OF THE irONADnfA. 



501 



fiingus, and been named by Kiitzing Stereonenm. Upon this view, the 

 monadiform beings crowning the summits of the branches have been con- 

 ceived to represent the spores. This opinion has been carefully investigated 

 and rejected by Cohn (Entwich. d. ynilcroskop. Algen u. Pilze, pp. 11-J— 115), 

 who confirms Dujardin's description, and regards it as a stalked Uvella. 



Anthophysa Mulleri. — With the 

 characters descril«d. 



A. soUtaria (Borv'). — A species was 

 described under thisname by Bory de St. 

 Vincent, and is again brought to notice 

 by Fresenius, who met with it in some 

 standing water -wath Salvinia. The 

 stem is simple (not branched), and has 

 a clear outline to its extremity. Its 

 length is from 1-25 to 1-8 millim. ; and 

 in water it has a clear brownish-green 

 colom'. Its apex is surmounted by the 



monadiform beings, looking like so many 

 short hyaline fibres. Each monad con- 

 tains a comparatively large non-con- 

 tractile vacuole having a red refraction, 

 and is furnished with a filament at its 

 free extremity. Length of monads 

 1-100 to 1-75 millim. The fixed stem 

 can bend itself from side to side. In 

 one specimen a contractile vesicle was 

 seen in one of the monads. This organism 

 appears to be precisely the same as the 

 Epistylis Botrytis (Ehr.), 



Genus PEBOMUM (Cohn), represented by one species. 



Peronium aciculare has been newly 

 described by Cohn (JEntwick. &c. p. 158) 

 as a form aUied to Anthophysa. It is 

 parasitic on the spores of JPihtlaria, and 



consists of a delicate colomless fibre sur- 

 mounted by a globular head, which re- 

 solves itself into numerous swarm-ceUs 

 of a monadifonn character. 



The two next genera are named by Werneck {Monatshericht der Berlin. 

 Ahad. 1841, p. 377), and thus briefly described : — 



Genus ANCYRIUM = Enterodelous Bodos {i.e., according to the nomen- 

 clature of Ehrenberg, Bodos furnished with an intestinal tube) with a 

 moveable setaceous foot. 



The existence of an alimentary tube (so supposed) removes the Bo do 

 gi'andis and the six allied species (^. e. the genus Ancyrium) far above the 

 Monadina of Ehrenberg, whilst the possession of the setaceous foot also indi- 

 cates a higher organization. 



Genus EBETES = Loricated Phacelomonads. 



The following are the new genera of Monadina instituted by Perty : — 

 Genus TETBAMITUS (Perty) (XIX. 3).— Figui-e conical, tapering pos- 

 teriorly, and having four vibratory filaments in front. He.vamita differs in 

 having in addition two posterior filaments. 



Tetramitus descissus (xix. 3). — 

 Wedge-shaped, curved, truncate ante- 

 riorly, and colom-less or pale gi'ey. Sur- 

 face marked bv cross-lines. Movements 



prominent angle or beak. Smallest 

 specimens 1-7000", the largest 1-1080" 

 in length. Bern. In stale pond-water. 

 Fresenius describes it as rather pp-ifonn, 

 trimcate anteriorly, with a short trunk- 

 like process from one side ; elongated and 

 pointed behind. A vesicle (contractile ?) 

 at the anterior extremity. 



tolerably active and oscillating. Fila- 

 ments nearlv twice the length of the 

 body. 1-1860". 



T. rostratus. — Colourless, with an an- 

 terior border j one side elongated as a 



Genus MALLOMOI^AS (Perty) (XIX. 4-6).— Body oval, eUiptic, or discoid, 

 with brown or greenish contents. Surface covered with long motionless 

 hairs. A single filament anteriorly, double the length of the body. 



of the hairs ; these are commonly 

 longer on the posterior half. Contents 

 sometimes seen longitudinally or trans- 

 versely divided. Movements rather 

 rapid, but rarely attended by a rotation 

 of the body. In one example the hairs 



Mallomonas Plosslu (xix. 4-6) 

 (formerly described as 3f. acaroides). — 

 Mostly oval ; the smaller end anterior ; 

 rarely elliptic or discoid ; the periphery 

 apparently crenulated — an appearance 

 probably due to the points of insertion 



