iQb TELLINA. 



SYMPHYNOTA. Lea. A genus of Nayades, in wMch Mr. Lea 

 proposed to include species of the genua Unio, the valves of 

 which are connate, or united at the dorsal margin. We believe 

 that this distinction, as a genus, has been abandoned by its 

 author. The fact is, that all the Uniones are Symphynotse when 

 in a young state. In Unio Alatus, (fig, 147) and Dipsas pUcatus, 

 (fig. 142) it will be observed that the valves have not separated 

 at the dorsal edge, but are broken lower down, PI. viii. fig. 142, 

 147. 



SYNDOSMYA. Eecluz. A Tellinseform genus of shells, having 

 a cartilaginiferous pit in each valve, and distinct lateral teeth. 

 Ex, S. alba. PI. xxvii. fig. 572. 



TALONA. Gray, 1840. Pholas tridens. See monograph of the 

 genus Pholas in Sowerby's Thesaurus Conchyliprum, PI. 10. sp. 

 89, fig. 60, 61. 



TAPADA. (Grray. Turton. p. 127.) A division of the genus 

 Helix, containing Helix aperta, Auct. or the Tapada snail. 



TAPES. Schum. Pullastea. Sow. T. litteratus. See mono- 

 graph, Thesaurus Conchyliorum, PI. 13, 14 ; and our figure, PI. 

 vi. fig. 120. 



TECTUEA. " Tecture," Aud. and Edw. Ann. Sei. Nat. 1830. 

 LoTTiA, Grray, 



TECTUS. Montf, A genus composed of species of the genus 

 Trochus, having elevated, conical spires, and columella notched 

 or truncated by a spiral fold. Trochus maculatus, presents an 

 example. PL xvi. fig. 359. 



TEINOSTOMA, H. and A. Adams. A genus formed of two 

 interesting shells collected in W. Colombia, by Mr. Cuming. 

 They are formed like the EoteUae, and the Nassa JS^eritoidea, but 

 have the aperture quite simple and smooth, with the outer lip 

 produced into a peak. Ex. T. politum. PL xxviii. fig. 589. 



TELEBOIS. Montf. A genus of microscopic Eoraminifera. 



TELESCOPIUM. Chemn. Cerithium Telescopium, Auct. fig. 

 378, 



TELLINA. Linn. Fam. Nymphacea, Lam. Conchacea, Bl. — 

 Descr. Sub-equivalve, inequilateral, compressed, rounded ante- 



