DEEP-SEA PROTOBRANCHIA (BIVALVIA) 



111 



Fig. 12. Neilonella whoii. Details of shell form of specimens, from Chain station 78 from the North America Basin, the type locality; a. left lateral, b, 

 dorsal and c, anterior views intact shells; d, the hinge plate of a specimen, from Incal station DS05 from the West European Basin; e, detail of the 

 umbonal region of the hinge plate of a specimen, from Chain station 78. Scales = 1mm. 



Fig. 13. Neilonella whoii. Four shells in outline, from Atlantis II station 

 72 from the North America Basin, in left lateral view to illustrate the 

 small changes in shape with increasing size. Scale = 1mm. 



Fig. 14. Neilonella whoii. A semidiagrammatic view of the internal 

 morphology as seen from the right side. For the identification of the 

 parts see text-figure 7, p. 106. Scale = 1mm. 



