Zoological Society, 355 ZOOLOGICAL SOCIETY. August 13, 1844. — Professor Owen, V.P., in the Chair. " Descriptions of new species of Area, chiefly collected by H. Cu-ming, Esq. in the Philippine Islands," by Lovell Reeve, Esq. Arca obtusa. Area testd ohlongd, Modiolceformi, lateribus obtuso' rotundatis, margine ventrali bysso paululum hiante ; albd, epider-mide nigricante subsquamosd partim indutd ; radiatim striatd, striis elevatis ; umbonibus depressiusculis, approximatis ; ligamenti area parvd, angustd, profunde declivi. Conch. Icon. Area, pi. 12. f. 77. Hab. Coast of Japan (found under stones) ; Dr. Siebald. Very like a Modiola in shape, but not the recent analogue of the fossil A. Modiolceformis of Deshayes. Arca cunealis. Arca testd elongate -oblong a, lateribus supernt angulatis, antieo brevi, rotundato, postieo elongato, angulato, carind ab umbone ad marginem deeurrente, margine ventrali bysso hiante ; pallide fused, epidermide molli lamellatd indutd; radiatim striatd, striis elevatis, fortiter granulosis, aredposticd subindistincte nigri-costatd; umbonibus sub approximatis, ligamenti ared latiusculd, concavd, sulcis ligamentariis anticis posticisque, subdistantibus . Conch. Icon. Arca, pi. 13. f. 87. Hab. Zanzibar (found under stones at low water) ; Tliom. The sculpture of this species corresponds precisely to that of the Arca mutabilis ; the form of the shell is more depressly elongated, the anterior side is shorter, and there are ligamentary grooves on the posterior part of the cardinal area as well as on the anterior. Arca tenella. Arca testd subcylindraceo-oblongd, Modiolceformi, tenui, subpellucidd, lateribus obtuso-rotundatis, margine ventrali vix hiante ; pallide fuscescente, epidermide molli leviter indutd ; radiatim subtilissime striatd, striis granulosis ; umbonibus obtusis, antice incurvis ; ligamenti ared antice latiusculd, postice lanceolato-acuminatd. Conch. Icon. Arca, pi. 14. f. 91. Hab. Island of Burias, Philippines (found under stones at low water) ; Cuming. A delicate light brown shell, beautifully striated, with a soft scat-tered epidermis. Arca setigera. Arca testd subquadrato-oblongd, lateribus rotun-datis, postieo latiore, margine ventrali bysso vix hiante ; rubido-fuscd, epidermide fused setigerd indutd ; radiatim subtilissime striata^ striis elevatis, granulosis; umbonibus subapproximatis, antice adjectis ; ligamenti ared angustd, declivi. Conch. Icon. Arca, pi. 14. f. 94. Hah. Zanzibar (found under stones at low water) ; Thorn. This species approaches very closely to Arca lacerata ; it appears, however, to be of an uniform smaller size, the posterior side is less expanded, and the bristles are set in single rows.
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