CARDIUM, 



Species 24. (Mus. Saul.) 

 Cardium Australiense. Card, testa transverse ovatd, 

 Domriformi, medio subcontractd, posticejlexuoso-angu- 

 latd, subrostratd, antice compresso-attematd ; dimidio 



postico radiatna sulcata, ant tea lavigato, nilinlc ; al- 

 bidd, area pastird striijis brrcibim fuscis utriiiqiii- uniatd. 



The Australian Cockle. Shell transversely ovate, 

 Donax-shaped, a little contracted in the middle, pos- 

 teriorly flexuously angulated, slightly beaked, anteri- 

 orly compressly attenuated ; posterior half of the shell 



radiateh grooved, anterior sn th. shining; whitish, 



posterior area ornamented on each side with short 

 brown stripes. 



Reeve, Pro. Zool. Soc, 1844. 



Hob. Port Lincoln, South Australia ; Harvey. 



This shell may lie chiefly distinguished from the Car- 

 dium Donaeiforme, to which it is in many respects allied, 

 by the contracted flexuous prolongation of the posterior 

 portion, and by the peculiarity of one half of the shell l>inm 

 conspicuously grooved, whilst the other half is smooth 

 and shimuir. 



Species 25. (Mus. Cuming.) 



Cardium Donaciforme. Card, testa transverse ovatd, 

 solidiusculd, Domciformi, postice angulatd, antice com- 

 presso-attenuatd; radiatim sulcata, sulcis anticis minus 

 distinctis ; albidd, vel aurantio-lutescente, punctis ni- 

 gricantibus sparsis nebuloso-pictd. 

 The Donax-shaped Cockle. Shell transversely ovate, 

 rather solid, Donax-shaped, angulated posteriorly, 

 compressly attenuated anteriorly ; radiately grooved, 

 anterior grooves less distinct ; whitish, or orange yel- 

 low, nebulously painted with scattered blackish dots. 

 Schroeter, Einl. Conch., vol. iii. p. 68. 

 Eab. Island of Negros, Philippines (found in sandy mud 

 at low water) ; Cuming. 

 The Cardium Donaciforme is of a much more solid and 

 ventricose structure than the Cardium Australiense, want- 

 ing the posterior contraction, whilst the radiating grooves 

 extend over its entire surface. The colour assumes a 

 deeper tint and the spots are more clouded together on the 

 posterior area, though presenting no appearance of cross 

 stripes as in the preceding species. 



Species 20. (Fig. a, Mus. Cuming ; Fig. b. Mus. Saul.) 



Cardium tiugonoides. Card, testa trigono-cordatd, pos- 

 tice elongatd, subangulatd, umionibus obtuso-carinatis, 

 antici abbreviatd, subcompressd ; glaberrimd, albidd, 



radiis fasciscnttiliits, paalo etcratis, castis jitanutatis 

 d, -Iritis siiiiillimis, id) iiadinii'dnis mjidaritcr dicergrn- 

 tibus, ornatd. 



The triangular Cockle. Shell triangularly cordate, 

 elongated and slightly angulated posteriorly with the 

 umbones obtusely keeled, shortened anil compressed 

 anteriorly; very smooth, whitish, ornamented with 

 slightly elevated brown rays, very like worn flattened 

 ribs, diverging with great regularity from the um- 

 bones. 



Pallas, ' Reise durch verschied. Provinzen des Russischen 

 Reichs,' vol. i. ; Anhang (Appendix), p. 26, no. 80. 

 Card/a,,/ lineatum, Gmelin, Lamarck, Sowerby. 

 Didacna trigonoides, Eichwald. 



Hat,. Caspian Sea ; Pallas, Eichwald. 



The above is one of three shells described by Pallas in 

 a somewhat obscure work treating principally of botanical 

 subjects, entitled ' Journey through different Provinces of 

 the Russian Empire,' published at Leipzie in 1776. 



Although a species of some rarity in our collections, it 

 must be tolerably abundant in the Caspian Sea according 

 to the testimony of both Pallas and Eichwald. The for- 

 mer, in the work above quoted, says " copiosissima testa 

 mari Caspii " ; and the latter writer, in his ' Fauna Caspio- 

 Caucasia,' published onlj three years since, says " Hab. in 

 onini fere mari Caspio, in septentrionali Beque ae in meridi- 

 on.ili ejus parte." The Localitj given by Lamarck. "Seas 

 of America," is extremely \ ague, and most probably incor- 

 rect, as it appears to be founded merelj upon the fact of 

 his specimen, from the cabinet of M. Defranee. having been 

 presented to that naturalist by M. Richard after his return 

 from Guyana. 



It will perhaps be interesting to know that the shell be- 

 fore me, belonging to Mi-s Saul, is from the same source; 

 the chief portion of M Richard's conchological rarities fell 

 into the possession of Dr. ( ioodhall of Eton, and, at the 

 death of the venerable Provost, the specimen in question 

 passed into the collection of the Rev. Mr. Stainforth, to 

 whom it- prcM m |>o~-e-sor i^ indebted for it. 



November 1 SI i. 



