OF THE ASPIDISCIJ^A AND KOLPODEA. 



631 



T. viricUs (Zacri/maria riridis, D.). — 

 Spindle-shaped, neck simple, very mo- 

 bile, long, and dilated at the mouth, 

 which has a ciliated lip. Amongst 

 Lemnse. Length 1-120" ; contracted 

 1-380". 



Perty changes the specific name to 

 ^' li/i(/uifera,^^ and has the very good 

 reason for so doing that the green colour 

 is no distinction, because it is often 

 and, besides various 



changed to bro^^Ti 



or 



intennediate tmts, is at times greyish 

 colourless. Unlike T. Olor, the neck is 

 surmounted by a moveable flap or pro- 



cess, styled a tongue, fringed wdth di- 

 stinct cilia. Pertv speaks of specimens 

 1-72" in length. 



T. biceps. — Spindle-shaped, white ; 

 neck long, forked, each segment with a 

 mouth. 1-190". 



This can have no claim as a species, 

 since it is evidently nothing more than 

 an animalcule in the act of longitudinal 

 fission, not far advanced. 



T. Saf/{Ua= Vibrio Sagitta (M.).— Fu- 

 siform, white ; neck very long ; head ter- 

 minal, opaque, 1-120". North Sea and 

 Baltic. 



FAMILY IX.— ASPIDISCINA. 



(XXV. 321-323.) 



Distingiiislied from the preceding family by the presence of a loriea. The 

 alimentary canal has two orifices, of which the discharging one only is terminal. 

 The loriea is firm, very transparent, and combustible, somewhat resembling 

 the shell (carapace) which covers the back of a tortoise; it projects anteriorly 

 a little beyond the body. Long flexible bristle-like organs attached to the 

 abdomen enable the animalcnles to climb, while the delicate cilia near the 

 month serve both as swimming and purveying organs. Xumerous vacuoles 

 have been filled with coloiu-ed food by Ehrenberg, w^ho has also seen the 

 discharge of matter posteriorly. An oval nucleus and a contractile vesicle 

 occur in both species. Miiller observed self-division, but mistook it for 

 copulation. They are not developed in large masses. 



Genus ASPIDISCA. — Characters as above. 



underneath. Amongst LemnaB and Con- 

 fervffi. 1-1000" to 1-57G". 



AsPiDiscA lynceus {Triclioda hjnceus, 

 M.). — Loriea nearly circular, truncated 

 at the posterior end, and formed into a 

 hook or beak in front. Mouth furnished 

 with very delicate cilia ; five or six 

 bristles (styles) are affixed posteriorly, 

 and fiom five to eight hooks anteriorly, 

 whereby a resemblance to Euphtes and 

 Stylonyclda is established. A contractile 

 vesicle, near the mouth, and twenty 

 vacuoles have been seen. \Vhen burnt 

 upon platina no traces remain. Gene- 

 rally STvims or creeps w^ith its back 



Stein asserts that it is an error to 

 detach this species from Euphtes, T\-ith 

 which it has the closest affinity, and to 

 elevate it to the rank of a family in 

 immediate contiguity with Colpodea, 

 with which it has no natural relation. 



A. denticulata. — Loriea nearly circular, 

 under side truncated and denticidated, 

 fiat ; back arched. The iincini are visible 

 only when climbing, 1-76". 



FAMILY X.~KOLPODEA or COLPODEA. 



(XXIV. 312-316 ; XXY. 325-335 ; XXYI. 23, 32, 33 ; XXYIIL 24-26, 

 31, 33, 34; XXIX. 19, 20, 25-47.) 



Animalcules ciliated throughout ; the cilia disposed in longitudinal series, 

 and either of uniform length throughout, or of larger growth at particular 

 parts, especially about the mouth. Both mouth and anus demonstrable, 

 always lateral, sometimes situated on the same side, at others on opposite 

 sides of the body. 



Except AmiDliUeptus and UroJeptus, the other genera have both the mouth 

 and anus on the ventral surface. In the former genus Lachmann likewise 

 describes the oesophagus to be collapsed, except during the passage of food, 

 when it presents the appearance of a canal. In all other genera of Kolpodea 



