ASPIDULE. 



ASPLENIEJS. 



xiv. p. 238; Derbes and Solier, ibid, p. 268. 

 pi. 33. fig. 11. 



ASPIDIE^E. A subtribe of Polypods-eous 

 Ferns, with indusiate sori. 



I. Cyclodium. Sori globose. Indusium 

 orbiculate, peltate. Veins anastomosing into 

 six-sided spots. 



II. Sagenia. Sori globose. Indusium 

 orbiculate, peltate. Veins anastomosing,, 

 with free venules. 



III. Aspidium. Sori globose. Indusium 

 orbiculate, peltate. Veins pinnate. 



BIBL. See FILICACE^E. 



ASPIDISCA, Ehr. A genus of Infusoria, 

 of the family Aspidiscina. 

 Char. Those of the family. 



^ 1. A. lynceus (P1.23. fig. 15 a, under view). 

 Carapace suborbicular, truncated posteriorly, 

 uncinate anteriorly; aquatic, among Con- 

 ferva, &c. ; length 1-1 100 to 1-560". 



2. A.denticulata (P1.23.fig. 15, side view). 

 Carapace suborbicular, rounded at the ends, 

 truncate and denticulate on the left side ; 

 aquatic ; length 1-560". 



BIBL. Ehrenb.j , In/us. ; Duj., Infusoires-, 

 Stein, Infusionsthiere &c. 



ASPIDISCINA, Ehr. A family of Infu- 

 soria. 



Char. A carapace present in the form of a 

 transparent flattened shield, projecting 

 beyond the mouth in front ; flexible bristles 

 on the ventral surface of the body, with 

 delicate oral cilia. 



Ehrenberg describes an alimentary canal, 

 the inferior orifice of which is alone terminal. 

 Hence they correspond to Euplotes with 

 the excrementitial orifice terminal. 



Dujardin places them among his Coccudinee. 



The setae, styles or cirrhi serve for climb- 

 ing, whilst by the cilia the animals are 

 enabled to swim. 



This family should not be retained, but 

 the single genus of which it is constituted, 

 Aspidisca, referred to the Euplota. 



ASPIDIUM, Schott. A genus of Aspi- 



Fig. 47. 



Aspidium trifoliatum. 



dieac (Polypodaeoui Ferns), in its old sense 



including many of our native species, 

 broken up into subdivisions, now raised to 



Fig. 48. 



Aspidium trifoliatum. 

 Fig. 47. An indusium covering a sorus. 

 Fig. 48. Side view of the same, cut through perpendi- 

 cularly. 



Magnified 25 diameters. 



the rank of genera ; as restricted here it is 

 synonymous with Polystichum. 



ASPLANCHNA, Gosse. A genus of Ro- 

 tatoria, of the family Hydatinsea. 



Char. Foot, intestine and anus absent; 

 eye-spots (1 to 3) and mandibles present ; 

 sexes separate. 



1. A. Brightwellii (Notommata Syrinx, 

 Ehr. ?). Female : jaws with a single tooth ; 

 eye-spot single ; tremulous bodies attached 

 to an extended filament; aquatic; length 

 1-24". Male : jaws, pharynx and stomach 

 absent; body truncate ; length 1-40". 



2. A. priodonta (PL 34. fig. 7, female). 

 3 eye-spots ; tremulous bodies attached to a 

 tortuous filament ; aquatic ; length female 

 1-48", male 1-110"; jaws of female serrated 

 (7 b). 



BIBL. Brightwell, Ann. Nat. Hist. ser. 2. 

 ii. p. 153. pi. 6; Dalrymple, Trans. Royal 

 Soc. 1849, and Ann. Nat. Hist. ser. 2. iii. 

 p. 518; Gosse, Ann. N. H. ser. 2. vi. p. 18, 

 viii. p. 197. 



ASPLENIEJE. A subtribe of Polypo- 

 daeous Ferns with indusiate sori. The fol- 

 lowing genera are indigenous or readily met 

 with cultivated. 



A. Veins pinnate. 



I. Asplenium. Sori not marginal, elon- 

 gated ; indusium elongated, arising from the 

 nerve, free within. 



II. Adiantum. Sori marginal, linear; in- 

 dusium marginal, linear or semilunar, free 

 within. 



III. Cassebeera. Sori marginal, two 

 under each emarginate tooth of the leaf; in- 

 dusium roundish, marginal, covering the pair 

 of sori. 



B. Veins anastomosing. 



IV. Lonchitis. Sori in the incisions of 

 the lobes of the leaf, linear, semilunate ; in- 

 dusium marginal, semilunar, free within. 



V. Doodia. Sori in one or two rows, 

 lunulate or linear, parallel with the rib ; in- 



