1903.] NATURAL SCIENCES OF PHILADELPHIA. 389 



adult arc mainly the following: Two red eyes (E.) are present in all 

 the species except in conklini. No coronal lobes are yet developed, 

 but at the anterior end of the trunk is a thickened hypodermal ring 

 bearing a row of vibratile ciUa. On the ventral side of and just behind 

 this ring is the mouth opening (M.), leading into a capacious infundibu- 

 lum (from which a vestibulum has not yet become demarcated), the 

 inner lining of which bears long cilia. It is important to note that these 

 cilia lie within the alimentary tract, i.e., belong to its inner lining and 

 thus cannot represent a cingulum. The thickened hypodermal ring 

 becomes subsequently prolonged to form the coronal lobes, and the 

 cilia of the infundibulum are at no time a portion of the corona. 

 Above this portion of the alimentary tract lies a large dense mass, part 

 of which may represent the cerebral ganglion (Cer.). The hypodermis 

 of the foot consists of a few enormous cells. A tuft of cilia projects 

 posteriorly from the posterior end of this incipient foot; and in its 

 axis lies a hollow cylinder of cells enclosing a granular, elongate body, 

 which may represent the gland (F.Gl.) which forms the peduncle. The 

 tuft of cilia at the posterior end of this embryonic foot was found, in a 

 somewhat older stage of campamdata which had attached itself and 

 developed a peduncle, to be still present and placed at the junction of 

 the foot and peduncle; in the figure (PL XXI, 38) the cylindrical 

 cellular mass within the foot probably represents embryonic muscle cells 

 of the foot. The remaining organs are essentially as in the adult. 



The 7nature male of F. companulata. — The males of this species 

 were found in November and the first half of December; the male eggs, 

 as in other Rotatoria, are more numerous and smaller than the eggs 

 which give rise to females. The mature male (PL XXI, fig. 36) in 

 size and general structure, disregarding the sexual organs and the ali- 

 mentary tract, shows a great similarity to the immature female. It 

 lacks an alimentary tract entirely, and I was unable to find a nephridial 

 system, though undoubtedly the latter must be present. The thick- 

 ened hypodermal ring at the anterior end of the body bears a single 

 ring of long, vibratile cilia, and in the projection of the trunk anterior 

 to this ring lie two semicircular, dorsal, red eyes (E.). The foot (F.) 

 is very short, without peduncle. The hypodermis (Hyp.) is thickened 

 and with an irrcgurlaly scalloped inner contour. A dorsal sense-organ 

 (D.Sens.O.) is well developed. In the anterior region of the trunk lies 

 a large mass which may in part represent a cerebral ganglion (Cer.). 

 The genital organs consist of a huge sperm sac (Sp.S.) connected with 

 a cirrhus (Cir.). This sperm sac is filled with spermatozoa, and its 

 walls thin except at one point on its dorsal surface which is thickened ; 



