112 



Fig. 15. Neilonella whoii. The dissected stomach and style sac as seen 

 from a, in left lateral and b, frontal view. See abbreviations to text 

 figures on p. 102. Scale = 1mm. 



f U4<± 



B 



Fig. 16. Neilonella whoii. a, right lateral view of shell of elongate form, 

 from Atlantis II station 242 from the Argentine Basin, in right lateral 

 view and b, detail of the umbonal region of the same shell in dorsal 

 view. Scales = 1 mm. 



J.A. ALLEN AND H.L. SANDERS 



Family Nuculanidae Adams and Adams 1858 



A recent definition of the family is given by Allen, Sanders and 

 Hannah (1995). 



Subfamily Ledellinae Allen and Sanders 1982 



The subfamily is defined by Allen and Hannah ( 1 989) and comprises 

 two genera, Ledella and Tindariopsis. 



Genus LEDELLA Verrill and Bush 1897 



Type SPECIES. Ledella bushae Waren 1978. SD - Waren 198 1 . 



Shell small, short, robust, surface matt, concentric sculpture, in 

 some species scattered incomplete radial striae, usually rostrate, 

 single postero-dorsal ridge in some species, postero-ventral margin 

 very slightly sinuous, ventral margin in older specimens maybe 

 flattened, anterior and posterior hinge teeth series separated by 

 edentulous space bearing short internal amphidetic ligament 

 (resilium) which may be restricted to dorsal portion of hinge plate, 

 outer layer of ligament visible externally and maybe extended 

 anteriorly and posteriorly for a short distance, hind gut with various 

 configurations. 



Genus TINDARIOPSIS Verrill and Bush 1897 



TYPE SPECIES. Malletia (Tindaria) agatheda Dall 1 889. OD. 



Shell veneriform, matt surface, concentric sculpture, umbo large, 

 short rostrum defined by slight radial ridge and furrow, postero- 

 ventral margin slightly sinuous, anterior and posterior hinge teeth 

 separated by very small edentulous space, internal ligament small, 

 close to shell margin, external ligament robust, amphidetic. 



Ledella acinula (Dall 1890) 



Type SPECIMEN. Holotype USNM 95438. 



Type LOCALITY. U.S. Fish Commission Steamer 'Albatross' Sta. 

 2754, 1 1"40'N 58°33'W, East of Tobago, 1609m. 



Cited specimens. BMNH 1995047 



Malletia (Tindaria) acinula Dall, 1890, 253, pl.XIII, fig.4. 



Tindaria acinula Verrill and Bush 1898, 881. 



'Tindaria' acinula Sanders and Allen 1977, 55, figs 44, 45. 



Material: 



Cruise 



Sta Depth No Lat 

 (m) 



Long 



Date 



Gear 



1 



0758.0'S 34'28.0'W 20.2.67 ES 



08"58.0'N 54"04.3'W 27.2.72 ES 

 08'01.9'N 54"16.4"W 28.2.72 ES 



BRAZIL BASIN 

 Atlantis II 167 943- 



31 1007 



GUYANA BASIN 

 Knorr25 293 1456- 2 

 1518 

 295 1000- 4 



1022 

 299 1942- 108 0755. l'N 55"42.0"W 29.2.72 ES 

 2076 

 WEST EUROPEAN BASIN 



Chain 106 330 4632 3 50°43.5'N 1751.7'W 24.8.72 ES 

 J.Charcot DS79 3226 15 46'30.4'N 10'27.1'W 26.10.74 DS 

 Biogas VI 

 GUINEA BASIN 



J.Charcot DS28 1261 4 04'21.2'N 04°35.2'E -.-.71 DS 

 Walda 



