ANELLIDA. 



ANGUILLULA. 



Char. Capsules small, very abundant, 

 forming a copiously branched panicle. 



Several species ; ^mostly from tropical 

 America. 



The fertile fronds, bearing the sporangia, 

 are reduced to mere ribs. 



BIBL. Hook. Sp. Filic. p. 431. 



ANEL'LIDA. See ANNULATA. 



ANEU'RA, Dumortier. A genus of 



Pelliege (Hepati- 

 cse), growing in wet 

 places, containing 

 3 British species. 



A. pinguis, L. 

 Frond irregularly 

 branched, margins 

 sinuate, calyptra 

 smooth, whole 

 plant brownish- 

 green . = J. pinguis, 

 Hooker, Br. Jun- 

 germ. t. 46 (fig. 

 13). 



A. multifda, L. 

 Frond bipinnately 

 divided, calyptra 

 tuberculate. = J. 

 multijida, Hooker, 

 Br. Jungerm. t. 

 45 (figs. 14 and 

 15). 



Fig. 14. 



Fig. 13. 



Aneura pinguis. 

 Bursting sporanges. Magni- 

 fied 2 diameters. 



Fig. 15. 



Aneura multiflda. 

 Fig. 14. Portion of a frond with young perichaetes, 



magnified 20 diameters. 

 Fig. 15. A perichaete, more magnified, cut open to 



show the archegonia. 



A. palmata, Nees. Frond palmate, ca- 

 lyptra tuberculate, J. multifida, var. pal- 

 mata, Hooker. 



BIBL. Hooker, Brit. Jungermannia : 

 Sachs, Sot. 1874, p. 355. 



ANGIOP'TERIS, Hoffmann. A genus 

 of Marattiaceous Ferns. Exotic. 



BIBL. Hooker, Sp. Ftt. p. 440 (pi. 9). 



ANGUIL'LULA, Miiller (Rhabditis, 

 Duj.). A genus of animals, formerly placed 



among the Infusoria, but arranged in the 

 order Nematoidea of the class Entozoa by 

 modern zoologists. The popularly known 

 " eels " in vinegar and paste belong to this 

 genus. 



Char. Body filiform, narrowed at the 

 ends; mouth terminal, round, naked; anus 

 subterminal ; tail of male either naked or 

 furnished with a membrane (winged); a 

 double spiculum; tail of female conical, 

 acute. Mouth succeeded by an oblong ca- 

 vity (pharynx) ; stomach top-shaped or 

 spherical, furnished with a kind of dental 

 armature. Tail of the female frequently 

 prolonged into a fine point. Uterus bifid ; 

 vulva situated near the posterior third of 

 the body. Oviparous or viviparous. 



These animals are especially remarkable 

 and interesting on account of their great 

 tenacity of life ; resembling in this respect 

 the Tardigrada and Rotatoria. Thus Ang. 

 flumalilis, when existing in places exposed 

 to the heat of the sun, will dry up and be- 

 come hard and brittle. But as soon as re- 

 moistened by rain, it revives, swells up, be- 

 comes soft, takes food and exercises its re- 

 productive functions as before. The same 

 faculty is possessed to an extraordinary de- 

 gree by Ang. tritici, which will revive after 

 having been kept in a dry state for more 

 than five years. Nor are they destroyed by 

 being frozen. 



Ang.fiuviatilis (?) (Ang. terrestris, Duj.) 

 (PI. 21. fig. 4). White, about 15 times 

 as long as broad ; oesophagus fusiform, ex- 

 panded posteriorly so as to become continu- 

 ous with the much larger stomach; length 

 of male 1-50 to 1-12". 



Found in wet moss and moist earth,whence 

 it gets washed into rivers and ditches; 

 sometimes also in the intestinal canal of 

 snails, frogs, fishes, worms, and insects. 



Ang. aceti (PL 21. fig. 5). From 30 to 

 45 times as long as broad, narrowed poste- 

 riorly and terminated by a drawn-out point ; 

 ossophagus cylindrical; tail conical. pointed: 

 length 1-30 to 1-17". 



This species was formerly very common 

 in vinegar, and the " eels in vinegar " were 

 favourite popular microscopic objects. To 

 the freedom of our vinegar from mucilage, 

 and the addition of sulphuric acid allowed 

 by law, must be attributed their compara- 

 tive rarity in the present day. Still, if to 

 cheap vinegar, in which a few may be per- 

 ceived by a hand-lens, a little flour be added, 

 they m&y be bred in swarms. 



Ang. tritici (PI. 21. fig. 6). 20 times as 



