252 [Aug. 1847. 



pieces, the intermediate pieces are apt to die, and sometimes the 

 extremities do not survive. 



I exhibit a drawing of Phagocata gracilis, from Prof. S. S. Halde- 

 man. 



A drawing of two individuals feeding upon a piece of a Lumbricus. 



Do., representing a ventral surface with the proboscides protruded. 



Do., representing the digestive and generative apparatuses. 



Do., representing five of the proboscides highly magnified. 



Description of two new species of Planaria . 

 By Joseph Leidy, M. D. 



Planaria macvUata. Superiorly convex, faintly blackish or brown- 

 ish with irregular colorless macula? ; inferiorly flat, colorless ; anteriorly 

 trapezoidal; posteriorly spatulate or oval ; eyes two, anterior, proxi- 

 mate, composed of a large semi-transparent mass with a reniform mass 

 of pigmentum nigrum at the postero-internal part ; oral aperture 

 ventral, one-third the length of the body from the posterior extrem- 

 ity; proboscis large and cylindrical. Length 2 5 lines; breadth ^ line. 

 Found in moderate abundance, in the ditches below the city, creeping 

 upon the submerged stems of aquatic plants. 



Subgenus. Prostoma, Duges. Mouth anterior and terminal. 



Prostoma marginatum. Blackish, narrow lanceolate, anteriorly 

 truncate ; marginate, margin delicately striate ; mouth large ; pro- 

 boscis large and oblong ; eyes two, anterior, distant, each consisting 

 of two round masses of pigmentum nigrum in contact with each other, 

 and of which one is larger than the other ; generative orifice one- 

 fourth the length of the body from the posterior extremity. Length 

 1 line. A single specimen found with the preceding ; but probably not 

 rare, for from its small size, it escaped my notice while collecting some 

 of the former, and it was not until I got home that I detected its 

 existence in the vessel of water containing the others. 



The anatomy of P. maculata does not differ from that of Planaria 

 lactea as given by Duges in the Annales des Sciences Naturelles. In 

 Prostoma marginatum the digestive cavity has not the dendritic ar- 

 rangement of Planaria, but merely consists of a large capacious sac 

 extending as far back as the posterior third of the body, and having ;i 

 ccecum upon each side of the proboscis. The penis has a yellow color 

 and consists of a round granular mass, with a moderately long and 

 bent spiculum projecting from its posterior part. The arrangement 

 of a female apparatus I failed to trace. 



Amendments to Articles 7 and 8, of Chap. vii. of the By- 

 laws, proposed by Dr. Bridges, were adopted. 

 These Articles now read as follows : 



