Familles and Gênera 



lO 



No. of species and varleties col- 

 lected by the "Siboga" Expédition 



No. of new species and varleties 



Family Gastrochaenidae. 



Rocellaria Blainville 



Family Pholadidae. 



Xylophaga Turton 



Pholadidea Godall 



Martesia Blainville 



Family Teredinidae. 



Teredo Linn 



2 

 I 



I (unidentifiable) 



I 



3 



2 

 I 

 2 



3 



2 



4 



15 



I 



I 



Family LATERNULIDAE. 



Laternula Rôding 



Family MvoCHAMIDAE. 



Myadora Gray 



Family Calopodiidae. 



Calopodium Roding 



Family Verticordiidae. 



Verticordia Sowerby 



Lyonsiella M. Sars 



Order SEPTIBRANCHIA. 



Family PoromyacidaE. 



Poromya Forbes 



Family Cuspidarhdae. 



Cuspidaria Nardo 



Myonera Dali & Smith. 



I 

 1 



2 

 2 



4 



II 

 I 



Total 



412 



90 



From the above analytical table it would be seen that in the "Siboga" collection in 

 addition to a number of forms which, owing- to the unsatisfactory nature of the material, could 

 not be identified specifically, 412 species and varieties of Pelecypods were identified. Of thèse 

 the following go forms are described as new : 



Nucula (Niicula) rugifei'-a sp. nov. 

 Nucula (Nucula) diapliana sp. nov. 

 Nucula (Nucula) exodonta sp. nov. 

 Nucula (Nucula) bathybia sp. nov. 

 Nticula (Nucula) pachydonta sp. nov. 

 Nucula (Nticula) nimbosa sp. nov. 

 Nucula (Nucula) daîitzenbergi sp. nov. 

 Nuculana (Nucidana) sibogai sp. nov. 

 Nuculana (Nuculana) robsoni nom. nov. 

 Nuctilana (Nuculana) procumbens sp. nov. 

 Nuctilana (Nuculana) bathybia sp. nov. 

 Nuculana (Nuctilana) approximans sp. nov. 



Nuculana (Thestyleda) modica sp. nov. 

 Nticîilana (Thestyleda) scalata sp. nov. 

 Nuculana ( Thestyleda) elaborata sp. nov. 

 Nuculana (Poroleda) parallelodonta sp. nov. 

 Nîiculana (Poroleda) sibogaensis sp. nov. 

 Nticulana (} Ledella) discrepans sp. nov. 

 Malletia erronea sp. nov. 

 Malletia encrypta sp. nov. 

 Malletia humilior sp. nov. 

 Malletia tripartita sp. nov. 

 N eilonella dubia sp. nov. 

 Neilonella schepinani sp. nov. 



