NO. 1 ^:>r'. FRESH- WA TER BR YOZOA—DA VENPOR T. 2 1 5 



&»tabolfcis« 2.— t:CTOF»ROCT>S.. 



Order GVMNOL^EMATA. 



Suborder CTENOSTOMATA. 



IiicliicU's chietiy marine species, but also a iiumlxT of fresh-water 

 g-eiiera. 



Family PALUDICELhIDJ:. 



POTTSIELLA Kraepelin 11887). 



Colony consists of stolons, from which at intervals an erect, cylin- 

 tlrical, hyaline single individual arises, having a terminal aperture. 

 Lophophore circular, 20 (11> to 21) tentacles. 



POTTSIELLA ERECTA Potts (1884). 



PahtdicfUii rn'ftu Potts. 

 J'otlxlelld I'reda Kraepelin, 1887. 



This species possesses the charact(M-s of the g(Muis. (Platv V, tig. 2.) 

 I r< ill! tat. — Photophil; on upper surface of stones in rapids; some- 

 times penetrating incrusting sponges, particularly Meyenia leidy'i. 



I)lxtr!h)(tion. — * Tacony Creek, near Chiltenham, Montgomery 

 Count}', Pennsylvania, 50 feet above tide water. (Potts and C. 1>. D., 

 1892.) 



PALUDICELLA Qervais. 



Stock composed of indi\-iduals that are sharply separated from one 

 another- l)y partitions; sparsely, usuall}^ oppositely, branched; with a 

 chitinous cuticula. The individuals are club-shaped, with a lateral, 

 quadrangular apertur(^ near the larger, distal end. Tentacles arranged 

 in a circle, few in number. No statoblasts, but Avinter buds instead. 



PALUDICELLA EHRENBERGHII van Beneden (1848). 



Aperture-cone short; individuals about 2 mm. long; lateral buds 

 partly repent, partly erect: about Ki tentacles. (Plate Y, lig. 3.) 



ILihitat. — Especially flowing streams; occasionally in water pipes. 



Geographical distrihution. — Europe; India; *Arlington Creek, 

 Arlington. Massachusetts, under railway bridge near Massachusetts 

 avenue (C. B. D., 189»»): ••■■ Bloomsburg, Pennsylvania, l!»00 (Ilartline); 



* Illinois River at Havana, Station G (Thompsons Lake), :May 9, 1891:; 



* Middle Ground, Travers(> Pay, Lake :\Iichigan (Ward, 1896). 



The specimen figured ditVers from a German specimen figured l>y 

 Kraepelin by the individuals being relatively smaller at the distal end. 



