2^aviculacea.] infusokial animalcules. 317 



AMpnoRA lineolata = Navicula lineolata. — Elliptic-oblong ; turgid 

 at the middle ; apices somewhat elongated, but truncate ; with strong 

 longitudinal lines on the margin, and very fine ones in the centre 

 portion. (1 -480th to 1 -140th.) Venice, Vera Cruz, Peru. 



A. Veneta. — Minute; in one aspect, elliptic-oblong ; in the other, 

 semi-elliptic; apices truncate. (l-1200th to l-1080th.) Venice. 



A. elliptica. — Imbedded in amorphous mucus ; lanceolate-elliptic ; 

 transversely striated on the margin ; apices rather attenuate, but 

 obtuse and truncate, with a central single aperture. Baltic. 



A. afonina. — Lanceolate-elliptic, extremities produced; truncate, 

 without longitudinal lines. (l-1080th to l-650th.) In hot springs. 



A. Coffeaformis = JSfavicula (?) quadricostata. — Lanceolate, apices 

 produced, obtusely rounded; with four strong longitudinal lines on 

 the margin, and some very fine ones in the centre. (l-1720tli to 

 l-480th.) In mineral water, Carlsbad. 



A. hyalina. — Hyaline; elliptic-lanceolate, and more or less acute; 

 traversed by a very few delicate longitudinal lines. (1 -600th to 

 1 -432nd.) Baltic. 



A. acutiuscula. — Lanceolate, ends acuminate, and rather acute ; 

 strong longitudinal marginal stripes. (l-576th.) Genoa. 



A. lorealis. — Very small ; oblong-lanceolate ; in some, ends more 

 acute than in others. Length^l- 1200th. In rock streams, Heligoland 



A. (?) Atomus. — Very minute ; on one side elliptic, and ends 

 rounded; on the other, linear and truncate. (1 -2640th.) 



A. gracilis. — Small, oblong, and having a delicate longitudinal band ; 

 apices truncate ; margin transversely striated. Mexico. (P. 15, f. 26.) 



A. navicularis. — Small, boat-shaped (navicular) ; apices acute ; 

 lorica transversely striped throughout. (P. 15, f. 37.) This may 

 prove to be a CymheJla or a Cocconema (Kiitz.) 



A. (?) carinata. — Large, navicular ; plane on each side, extremities 

 acute ; striae in four lateral fasciae. (1 -240th.) Island of Tjorn. 



A. crystalUna. — Smooth, convex dorsaUy ; concave ventrally ; 

 broadly ti-uncate at each end. (l-432nd.) Tjorn. 



A. fasciata. — Dorsum convex in the middle ; venter plane ; with 

 closely set and slender longitudinal rows of striae, about twelve in 

 number; ends, widely truncate. (l-456th.) 



