DEEP-SEA PROTOBRANCHIA (BIVALVIA) 



31 





DS85 4462 



2 



44°23.2'N 



4°50.8'W 



DS 



30.10.74 





CP13 3134 



2 



47°34.4'N 



9°38.0'W 



CP 



23.10.74 





CP16 4825 



1 



46°27.3'N 



10°25.0'W 



CP 



26.10.74 





CP17 4706 



2 



46°30.8'N 



10°19.5'W 



CP 



26.10.74 





CP19 4434 



1 



44°24.9'N 



4°51.3'W 



CP 



28.10.74 





CP22 4475 



2 



44°22.9'N 



4°54.8'W 



CP 



30.10.74 



Jean Charcot CPU 4823 



1 



48°20.4'N 



15°14.6'W 



CP 



1. 8.76 



(Incal) 



OS02 4829 



2 



48°19.2'N 



15°15.7'W 



OS 



2. 8.76 





WS03 4829 



3 



48°19.2'N 



15°23.3'W 



15°22.5'W 



ws 



1. 8.76 





DS14 4254- 



7 



47°32.8'N 



9°35.4"W 



DS 



7. 8.76 





4348 















DS15 4211 



6 



47°33.6'N 



9°39.1'W 

 - 9°38.5'W 



DS 



8. 8.76 





DS16 4268 



13 



47°29.8'N 

 - 47°30.3'N 



9°33.4'W 



DS 



9. 8.76 





OS05 4296- 



4 



47°31.3'N 



9°34.6'W 



DS 



7. 8.76 





4248 





- 47°32.2'N 



9°34.7'W 









OS06 4316 



5+l\ 



47°27.3'N 



9°36.2'W 



OS 



9. 7.76 



in*9.347°27.9'N 







9°36.0'W 







int3.9OS07 



4249 



12 



47°31.8'N 

 - 47°31.3'N 



9°34.3'W 



OS 



10.8.76 





OS08 4327 



13 



47°29.8'N 

 ■ 47°29.5'N 



9°32.9'W 

 9°38.8"W 



OS 



11. 8.76 





WS07 4281 



9 



47°30.6'N 

 - 47°31.2'N 



9°37.1'W 

 9°35.7'W 



WS 



7. 8.76 





WS08 4287- 



13 



47°30.5'N 



9°33.7'W 



WS 



9. 8.76 





4301 





■ 47°29.3'N 



9°34.1'W 









WS09 4277 



8 



47°28.8'N 

 ■ 47°27.9'N 



9°34.0'W 



WS 



10. 8.76 





WS10 4354 



18 



47°27.3'N 

 ■ 47°28.2'N 



9°39.9"W 



12°43.9'W 



WS 



11. 8.76 





KR07 2891 



8 



55°02.9'N 



12°43.9'W 



KR 



20. 7.76 



Chain 106 



321 2890- 

 1868 



2 



50°12.3'N 



13°35.8'W 



ES 



20. 8.76 





323 3356- 



39 



50°08.3'N 



13°53.7'W 



ES 



21. 8.76 





3338 





- 



13°50.9'W 









326 3859 



29 



50°04.9'N 



14°23.8'W 



ES 



22. 8.76 





328 4426- 



13 



50°04.7'N 



15°44.8'W 



ES 



23. 8.76 





4435 















330 4632 



29 



50°43.5'N 

 ■ 50°43.3'N 



17°51.7'W 

 17°52.9'W 



ES 



23. 8.76 



Restricted to abyssal depths in West European Basin, the 



Fig. 39 Yoldiella biscayensis. Lateral view of a shell from the right 

 side and detail of the hinge-plate of a left valve. Specimens from 

 Sta. 326 West European Basin. (Scale =1.0 mm). 



majority of specimens were taken from depths greater than 

 3500 mm. Depth range: 2150-4829 m. 



Shell description (Figs. 39-42). The form of the shell 

 varies somewhat from locality to locality. 



Form A: The following description is based on specimens 

 found in Bay of Biscay at 4000 m and below. 



Fig. 40 Yoldiella biscayensis. Outline drawings of shells of 

 different sizes from the right side to show change in shape with 

 growth. Specimens from Sta. 326 West European Basin. (Scale 

 1.0 mm). 



Fig. 41 Yoldiella biscayensis. Outline drawings of three shells of 

 similar size from the right side to show differences in shape. 

 Specimens a & b from Sta. BGVI DS 76 (4228 m); specimen c 

 from Sta. BG II DS 31 (2813 m). (Scale = 1.0 mm). 



