PLANARIA. 101 



PLATE XV. 



FIG. J . Supposed larvse of tho Planaria cornuta from the spawn. 

 2. Lame farther advanced. 

 8. Empty capsules. 



Note. The preceding is the only species of Planaria known to me 

 with large and distinct horns towards the front of the head. But a num- 

 ber of years ago another occurred, to which I shall be content with a 

 general aEusion, having been unable to resume my littoral researches 

 when most likely to be successful, and that also was horned. 



Length about eight lines ; extreme breadth three ; body thin, flat- 

 tened, dingy yellow, and, on the whole, much resembling the Planaria 

 /fi-j'ilix, both in aspect and motions. Two very short obtuse white horns, 

 projecting not the fourth of a line, rose perpendicularly from the upper 

 surface, in nearly the same position occupied by the ocular specks 

 of the flex'disi and on the interior of the root of each horn, were 

 eight or ten minute specks, disposed irregularly. Spawn, consisting of 

 spherical ova or capsules, was deposited in September. When farther 

 advanced, each capsule seemed to consist of four compartments. 



Whether this was a specimen disfigured by some monstrosity, or 

 whether the organs were natural, I cannot presume to determine. The 

 artist had no hesitation regarding its form. 



PLATE XIV. 



FIG. 5. Planaria (corniculata), back. 



6. Belly. 



7. Spawn. 



8. Portion of the same, enlarged. 



/;. PLAXARIA ELLIPSIS. Plate XIV. Figs. 9, 10, 11, 12, 13, 14, 15, 16. 



As many of the lower animals gain an important accession of parts 

 with age, I mistook this species for a long time as the young of the Pla- 

 nar ia conuda. Further experience proved their difference. 



Length four or five lines, or somewhat more ; breadth half an inch ; 



