ANTEllIOR. 69 



ANNUL ATED. (Annus, a ring.) Composed of, or surrounded by 

 rings, as in the case of Tubicinella, fig. 14. 



ANODONTA. Cuvier, 1798. Fam. Submytilacea, Bl. Nayades, 

 Lam. A genus composed of such species of N atades as have no 

 teeth on the hinge. Eiirope, North America, &c. The example 

 given is A. Cataractus, PL viii. fig. 152. 



ANOMALINA. D'Orb. A genus of microscopic Eoraminifera. 



ANOMALOCAEDIA. Schun. 1817. Venus flexuosa, and similar 

 species. See Thesafetjs Conchyliorum, PI. xiii. 



ANOMIA. Fam. Ostracea, Lam. and Bl. — Bescr. Irregular, in- 

 equivalve, sub-equilaternal, foliaceous, pearly within ; adhering 

 to marine substances by means of a bony appendage, which 

 passes through a large circidar opening in the lower valve ; mus- 

 ciilar impression divided into three irregular portions ; hinge 

 destitute of teeth with a short cartilage. — Obs. The Linnsean 

 genus included not only the shells to which the description above 

 given would apply, but also many other genera, such as Crania, 

 Orbicula, Terebratula, &c. which belong to the Brachiopoda, and 

 are perfectly distinct. The Anomiae are found in Europe, N. 

 America, Moluccas, Philippine Islands, &c. Eig. 186, in the 

 plates, is a somewhat reduced representation of a fuU grown 

 specimen of A. Ephippium. Eig. 187, the hinge of the under 

 valve, with the bony process. Eig. 188, the hinge showing the 

 opening through which it passes, PL xi. figs. 186, 187, 188. 



ANOSTOMA. See Anastoma, and Tomo&eeus. 



ANASTES. Klein. A genus formed of those species of Patella 

 which have a produced, recurved beak. Helcion, Montf. Ex. 

 PateUa peUucida, fig. 230. 



ANSULUS or ANSTLUS. See Akcyltis. 



ANTENOB. Montf. A genus of microscopic Eoraminifera. 



ANTEBIOB. In Bivalves is the side on which the head, or part 

 analogous to the head of the animal lies ; it is known in the 

 shell by the umbones, which if turned at all, are turned towards 

 that part. If there be a sinus in the impression of the mantle, 

 it is always on the posterior part of the shell. If the ligament 

 be placed only on one side of the umbones, it is only on the 



