l68 RKSP:ARCHKS in HKLMINTHOr.OCV AND I'AR ASITOLOGV. 



appeared to be different from those previoush- described. It is of 

 frequent occurrence, attached to the tubes of Plumatella, Urnatella, 

 and Cordylophora, on stones in the Schuylkill River below Fair- 

 mount dam. In shape it resembles Pyxicola pussi/Ia and P. affinis, 

 fresh-water forms of England, but is annulate, as in /'. socialis, a 

 salt-water form. It is represented in Figs. 8 and 9, pi. II, and pre- 

 sents the following characters : (Drawing.) 



Pyxicola Anniilata. — Lorico urceolate, slightly curved, inflated 

 toward the middle, tapering below, cylindrical and feebly con- 

 tracted at the neck, and with the aperture oblique and circular ; 

 variably annulate, mostly at the neck, often at the middle ; color, 

 chestnut brown, but colorless when young. Pedicle short, always 

 colorless. The contained animalcule is of the usual shape, with an 

 attached operculum, which is of the same color as the lorica and is 

 protruded beyond this when the animal is fully extended. Length 

 of lorica 0.52 to 0792 mm.; breadth 0.02 to 0.0264 inm.; length of 

 pedicle .004 to .008 mm. 



[October. 1882. Nos. 502 and 504. See Bibliography.] 



.IttinosphcFriHvi Eichhornii. — Prof. Leid}' remarked that he had 

 noticed in an aquarium what appeared to be eggs adherent to the 

 edges of the leaves of Vallisneria from the Schuylkill River. On 

 examining the egg-like bodies with a lens they were observed to be 

 covered with delicate rays. On transferring some of the bodies to 

 the field of the microscope, they proved to be giant specimens of the 

 larger sun-animalcule, Actinosp/urriiDii eichhornii. They measured 

 from three-fourths to one millimeter in diameter independent of the 

 rays, which extended from one-fourth to half a millimeter more. 

 One of the smaller individuals contained four water-fleas, Daphnias, 

 a third of a millimeter long, and one of the larger contained six of 

 these. The Actinosphceriuvi appears to be tenacious of life, several 

 specimens having been retained alive and in good condition for three 

 daj'S in a drop of water in an animalcule cage. They had dis- 

 charged the Daphnias, but retained their original size. One of oval 

 form measured i mm. long by 0.75 mm. broad. The smaller ones 

 measured 0.75 mm. in diameter. After another day they appeared 

 in good condition, but the rays were contracted so as to be about 

 half the original length, and many had a minute granular ball at 

 the end, apparently effete matter thrown off from them. At this 

 time the animalcules were returned to the aquarium. 



