. On willow twigs, in 

 damp. Aim. Nat. Hist. vi. pi. 14. fig. 26. 



D. s])hcerocephalum, Berk. On dead ivy- 

 twigs, I. c. fig. 27. 



D. teiuUum, Fr. On moss. 

 BiBL. Berk, in Hook. Brit. Fl. v. pt. 2. 

 345 ; A7in. N. H. tit supra ; Berk, and 

 Broome, Ann. N. II. 2 ser, vii. 102 ; Robin, 

 Parasites, 2nd ed. 543, pi. 2. figs. 5 & 6 ; 

 Fries, Syst. Myc. iii. 414 ; Summa Veget. 

 491. 



DACTYLOCOCCUS, Nag.— A genus of 

 PalmeUaceous iilgie, allied to Cliaracium 

 and Ilydrianum. 



Char. Cells oblong or fusiform, free, 2-8 

 together, then separating. Two species, 

 one green ; among other Algce, or on the 

 side of pools ; about 1-2500" long. 



BrBL. Nageli, Einz. Aly,- p. 80 ; Eaben- 

 horst, Fl. Ah/, iii. p. 46 (fig.). 



DACTYLOP'ORA, Lam.— Regarded by 

 some as one of the Foraminifera imper- 

 forata ; but by others as belonging to the 

 calciferous Algas. The simplest fi)rm pre- 

 sents a set of sac-like chambers, side by 

 side, for a part or the whole of a circle, 

 with their mouths in one direction along 

 the inner median line. Various modifica- 

 tions lead to the structure of a cylinder of 



such rings, with interspaces, thickened 

 walls, and subsidiary cavities. The simple 

 forms (Z>. eruca, PI. 23. f. 53) live in the 

 tropical seas. The more complicated species 

 are of Tertiary age in France, Italy, and 

 San Domingo ; D. reticulata (PI. 23. f. 54) 

 is one of these. 



BiBL. Parker and Jones, Ann. N. II. 

 ser. 3. 473; Carpenter, For. 127;Gumbel, 

 Ahh.bay. AJcad. 1872. 



DACTYL'OPUS, Clans.— A genus of 

 Entomostraca, order Copepoda. 

 I), tishoides. Marine. 

 BiEL. Claus, Copepod. 127 ; Brady, Trans. 

 North umherland. 



DALTO'NIA,Hook. andTayl.— A genus 

 of Pleurocarpous Mosses, the species given 

 being restored here on account of the struc- 

 ture of the leaf ; while D, heteromalla of 

 Hooker goes to Ilypnum on the same 

 ground. 



D. splanchnoides, Hook. andT. = IIookeria 

 splanch. Hook. 



DAM^'US, Koch. See Belba. 

 DAM'MARA-" 6^M?»."— The resin of 

 Dammar a australis, N. O. Piuacese. It is 

 often used, dissolved in benzole, as a 

 varnish ; and as it dries quickly, it is useful. 

 It is also largely used as a substitute for 

 Canada balsam ; but we prefer the latter. 

 DAN^'A, Smith.— A genus of Marat- 



Fig. 156. 



Dausa. 

 Part of a pinnule with so;i. 

 Magnified. 5 diameters. 



tiaceous Ferns,' whence thefamilv is some- 

 times called also Danseaceae. Tropical Ame- 

 rica. 



12 species. 



BiBL. Hooker and Baker, Syn. 442. 



DAPH'NE, L. See Thymeleace^. 



DAPHNEL'LA, Baird.— A genus of 

 Entomostraca, of the order Cladocera, and 

 family Daphniadre. 



Char. Inferior antennse very large, pos- 

 terior branch two-jointed only. 



