SUCTORIA 703 



spherical; stalk short; tentacles in 2-5 bundles; macronucleiis spheri- 

 cal; 1-2 contractile vacuoles; about 50/x long; on Cyclops, etc. 



Genus Thecacineta Collin. Lorica with free margin; body usually 

 attached to bottom of lorica, more or less long; tentacles from an- 

 terior end; salt water. Several species. 



T. cothurnioides C. (Fig. 331, a). Lorica about 50^ high; stalk 

 knobbed; on Cletodes longicaudatus. 



T. gracilis (Wailes) (Fig. 331, h). Lorica 110/x by 35^; stalk 200^ by 

 4/i;onhydrozoans. 



Genus Periacineta Collin. Elongate lorica; attached with its 

 drawn-out posterior end; tentacles from the opposite surface in 

 bundles; fresh water. 



P. huckei (Kent) (Fig. 331, c). Attached end of lorica with basal 

 plate; 3 contractile vacuoles; up to 125/1 long; on Lymnaea stagnalis 

 and Ranatra linearis. 



Genus Hallezia Sand. Without lorica; with or without a short 

 stalk; tentacles in bundles; fresh water. 



H. brachypoda (Stokes) (Fig. 331, c?). 34-42/i in diameter; in stand- 

 ing water among leaves. 



Genus Solenophrya Claparede and Lachmann. Lorica attached di- 

 rectly with its under side; body usually not filling lorica; tentacles in 

 fascicles; fresh water. 



S. inclusa Stokes (Fig. 331, e). Lorica subspherical; about 44/x in 

 diameter; standing fresh water. 



S. pera S. (Fig. 331, /). Lorica satchel-form; about 40-45At high; 

 body about 35m long; standing fresh water. 



Genus Acinetopsis Robin. Lorica in close contact with body on 

 sides; stalked; 1-6 large retractile tentacles and numerous small 

 tentacles from apical end; mainly salt water. 



A. tentaculata Root (Fig. 331, g, h). Lorica 187/x high; stalk 287)u 

 long; large tentacles up to SOO/x long; body about 138/x by lOO/i; on 

 Obelia commissuralis and 0. geniculata; Woods Hole. 



Genus Tachyblaston Martin. Lorica with short stalk; tentacles 

 distributed on anterior surface; nucleus oval; salt water. One species. 



T. ephelotensis M. (Fig. 331, i, j). Lorica 30-93^ high; stalk 20-30/x 

 long; attached to Ephelota gemmipara. 



Genus Dactylophrya Collin. Cup-like lorica, filled with the proto- 

 plasmic body; with a short stalk; 12-15 arm-like tentacles from an- 

 terior surface; salt water. One species. 



D. roscovita C. (Fig. 331, fc). About 40^ long excluding stalk; on the 

 hydrozoan, Diphasia attenuata. 



Genus Pseudogemma Collin. Attached with a short stalk to larger 



