CORBULA.— Plate III. 



culd, lavigatd, albidd, epidermide lutescente indutd; 



latere postieo rotvndato, antico subangulato ; umbo- 



nibus depressiusculis. 

 The smooth Corbula. Shell oval, equilateral, rather 



thin, smooth, whitish, covered with a yellowish 



epidermis ; posterior side rounded, anterior slightly 



angular ; umbones rather depressed. 

 Hinds, Pro. Zool. Soc, 1843. 

 Hub. Hong-Kong, China ; Hinds. 



The valves are curiously flattened or pinched near the 

 ventral margin. 



Species 21. (Mus. Catlow.) 

 Corbula Catlow.*. Corb. testd ovatd, crassd, depres- 

 siuscula, hevigald, albido-rosaccd ant flaeicante, la- 

 tere postieo rotundato, antico subangulato , intus 

 vivide rosacea. 

 Catlow's Corbula. Shell oval, thick, rather depressed, 

 smooth, whitish rose or yellowish, posterior side 

 rounded, anterior slightly angidar; interior vivid 

 rose-colour. 

 Reeve, Pro. Zool. Soc, 1844. 

 Hab. Port Nicholson, New Zealand ; Swainson. 



This shell approximates in some degree to the Corbula 

 Zelundica of Quoy, but it is not striated, nor does the 

 anterior side present the Tellina-like flexuosity of that 

 species. 



By the above title I wish to honour my kind friend 

 Miss Catlow, the authoress of a highly popular rudi- 

 mentary work on Conchology, who lately received it 

 from Mr. Swainson of zoological celebrity, now settled 

 at Wellington in New Zealand. 



Species 22. (Mus. Cuming.) 



Corbula trigona. Corb. testd trigond, hevigatd, lutes- 

 cente-albd, interdum fuscescente-rubro uniradiatd ; 

 latere postieo rotundato, antico abbreviato, abrupte 

 angulato, quasi abscisso ; umbonibus i-ectis. 



The triangular Corbula. Shell triangular, smooth, 

 yellowish white, sometimes stained with a single 

 broad ray of brownish red ; posterior side rounded, 

 anterior shortened, abruptly angulated, cut short 

 off as it were ; umbones straight. 



Hinds, Pro. Zool. Soc, 1843. 



Hab. Senegal. 



An interesting shell, presenting the same peculiarity 



of structure as the Corbula" faba and fusciata, indicative 

 of their living in situations where the water is brackish 

 rather than salt. 



Species 23. (Mus. Cuming.) 



Corbula bicarinata. Corb. testd quadrato-ovatd, so- 

 lidii, albidd, latere postieo rotundato, antico abrupti 

 abbreviato, quasi abscisso, bicarinato, carinis ab um- 

 bonibus decurrentibus ; valvis ambabus longitudinali- 

 ter subtilissime- costulatis ; umbonibus depressiusculis, 

 postice. incurvis. 



The double-keeled Corbula. Shell squarely ovate, 

 solid, whitish, posterior side rounded, anterior 

 abruptly shortened, cut short off as it were, double- 

 keeled, keels running down from the umbones ; 

 both valves longitudinally very finely ribbed ; um- 

 bones rather depressed, incurved posteriorly. 



Sowerby, Pro. Zool. Soc, 1833. 



Hab. Panama, Real Llejos, Caraccas, St. Elena, &c, 

 West Columbia (found in sandy mud at the depth 

 of from seven to seventeen fathoms) ; Cuming. 



The solid compact form of this shell is very charac- 

 teristic. 



Species 24. (Mus. Cuming.) 



Corbula scaphoides. Corb. testa elongato-ovatd, tenui, 

 iilhidit, siibobliqnr costatd, costis regularibus , inter - 

 stitiis striis minutis longitudinalibus cancellatis ; la- 

 tere postieo rotundato, antico elongato-producto, trun- 

 cato, angulato-carinato, carinis ab umbonibus decur- 

 rentibus. 



The boat-shaped Corbula. Shell elongately ovate, 

 thin, whitish, rather obliquely ribbed, ribs regular, 

 interstices cancellated with minute longitudinal 

 striae; posterior side rounded, anterior elongately 

 produced, truncated, angularly keeled, keels run- 

 ning down from the umbones. 



Hinds, Pro. Zool. Soc, 1843. 



Hab. Singapore, and Bais, island of Negros, Philippines 

 (found in sandy mud at the depth of seven fathoms) ; 

 Cuming. 



Our magnified representation of this shell has some- 

 what the appearance of Corbula crassa ; there is however 

 no danger of confounding the species, if due attention be 

 paid to the above characters. 



