CORBULA.— Plate I. 



Hab. Chiriqui and Bay of Caraccas (found in sand and 

 mud at the depth of from three to seven fathoms). 

 Very prettily rayed at the umbones in the manner 

 just described. 



Species 4. (Mus. Cuming.) 



Corbula erythrodon. Corb. testa ovatd, subicquivalvi, 

 latere antico productiore, angulato-carinato ,• longi- 

 tudinaliter sulcatd, pallida, margine interna rubro- 

 purpurascente. 



The red-toothed Corbula. Shell ovate, nearly equi- 

 valve, anterior side the more produced, and angu- 

 larly carinated ; longitudinally grooved, pale, in- 

 terior stained round the edge with red or pinkish 

 purple. 



Lamarck, Anim. sans vert. (Deshayes' edit.), vol. vi. 

 p. 138. 



Hab. Japan ; Dr. Siebald. 



This species may be recognised by the rich marginal 

 painting of the interior. 



Species 5. (Mus. Cuming.) 



Corbula tunicata. Corb. testa subtrigono-ovatd, valde 

 incequivalvi, postice rotundatd, antice compresso-acu- 

 minatd, umbones versus angulato-carinatti ; valvd 

 dextrd prope umbonem sulcatd, aliter epidermide 

 densd indutd ; valvd sinistra pracipue majore, pro- 

 fundi sulcatd, multo comp/icatd. 



The tunicated Corbula. Shell somewhat triangu- 

 larly ovate, very inequivalve, rounded posteriorly, 

 compressly acuminated, and angularly keeled to- 

 wards the umbones, anteriorly ; right valve grooved 

 near the umbone, and covered elsewhere with a 

 thick epidermis ; left valve much the larger, deeply 

 grooved over its entire surface, and considerably 

 lapping over. 



Hinds, Pro. Zool. Soc, 1S43. 



Hab. Island of Corrigidor, Philippines (found in coarse 

 sand at the depth of seven fathoms) ; Cuming. 

 Straits of Macassar and Lagulhas Bank, Cape of 

 Good Hope (found on a gravelly bottom at the 

 depth of seventy fathoms) ; Hinds. 

 The Corbula tunicata differs from the C. sulcata, to 



which it is the next allied species, in the smaller valve 



being grooved near the umbone. 



Species 6. (Mus. Belcher.) 

 Corbula speciosa. Corb. testd subtrigono-ovatd, antice 

 angulato-curinulatd, subproductd ; valvis valde incequa- 

 libus, dextrd oblique striatd, striis elevatis, sinistrd 

 sulcatd, multo complicatd, sulcis latis, profundus ; 

 albidd, sanguineo vivide radiatd ; umbonibus com- 

 pressis. 



The handsome Corbula. Shell somewhat triangu- 

 larly ovate, angulately keeled and a little produced 

 anteriorly ; valves very unequal, right valve obliquely 

 striated, stria? raised ; left valve grooved and lapping 

 over, grooves broad and deep ; whitish, vividly 

 rayed with bright red ; umbones compressed. 



Hinds, Pro. Zool. Soc, 1843. 

 Corbula radiuta, Sowerby. 



Hab. Gulf of Nicoya (dredged in seven fathoms' water). 



This beautiful species was only known to Mr. Sow- 

 erby by a single small specinem found by Mr. Cuming 

 on the sands at Acapulco. Mr. Hinds has found it ne- 

 cessary to re-describe the beautiful specimens collected 

 by him in company with Captain Belcher ; and under a 

 new title in consequence of the word radiata having been 

 already used by Brocchi in reference to a fossil species. 



Species 7. (Mus. Cuming.) 

 Corbula ovulata. Corb. testd elongato-ovatd, postice 



rotundato, antice uciiminato-rostratd ; pallida, exili- 



ter sulcatd. 

 The oval Corbula. Shell elongately oval, rounded 



posteriorly, acuminately beaked anteriorly, pale, 



very finely grooved. 

 Sowerby, Pro. Zool. Soc, 1833. 

 Hab. Xipixapi, Bays of Montija and Caraccas, &c. 



(found in sandy mud at various depths from seven 



to seventeen fathoms) ; Cuming. 



A few odd valves of this species were found by Mr. 

 Cuming on the sands at Real Llejos and Mazatlan of a 

 clear pink colour, but very much worn. 



Species 8. (Fig. a and b, Mus. Cuming; Fig. c, 

 Mus. Belcher.) 



Corbula crassa. Corb. testd elongato-ovatd, plus mi- 

 nusve crassd et gibbosd, postice rotundatd, antice 

 trigono-acuminatd ; albd, interdum purpurascentc 

 tinctd, longitiidina/iter sulcatd, liris antice trigono- 

 complicatis. 

 The thick Corbula. Shell elongately oval, more or 

 less thick and gibbous, rounded posteriorly, trian- 

 gularly acuminated anteriorly ; white, sometimes 

 faintly tinged with purple, longitudinally grooved, 

 ridges lying one upon the other down the anterior 

 side of the shell in triangular plaits. 

 Hinds, Pro. Zool. Soc, 1843. 



Hab. Straits of Macassar, Malacca ; Hinds. Bais, Island 

 of Negros, Philippines ; Cuming (found on a floor 

 of coarse sand and gravel at. the depth of from three 

 to seven fathoms). 

 The growth of this shell is exceedingly irregular, the 

 posterior portion being sometimes larger than the ante- 

 rior, sometimes smaller ; it varies also remarkably in 

 bulk. 



