208 DESCRIPTION OF {^Polygastrica. 



gatious on the lorica, which Ehrenberg does not appear to have 

 seen. Found among Oscillatoria, &c. Size 1 -240th. 



DrFFLUGiA oblonga. — Shell oblong, rounded, smooth, and of a 

 bro-v\Tiish colour. The transparent processes fewer and stouter than 

 those of the preceding species. Found among Oscillatoria, &c. 

 Length 1 -200th. 



D. actmiinata. — Shell oblong and rough, being covered with mi- 

 nute grains of sand ; posteriorly pointed ; processes transparent. 

 Length l-70th. 



D. enchelys. — Shell oval ; coloiu'less ; transparent and smooth, 

 rounded on the back ; processes transparent, slender and small ; 

 aperture lateral. This is the smallest species of the genus. Size 

 l-550th. Foxind in stagnant water. 



D. ampulla. — Lorica oblong, club-shaped, elegantly marked by an 

 oblique series of dots fpunctaj : hyaline, with an ovate opening. 

 Size 1 -680th. Foimd by Dr. Werneck at Salzburg. 



D. spiralis, (Bailey). — Lorica sub-globose, minutely granulated : 

 upper surface unequal, with a spiral suture of two or three turns. 

 Pseudopodia, (variable processes) long, numerous, constantly changing 

 positions, hyaline. Size 1-6 80th. Found at Berlin, and common in 

 the United States. 



D. acanthophora. — Lorica ovate, oblong, areolated, loosely foramen 

 dentated, armed posteriorly with three or four spines (^aculeij. 



D. a/reolata. — Lorica and foi'amen, as in the preceding, but the 

 spines deficient. 



D. denticulata. — Lorica ovate, oblong, smooth, foramen (mouth or 

 ostiola) with twelve dentations, 



D. lacjcna. — Lorica clavate, of the form of a bottle, smooth, with- 

 out reticulations, margin of opening entire. 



p. laevigata. — Lorica ovate, oblong, smooth, foramen with eight 

 dentations, approaches D. denticulata. 



1). striolata. — Lorica ovate, oblong, dehcately striated longitudi- 

 nally ; foramen with a dentated border. 



D. hruderi. — Lorica ovate, surface rugose, the end presenting the 

 aperture rather attenuate but truncate ; margin of apertirre entii'e. 

 Length I'iO^Oth. Found on moss. 



1), c'«/<a'?7(?^«.— -Lorica oblong, obtuse ; siuiacc beset with imper- 



