THE FAUNA OF BOULDER COUNTY 241 



a fine, often alveolar, sculpture. There are no projecting points or spines. The 

 form of the shell resembles that of Microchlamys. A. vulgaris Ehrenberg* 

 (strongly convex); A. costata Ehrenberg (with flattened lateral faces); A. dis- 

 coides Ehrenberg (very flat, 100 to over 200 fj. diameter); A. arenaria Greeflf 

 (shell moderately convex, without regular sculpture, pseudopodia of curious flat- 

 tened fimbriate form). A. arenaria is the same as A. microstoma Penard. A. 

 costata is the animal figured by Leidy as A . vulgaris var. angulosa. 



(49) Cryptodifflugia Penard. Broad flask-shaped or oval, with a clear chitinous 

 shell, occasionally with foreign particles attached. Pseudopodia slender, in our 

 species rarelj^ protruded. C. oviformis Penard. 



Family EUGLYPHIDAE 



Pseudopodia filiform. 



(50) Cjrphoderia Schlumberger. Shell flask-shaped, with the round mouth 

 (pseudopodial aperture) turned more or less to one side. All the species contain 

 little yellow or brown grains (pheosomes), very resistant to reagents. Our species 

 is yellowish or brown. C. margaritacea (Ehrenberg). 



(51) Eugl3^ha Dujardin. Shell elongated, shaped much as in Difflugia, but 

 entirely composed of imbricated oval or round siliceous scales; those of the aperture 

 are finely crenulated or denticulate. E. alveolata Duj.*; E. ciliata (Ehr.); E. 

 compressa Carter; E. cristata Leidy; E. lavis Perty. E. ciliata and compressa 

 have numerous fine spine-like lateral projections; the latter is greatly compressed. 

 E. cristata is long and narrow, with very fine long spine-Uke processes (modified 

 scales) at the aboral end. E. alveolata and IcBvis are without spiniform processes; 

 the latter is very small (35-60 m long), with the scales or plates indistinct. 



(52) Sphenoderia Schlumberger. Shell like Euglypha, with the same imbricated 

 scales, not compressed; margin of oral aperture in oiir species dentate, but the 

 margins of the scales not crenulate. S. dentata Penard. 



(53) Assulina Ehrenberg. Shell of the Euglypha type, greatly compressed; oral 

 aperture finelj^ denticulate. Our species is very small, about 35 y. long. A. minor. 

 Penard. 



(54) Trinema Dujardin. Shell of the Euglypha type but mouth on one side, 

 near the end, instead of terminal. T. enchelys (Ehr.)*; T. galeatum (Penard); 

 T. complanatum Penard; T. lineare Penard. T. galeatum has the mouth con- 

 spicuously wider than long; the others have it practically circular. T. com- 

 planatum is short and broad, the oral end not or hardly narrower than the aboral 

 T. lineare is very small, about 16 to 26 fi long, rarely as much as 30 m. T. enchelys 

 is about 40 to 45 m, rarely larger. 



iss) Corythion Taranek. Resembles Trinema, with aperture turned to one 

 side, but the scales elongate, indistinct. C. dubiutn Taranek; C. pulchellum 

 Penard. C. dubium is much broader than the other. 



Class ACTINOPODA 



Sarcodina provided with fine ray-like pseudopodia which are supported by a 

 central axial filament (Calkins). 



