332 TESTACEOUS MOLLUSCA. 



T. Decollata.— Anomia D. Ck. /. 705. — D. p> 292. — A. De- 

 truncata, Gm. — W. t. 11,/. 19. — T. Dec. Desk. ed. Lam. 7, p. 350. 

 — Sow Th. 1, p. 355, t. 71,/. 68 to 70.— T. Det. PM, 1, p. 96, fc. 6, 

 /. 14. — Argiope Dec. Gray, Brack, p. 113, /. 22. Transverse, 

 rounded ventrally, angular at the dorsal extremities, thick, brownish : 

 valves very unequal, with only a few smooth obtuse radiating ribs ; 

 margin thickened, not flexuous at the ventral portion. Upper valve 

 large ; cardinal area large, triangular, flattened, with a large incom- 

 plete perforation. Lower valve semicircular; hinge-line transverse 

 and straight; interior with three radiating elevated ribs truncated 

 towards the hinge, and a cardinal tooth on either side. \. Mediter- 

 ranean. 1 



T. Cuneata. Risso, p. 388,/. 179.— Phil. Sic. 1, p. 96, t. 6,/. 13. 

 — Sow. Th. 1, p. 355, t. 71, /. 83, 4.— T. Soldaniana, Risso, p. 389, 

 /. 178.— T. Pera, Kust. (as of Muhlf.) vii. 1, t. 2, b, /. 14 to 18.— 

 Argiope C. Gray, Brack, p. 114. Very small, transverse, rounded 

 ventrally, rather angular and truncated dorsally, whitish ; valves very 

 unequal, roughish, with a very few obtuse radiating ribs, whose 

 intervals are rose-coloured. Margin crenated, nearly direct. Upper 

 valve obtuse, with a very large incomplete perforation ; hinge-area 

 large, flattened. Lower valve depressed, broadly suborbicular ; its 

 dorsal line straight, but notched in the middle ; internal appendage 

 merely a single rib. 2...2| lines. Mediterranean. 



T. Neapolitana. Scacchi, Os.Z. 2 (1833), _p. 18. — T. Seminulum, 

 Phil. 1. p. 97.— Sow. Th. 1, p. 356, t. 71, /. 87, 8 (and /. 85, 6 as 

 Lunifera). — Orthis N. Phil. 2, p. 69. — Argiope Forbesii, Davids. 

 — A. N. Gray, Brack, p. 114, /. 23. Minute, somewhat transverse, 

 inequivalve, compressed, acuminated dorsally, emarginate ventrally, 

 pale fulvous, with a very few rounded and nearly obsolete radiating 

 ribs. Perforation large, incomplete, triangular ; hinge-area moderate, 

 flattened, with small narrow deltidia. Lower valve with a straight 

 hinge-line ; internal appendage merely a single elevated central ridge 

 connected with the dental sockets by a loop on either side. Inner 

 margin thickened and granular. -| Sicily. 



T. Cistellula.* SearlesWood, An. N. H. 6 (fossil). — Megathyris 

 C. Br. Mol. %,p. 361, t. 57,/. 9.— Argiope C. Gray, Brack, p. 114. 



1 This, with the three following species, are the only known recent 

 members of the genus Argiope. " Small, transverse ; hinge-line 

 wide and straight, with a narrow area to each valve ; foramen large ; 

 deltidium rudimentary ; interior of smaller valve with one or more 

 prominent submarginal septa ; loop 2 or 4-lobed, adhering to the 

 septa, and more or less confluent with the valve." 



