OF THE ASTASI^A OR EUGLENiEA . 



543 



awl-shaped and colourless. Within this 

 creatiu'e may often be seen a yello\visli- 

 gi"een mass of granules. The very deli- 

 cate vibrating thread-like filament has 

 its origin from the more projecting side 

 of an indentation on the anterior edge of 

 the body, and is about two-thirds its 

 length. ' This creature has the power of 

 twisting its body into a spiral form, but 

 not of contracting it. It swims freely, 

 and mostly with a vibratory motion, 

 occasioned by the action of the filament. 

 In fresh-water amongst Conferv'se and 

 BacUlaria. 1-480" to 1-120". 



E. triquetra. — Leaf-shaped, three- 

 sided, oval-keeled ; colour green ; tail 

 shorter than the body, and colom-less. 

 Amongst Lemnae. 1-580". 



E. Aciis {Vibrio Acus, JM.). — Slender, 

 spindle-shaped, and straight ; head atte- 

 nuated, and a little truncated -, tail very 

 pointed ; body gTeen in the middle, and 

 colourless at the extremities. This is one 

 of the most beautifid animalcides seen 

 under the microscope ; its graceful form 

 when swimming, its bright-red eye, the 

 curious forms it assumes when stationary, 

 and its remarkable appearance when im- 

 dergoing self-division, all combine to 

 render it worthy of observation. Fresh 

 and brackish water. 1-570" to 1-110". 



E. rostrata. — Elongated and conicail, 

 with the hinder part gradually attenu- 

 ated into a very short tail. Head slightly 



bent, like a beak ; colour gTeen. Amongst 

 OscillatorifB and BaciUai'ia. Length 

 about 1-500". 



E. Ovum. — Ovate, green, with a very 

 short hyaline caudal prolongation, and a 

 large, double, circular nucleus. 1-1560". 

 Berlin. 



E. geniculata (D.). — Green, elongated, 

 cylindrical, flexible but not very con- 

 tractile ; movement slow ; tail tapering, 

 clear, and at an angle with the body — 

 hence the name. 1-208" to 170". This 

 large Euglena is remarkable by its elong- 

 ated form, by its diameter being nearly 

 equal to its length, without the bulging 

 of E. viridis, and by its articulated tail. 



E. ohscura{D.'). — Thick, oblong; dis- 

 tended and obtuse posteriorly; but the 

 fonu very variable ; clearer and of a red 

 tint anteriorly, eye-speck reddish-black ; 

 filament half as long again as the body. 

 1-870". This form Perty sm-mises to be 

 only a deeper-coloured specimen of E. 

 sanguijiea, which he often found of a 

 brown or blackish-red colour. 



E. mucronata (Pertj'). — Of a beautiful 

 green colour, the anterior segment or 

 head frequently hyaline, with a clear-red 

 stigma; tail pointed and transparent. 

 Body oval, often longitudinally and 

 finely striped. Filament overlooked. 

 Difters from E. geniculata by the absence 

 of the angularly-set filament. 1-108" to 

 1-84". 



Mr. Carter describes the following new species from tlie freshwater tanks 

 of Bombay : — 



^. fusiformis. — Short, thick, fusiform, 

 obtuse, of a rich green colour, provided 

 with a long, delicate, single cilium, which 

 projects from a slightly bilabiate anterior 

 extremity; a little behind which is the 

 eye-spot, attached to the contracting 

 vesicle. Nucleus central, situated be- 

 tween the ends of two elongated, refrac- 

 tive, nucleated cells, which extend round 

 the body equatorially. Tailless. Motion 

 during progression oscillatory, and rotat- 

 ing on the longitudinal axis. Length 

 about 1-700", breadth about 1-1100". 

 Freshwater tanks in the island of 

 Bombay. 



E. zonalis. — Short, thick, ovoid cylin- 

 drical, slightly naiTowed anteriorly, of a 

 rich green colour ; provided with a long 

 delicate cilium, which projects from the 

 notch of a slightly bilabiate anterior ex- 

 tremity ; a little behind which is the eye- 

 spot, attached to the contracting vesicle. 



Nucleus central, between the ends of two 

 wide, refractive, nucleated cells, which 

 extend round the body equatorially. Tail 

 adhesive or suctorial (?), short, about 

 one-sixth part of the length of the body. 

 Motion during progression oscillatory 

 and rotating, on the long axis of the body. 

 Length l-llOO",breadth 1-1800". Fresh- 

 water tanks in the island of Bombay. 



These two Euglejice are remarkable for 

 having that refractive cell or organ which 

 I have called the " glair-cell " equatorial, 

 instead of longitudinal as in Euglena 

 Spirogyra, or single and in the anterior 

 lip as in Crumenula tcxta. 



E. agilis. — Is a third species Mr. Carter 

 would distinguish ; but he has given no 

 details, except relative to its develop- 

 ment in the still form. 1-600". In the 

 brackish waters of the marshes of Bombay 

 {A. N. H. 1856, xviii. p. 246). 



Genus CHLOROGONIUM (p. 195) (XYIII. 47 ; XX. \b-21). —Asiasice 



