ANEIMIA. 



C 34 ] 



ANGUILLULA. 



Fig. 12. 



ANEIMIA, 

 Swartz. A 

 genus of Schi- 

 zaeous Ferns. 

 Exotic (fig. 

 12). 



The fertile 

 fronds, bear- 

 ing the spo- 

 rangia, are re- 



r!nr>prl fn rnprp Aneimia mandioccana. 



duced to mere Group of sporanges bursting to dis- 



riDS. charge the spores. Magnified. 



ANELLIDA. See ANNULATA. 



ANEURA, Du- 



mortier. A genus 

 of frondose Liver- 

 worts (see Pellieae), 

 growing in wet 

 places, containing 

 three British spe- 

 cies : 



1. A. pinguis, 

 L. Frond irregu- 

 larly branched, 

 margins sinuate, 

 calyptra smooth, 

 whole plant brown- 

 ish - green. = J. 

 pinguis, Hooker, 

 Br. Jungerm. t. 

 46 (fig. 13). 



Fig. 13. 



Aneura pinguis. 



2. A. multifida, Bursting sporanges. Nat. size. 

 L. Frond bipinnately divided, calyptra tu- 

 berculate. = J. multifida, Hooker, Br. Jun- 

 germ. t. 45 (figs. 14 and 15). 



Fig. 14. 



Fig. 15. 



Aneura multifida. 



Fig. 14. Portion of a frond with young perichsetes, mag- 

 nified 20 diameters. 



Fig. 15. A perichsete, more magnified, cut open to show 

 the archegonia. 



3. A. palmata, Nees. Frond palmate, 

 calyptra tuberculate. = J. multifida, var. 

 palmata, Hooker. 



BIBL. Hooker, Brit. Jungermannia. 



ANGIOPTERIS, Hoffmann. A genus of 

 Marattiaceous Ferns. Exotic. 



ANGUILLULA, 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 the male either naked 

 or furnished with a membrane (winged) ; a 

 double spiculum ; tail of the female conical, 

 acute. The mouth is succeeded by an oblong 

 cavity (pharynx), which is furnished with 

 two or three longitudinal bacilli and is distinct 

 from the oesophagus, which is muscular and 

 fusiform or cylindrical ; stomach top-shaped 

 or spherical, furnished with a kind of dental 

 armature. The tail of the female is frequently 

 prolonged into a fine point. The uterus is 

 bifid, and the vulva situated near the poste- 

 rior third of the body. 



These animals are especially remarkable 

 and interesting on account of their great 

 tenacity of life ; resembling in this respect 

 the Tardigrada and Rotatoria. 



Thus, Aug. fluviatilis, when existing in 

 places exposed to the heat of the sun, will 

 dry up and become hard and brittle. But 

 as soon as remoistened by rain, it revives, 

 swells up, becomes soft, takes food and 

 exercises its reproductive functions as before. 

 The same faculty is possessed to an extra- 

 ordinary degree 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. 



Dujardin admits three species : 



1. Ang. Jluviatilis (?) (Ang. terrestris, 

 Duj.) (P1.16.fig>.4). White,about fifteen times 

 as long as broad ; oesophagus fusiform, 

 expanded posteriorly so as to become conti- 

 nuous with the much larger stomach; length 

 of male 1-50 to 1-J2". 



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. 



2. Ang. aceti (PI. 16. fig. 5). From 30 to 

 45 times as long as broad, narrowed poste- 

 riorly and terminated by a drawn-out point ; 

 oesophagus 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 oil of vitriol (sulphuric 

 acid) allowed by law, must be attributed 

 their absence in the present day. 



