574 Dritter Abschnitt. Systematik. 



7) »This is the largest of tlie Scotish Planaria, oue specimen having occurrcd fifteeii liiies long, nearly 

 half as much in breadth, a Hne thick, and of a fine ruddy orange hne. Biit specimens only two-thirds of 

 its size are the usual dimensions of fuU-grown adults. — The llorned Planaria is of an oval shape , coni- 

 paratively thin and flat, the posterior part rounded, the anterior or head peaked , with two stout obtuse 

 liorus, tending to a triangulär form, rising from the back of the neck. At the root of , and partly asceu- 

 ding each hörn, are several black specks, togcthcr with a few more somewhat bejiind them. Both sets 

 Vary in uumbers and distribution in different specimens, a remark applicable to niost of the soft-bodied 

 animals, where specks are present. A milk-white strong cartilaginous cylindrical proboscis, directed down- 

 wards, issues from the anterior part of the under surface; and at some distance further down is seen the 

 stomach, distributing its numerous coeca to the very margin of the body. Finer specimens are speckled 

 red above — paler below. Many are of piain, uniform, cream yellow. But the colour depends greatly on 

 the nature of the food, by whicli the aspect of the animal is entirely changed. Most of those vividly 

 speckled when taken from the sea, become quite pale on protracted confinement. — It is only on repletion 

 with food of peculiar quality, that the beautiful interanea can be discovered. Nor is it easy to describe 



the difficulty of representing them accurately, from the size, motion, and opacity of the subject 



Their horns may be computed at a sixteenth of the length of the body, perhaps elongating more in pro- 

 portion to the increase of size. It is doubtfnll whether their office is in any respect tentacular, because 

 they are always carried upright, or inclinc a little when the animal is in motion. — But this is a sluggish 

 inactive creature, unless when stimulated by heat or hunger. It is very impatient of any, unless the gent- 

 lest, augmentation of teraperature. — The body is smooth; it is protected from abrasion by a glutinous 

 secretion, which, perhaps, is also instrumental in its agglutination to the same spot, should it remain long 

 motionless. AU the Planariae feed on animal substance, and many eat voraciously. The natural habitation 

 of the Horned Planaria is at the depth of some fathoms in tlie sea. On confinement, a shell or stone should 

 be provided for its retreat, as it is induced by the smoothness of a glass vessel to crawl so far above the 

 surface of the water, that the glutinous matter is exhausted, when it becomes incapable of returniug and 

 perishes. Also if the vessel be brimful, it glides over the edge. — The regenerative properties of the 

 animal are great. Desperate wounds and lacerations heal speedily. It survives extraordiiiary niutilations 

 whether accidental or experimental. A specimen having lost the head and horns, together with much of 

 the anterior portion of the body, recovered the whole. This animal was of considcrable size and of varie- 

 gated colour origiually, but the renovated parts were pale, and the horns small. The cartilaginous proboscis 

 of another, after Separation, the effect of some injury, testified vitality during three or four days. It would 

 appear that the peculiar texture of this organ is adverse to its indissoluble union with this softer, more 

 gelatinous, and perishable substance of the body.« 



Folgen Beobachtungen über Eiablage, Larven. 



»Tlie size and vigour of the parent decline after spawning, and the colour fades to dingy white. — 

 The Horned Planaria lurks in the crevices of empty shells ; or, for the most part, lies buried in mud, when 

 recovered from the sea; whence it may be dislodged by imparting some iiupurity to the water. Specimens 

 survive readily for a considerable time. Between forty and fifty have afforded the substance of the ])rece- 

 ding observations.« 



S' »It lurks in the crevices of empty shells; or, usually, lies buried in mud. Bcrwick Bay. 



Dr. JOHXSTON.O 



9) Fundort; »Firman Bay. Islands of Guernsey.« 



10) Nimmt in die Synonymie von Eurylepta auch Proceros sanguinolentus Quatrefages auf Be- 

 schreibung seiner E. cornuta. 



Körper elliptisch, dick, von röthlich-oranger Farbe und fein weiss gefleckt von durchschimmernden 

 Eierkapseln. Die lancettfürmigen Pseudotcntakeln durch einen kleinen Stirnrand von einander getrennt. 

 Gehirn sehr klein. Augen zahlreich, klein, in zwei langen, nach hinten etwas divcrgirenden, dicht vor dem 

 Gehirn zusammenstossenden Haufen. Ausserdem zahlreiche Augen an der Bauchseite des Stirnrandes 

 und der meistens nach oben gekehrten Bauchseite der Pseudotentakeln. — Gleich hinter dem Gehirn 

 der kräftige, in einer ovalen Rüsseltasche eingeschlossene, weiss aussehende Rüssel. Dahinter etwa in 

 der Mitte der Ki>ri)f'rliingr die niiinnliche Geschlechtsöff'nung 'mir nur durch den Zii])fi'nfiirnngen Penis 



