52 BULLETIN OF THE MUSEUM OF COMPARATIVE ZOOLOGY. 



EXPLANATION OF THE PLATE. 



Fig. 1. Slylochoplana cali/ornica, from specimen cleared in glycerin to show tlie 

 habit. X 22. 6«., bursa ; im., lateral branches of the intestine ; o., mouth; 

 pe., penis; phy., pharynx; «., tentacles ; ^,male gonopore ; 9.f<^™'ile 

 gonopore. 



Fig. 2. Enlarged drawing of the brain to sliow the arrangement of the eye-spots and 

 their relation to the tentacles and cerebral nerves. 



Fig. 3. ProstheceroMs panamensis. Anterior end showing the cerebral eye-mass and 

 tentacular eye-spots. X 27. Owing to the condition of the specimen the 

 anterior margin of the body appears turned under, looking as if the ten- 

 tacles sprang from the ventral surface of the animal. 



Fig. 4. Rhabditi and Pseudorhabditi of the same species, from a bit of teased 

 hypodermis. X 760. 



