AMCEB^EA. 



AMPHIMONAS. 



231; Auerbacli, Sieb. and Kb'll. Zeitsch. 

 vii. 365 ; Schultze, Polythal ; Carter, Ann. 

 N. Hist. 1856 and 1804; Wallich, ibid. 

 1863, p. 198 ; Bronn, Thier- Reich, 1880 ; 

 Perty, Z. Kenntn. p. 188 ; Tatem, Mn. Mic. 

 Jn. i. p. 352 ; Lieberkiihn, Ann. N. Hist. 

 1870, vi. p. 497; Greeff, Arch.f. mik. An. 

 ii., & x. 1873, p. 51. 



AMCEB^E'A, Ehr. A family of Rhizo- 

 poda, of the order Lobosa. 



Char. Animals shell-less, composed of a 

 glutinous substance, without integument or 

 internal structure, constantly changing form 

 by the protrusion and retraction of parts of 

 the body, whence result variable expansions ; 

 movement slow. 



They are propagated by spontaneous fis- 

 sion. When cut or torn, each segment 

 contracts upon itself and forms a new being. 

 Spermatozoa have been stated to be formed 

 from the nucleus, and ova formed from the 

 sarcode, by Carter in Amoeba ; Greeff also de- 

 scribes spermatozoa, but these are doubtful. 



Gen. : Amoeba. Pseudopodia of one kind. 



Podostoma. Pseudopodia of two kinds, 

 one large and for locomotion, the other- 

 forming a proboscis, and serving for nutri- 

 tion. 



Petalopm. Pseudopodia cylindrical, ex- 

 panding at the ends into thin plates. 



AMPELOM'YCES, Ces. See OIDIUM. 



AMPHIBLESTKA, Presl. A genus of 

 Polypodiaceous Ferns; now referred to 

 Dictyozyphium and Pteris. Exotic. 



AMPHICAM'PA, Ehr. A doubtful ge- 

 nus of Fossil Diatomaceae. 



A. Eruca (PI. 18. fig. 11). 



A. mirabUis (PI. 18. fig. 12). 



Fossil at Tisar, Mexico. 



BIBL. Ehrenberg, Be>\ d, Berl Ak. 1855, 

 86 ; and Mikrog. 



AMPHIDIN'IUM, Cl. and L. A genus 

 of cilio-flagellate Infusoria. 



A. operculatum (PI. 53. fig. 2). Marine, 

 Norway. 



BIBL. Cl. and Lachm. Infus. p. 410 ; Kent, 

 Inf. p. 461. 



AMPHID'IUM, Nees. A genus of 

 Mosses, included under ZYGODON. 



AMPHILEP'TUS. A genus of Infusoria, 

 of the family Colpodea (Ehr.). 



Eye-spot wanting; no tongue-like pro- 

 cess ; proboscis and tail present. 



The so-called proboscis resembles in ap- 

 pearance a neck. The mouth is situated 

 beneath the junction of the proboscis and 

 the body. 



Dujardin gives the following characters, 



placing the genus among his Paramecina. 

 Body elongated, fusiform or lanceolate, nar- 

 rowed at each end, or at least at the anterior 

 extremity, and furnished with an oblique 

 lateral mouth. 



These animals are usually found in clear 

 marsh water, and in streams, between 

 aquatic plants. They are all furnished with 

 cilia but one ; in some these are arranged in 

 longitudinal rows. Species : 



Amphileptus anser, E. (Dileptus amer, 

 D.). Colourless ; length 1-120". Proboscis 

 obtuse, as long as the body. 



A. margaritifer, E. and D. Colourless ; 

 1-72". Proboscis acute, as long as the 

 body. 



A. moniliger, E. and D. Colourless; 

 proboscis short ; nucleus moniliform ; 1-72 

 to 1-96". 



A. viridis, E. and D. Green ; 1-120 to 

 1-46". 



A. fasciola, E. and D. Colourless ; linear- 

 lanceolate ; 1-720 to 1-144" (PI. 30. f. 10 a, 

 from above ; b, side view). 



A. mekagris (Loxophy Hum mekagris, D.). 

 Colourless ; 1-72" (PL 31. f. 42 a; b, anterior 

 portion in side view). 



A. longicottis, E. Colourless; rounded 

 behind, tapering in front; 1-120 to 1-98". 



A. papillosus, E. Yellowish brown; body 

 covered with papillae ; 1-600 to 1-430". 



A. vorax, D. (Trachelius vorax, E.). 

 Colourless. 



A. ovum, D. (Trachelius ovum, E.). 

 Colourless. 



Claparede and Lachmann describe other 

 species. 



See TRACHELINA. 



BIBL. Ehr. Infusionsth. p. 354 ; Dujardin, 

 Infus. p. : 483; Claparede and Lachmann, 

 Infus. p. 349; Kent, Infus. p. 523. 



AMPHILG'MA (Fr.), Nyl. A genus of 

 Lichens, fam. Lichenacei. 



Char. Thallus white, pulverulent, soft, 

 submembranaceous, containing granula 

 gonima. Hypothallus bluish-black, tomen- 

 tose. 



A. lanuginosum. On shady mossy rocks, 

 frequent. 



BIBL. Leighton, Lich.-Flora, 1879, p. 156. 



AMPHIM'ONAS. A genus of Infusoria, 

 of the family Monadina (Duj.). 



Found in kept saline solutions and marsh 

 water. Species : 



A. dispar. Colourless ; length 1-3860 to 

 1-2700" (PI. 30. fig. 11). 



A. caudata (Bodo saltans ?, Ehr.). Co- 

 lourless ; 1-2180 to 1-1270". 



