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. 



