ANTROPHIUM. 



[ 51 ] 



APHANIZOMENON. 



together, by the points of the hooks in one 

 half being inserted into little depressions 

 between the teeth of the opposite side ; 

 sometimes these are furnished with a tooth 

 below the apex (fig. 28 c). 



This description of the structure of this 

 interesting organ does not appear to be 

 correct. We believe that the older view, re- 

 garding each half of the Antlia to contain a 

 distinct canal, to be true; and that the trans- 

 verse rings, in fact the entire frame-work of 

 the organ, consists of chitine. But the subject 

 requires further investigation. The only 

 muscular structure we have detected in the 

 organ, consists of bundles of muscular fibres 

 taking an oblique longitudinal direction. 



BIBL. Newport, Todd's Cycl. of Anat. 

 and Phys. ii. p. 901. See also INSECTS. 



ANTROPHIUM, 

 Kaulf. A genus of 

 Gymnogrammeae (Po- 

 lypodaeous Ferns), 

 with the sori imbedded 

 in a kind of groove 

 along the backs of the 

 veins. Exotic. 



The annexed magni- 

 fied figure (fig. 27) re- 

 presents part of a sorus 

 with some of the theca 

 or sporanges in situ, 

 having the perpendi- 

 cular annulus charac- 

 teristic of this family. 



Fig. 27. 



Antrophium Lessoni. 



Part of a sorus. 



Magnified. 



ANUR^EA, Ehr. A genus of Rotatoria, 

 of the family Brachionaea. 



Char. A single (red) eye-spot at the back 

 of the head, no foot or pediform tail. 



In seven species the back of the carapace 

 is furnished with facets, in four with longi- 

 tudinal striae, in three it is smooth; in 

 thirteen it is furnished with teeth or spines 

 in front, in seven also behind. One species, 

 A. biremis, has two moveable spines on each 

 side. 



Dujardin gives the following characters. 

 Carapace in the form of a depressed utricle 

 or sac, toothed in front and with a wide 

 orifice to allow of the protrusion of the rota- 

 tory organs, which are usually well developed 

 in the form of two rounded lobes, accompa- 

 nied with setae or non-vibratile cilia in several 

 bundles ; no tail ; jaws digitate ; a red eye- 

 spot above the jaws ; ova voluminous, often 

 adherent to the parent. 



The species are both aquatic and marine, 

 and many of them are common in pure fresh 

 water; length from 1-240 to 1-120". 



1. A. quadridentata, E. 



2. A. squamula, E. 



3. A.falculata, E. 



4. A. curvicornis, E. (PI. 34. fig. 5, viewed 

 from above ; fig. 6, side view). 



5. A. biremis, E. 



6. A. striata, E. 

 7- A. inermis, E. 



8. A. acuminata, E. 



9. A.foliacea, E. 



10. A. stipitata, E. 



11. A. testudo, E. 



12. A. serrulata, E. 



13. A. aculeata, E. 



14. A. valga, E. 



To these Mr. Gosse adds, A.jissa, A. tecta, 

 A. brevispina and A. cochlearis. 



BIBL. Ehr. In/us.-, Duj. Infus.; Gosse, 

 Ann. Nat. Hist. 1851, viii. p. 202. 



ANYSTIS, Heyd. (Erythraws, Duges; 

 Trombidium, Herm.). A genus of Arachnida, 

 of the order Acarina, and family Trombidina. 



Char. Palpi large, free, bi-unguiculate (?); 

 mandibles unguiculate ; body entire ; legs at 

 their insertion contiguous, cursorial, i. e. 

 unguiculate, long, the last joint slender and 

 very long ; posterior legs the longest. 



1. A. parietinum. Colour vermilion ; palpi 

 with a single claw, mucronate below. Found 

 between stones and in moss ; and on book- 

 shelves. Tromb. parietinum, Herm. Mem. 

 Apterol.ip.37.pl. 1. f. 12. 



2. A. ruricola. On stones and on dry 

 paths. (PI. 2. fig. 3.) 



3. A.flava (Tr.flavum). 



4. A. ignipes. 



5. A. cursoria. 



6. A. cornigera. 



BIBL. Hermann, Mm. Apterol.\ Duges, 

 Ann. d. Sc. nat. 2 ser. i. and ii. ; Koch, 

 Deutsch. Crust. &c. ; Hey den, Isis, 160; 

 Gervais, Walckenaer's Hist. d. Insectes, iii. 



APHANIZOMENON, Morren (Limno- 

 chlide, Kiitzing). A genus of Nostochineae 

 (Confervoid Algae) forming a delicate bluish 

 mucous stratum on the surface of lakes or 

 standing water. The filaments are very 

 slender, flaccid and obscurely jointed. No 

 vesicular cells have been detected ; the sper- 

 matic cells are much elongated, either 

 scattered or, more frequently, solitary near 

 the centre of the filament. Ralfs states that 

 he is not disposed to place much dependence 

 on the character of coherence in flat lamellae, 

 since he could not detect it in A. cyaneum. 

 which does not appear to differ generically 

 in other respects. This genus seems to form 

 a connecting link between the Oscillatorieae 



E2 



