104 



J.A. ALLEN AND H.L. SANDERS 



figures what he describes as 'Neilonella latior (Jeffreys)?, young 

 syntype of Leda sericea Jeffreys, Valorous Expedition, Stn 12, 

 USNM 199595' These valves are equilateral in shape and differ in 

 outline from N. salicensis. We have specimens of this species in our 

 collections and these we intend to describe in a later paper. 



Locard ( 1 898), not mentioned by Waren ( 1 989), came to the same 

 conclusion as ourselves and recognized three entities, Leda pusio, 

 L. striolata and L. salicensis, accurately separating them on shell 

 characters, the most significant of these being the more elongate, 

 triangular form and greater post-umbonal length of L. salicensis as 

 compared with L. pusio, both of which he figures. 



There is a relatively wide degree of variation in the height, length 

 and post-umbonal length of the shell in N. salicensis and this 

 variation is similar in populations from different basins (Figs 4 & 5). 

 This may, in part, explain why this species has been described anew 

 so many times. 



Material: 



Cruise Sta Depth No Lat Long Date Gear 



(m) 



NORTH AMERICA BASIN 



AtlantisII 



62 



2496 



13 



39"26.0'N 



70°33.0'W 



21.8.64 ES 



12 



64 



2886 



2 



38"46.0'N 



70"06.0'W 



21.8.64 ES 





73 



1330- 



1470 



495 



39"46.5'N 



70°43.3'W 



25.8.64 ES 



Chain 50 



87 



1102 



6 



39'48.7'N 



7040.8'W 



6.7.65 ES 



Chain 58 



103 



2022 



217 



3943.6'N 



70'37.4'W 



4.5.66 ES 



AtlantisII 30 131 



2178 



119 



3938.5'N 



70°36.5'W 



18.12.66 ES 



Chain 88 



210 



2024- 

 2064 



48 



39'43.0'N 



70°55.5'W 



23.2.69 ES 



GUYANA BASIN 













Knorr 25 



293 



1456- 

 1518 



2 



08°58.0'N 



54Tj4.3'W 



27.2.72 ES 





295 



1000- 

 1022 



1575 



08"04.2'N 



54"21.3'W 



28.2.72 ES 





297 



508- 



523 



194 



07°45.3'N 



54°24.0'W 



28.2.72 ES 





299 



1942- 

 2076 



1 



0755. l'N 



55"42.0'W 



29.2.72 ES 





307 



3835- 

 3862 



2 



12°34.4'N 



58"59.3'W 



3.3.72 ES 



WEST EUROPEAN BASIN 









Sarsia 



S33 



1537- 

 1830 



6 



43°41.0'N 



03°36.0'W 



13.7.67 ES 





S37 



1739 



2 



43°39.2'N 



03°30.2'W 



15.7.67 ES 





S40 



860 



4 



43"35.6'N 



03"24.8'W 



15.7.67 ES 





S44 



1739 



60 



43"40.8'N 



03"35.2'W 



16.7.67 ES 





S50 



2379 



16 



43'46.7'N 



03"38.0'W 



18.7.67 ES 





S65 



1922 



2 



46°15.0'N 



04°50.0'W 



25.7.67 ES 



Chain 106 



313 



1491- 

 1500 



432 



51°32.2'N 



12'35.9'W 



17.8.72 ES 





316 



2173- 

 2209 



583 



50"58.7'N 



13'01.6'W 



18.8.72 ES 



La Perle 



DS11 



2205 



1 



47"35.5'N 



08°33.7'W 



8.8.72 DS 



Biogas I 















J.Charcot 



DS25 



2096 



9 



44°08.2'N 



04°15.0'W 



1.11.72 DS 



Polygas 















J.Charcot 



DS32 2: 



2 



4732.2'N 



08°05.3'W 



19.4.73 DS 



Biogas II 















BiogasIII 



DS38 



2138 



2 



47'32.2'N 



08°35.8'W 



25.8.73 DS 





DS49 



1845 



70 



44°05.9'N 



04°15.6'W 



31.8.73 DS 



Biogas IV 



DS52 



2006 



16 



44'06.3'N 



04"22.4'W 



18.2.74 DS 





DS63 



2126 



5 



4732.8'N 



08"35.0'W 



26.2.74 DS 



Cryos 



CP07 



2170 



5 



44°09.8'N 



04'16.4'W 



21.6.74 CP 



Biogas V 















J.Charcot 



DS77 



4240 



1 



47°31.8'N 



09'34.6'W 



24.10.74 DS 



Biogas VI 



DS80 



4720 



4 



46'29.5'N 



10°29.5'W 



26.1 0.74 DS 





DS82 



4462 



1 



44°25.4'N 



04"50.8'W 



29.10.74 DS 





DS86 



1950 



198 



44'04.8'N 



04"18.7'W 



31.10.74 DS 





DS87 



1913 



173 



44°05.2'N 



04°19.4'W 



1.11.74 



DS 





DS88 



1894 



31 



44°05.2'N 



04'15.7'W 



1.11.74 



DS 



Incal 



DS01 



2091 



98 



5759.2'N 



10°41.3'W 



15.7.76 



DS 





DS02 



2081 



91 



5758.2'N 



10"48.5'W 



16.7.76 



DS 





CP01 



2068 



19 



5757.7'N 



10°55.0'W 



16.7.76 



CP 





DS05 



2503 



3 



56'28.1'N 



11*11.7'W 



18.7.76 



DS 





OS01 



2634 



4 



50'14.4'N 



13"10.9'W 



30.7.76 



OS 





WS02 2498 



1 



50°19.3'N 



12°55.8'W 



30.7.76 



WS 





CP10 



4823 



2 



48°25.5'N 



15"10.7'W 



31.7.76 



CP 





WS03 4829 



1 



48"19.2'N 



1513.3'W 



1.8.76 



WS 



Challenger 



232 



2195 



3 



5717.0'N 



10°16.0'W 



19.5.83 



ES 



7/83 

















CANARY BASIN 















Discovery 



6701 



1934 



8 



2745.2'N 



14°13.0'W 



16.3.68 



ES 



SIERRE LEONE BASIN 













AtlantisII 



142 



1624- 



20 



10"30.0'N 



17'51.5'W 



5.2.67 



ES 



31 





1796 















147 



2934 



16 



10°38.0'N 



17'52.0'W 



23.2.67 



ES 



ANGOLA BASIN 















AtlantisII 



191 



1546- 



52 



23°05.0'S 



1731.5'E 



17.5.68 



ES 



42 





1559 















200 



2644- 

 2754 



7 



09"43.5'S 



10"57.0'E 



22.5.68 



ES 





201 



1964- 

 2031 



41 



09"25.0'S 



11'35.0'E 



23.5.68 



ES 





202 



1427- 

 1643 



21 



08'56.0'S 



1715.0'E 



15.5.68 



ES 



Walda 



DS20 



2514 



4 



02"32.0'S 



08"18.1'E 



-.-.71 



DS 





DS25 



2470 



31 



0ri9.8'S 



0749.2'E 



-.-.71 



DS 



In addition to the material listed above we have examined the 

 following specimens from the Porcupine and Valorous Expeditions 

 housed in the BMNH:- 85. 1 1 .5.397^02; 6.9.27,28; 85. 1 1 .5.494-5; 

 89.1 1.1 1.10-13; 89.9.5.26-9; 77.1 1.28.24. We have also examined 

 specimens from the Galathea Expedition housed in the ZMUC, and 

 specimens mostly from the U.S. Fish Commission expeditions housed 

 in the USNM and MCZ. 



Distribution. Common throughout the Atlantic north of the 

 Argentine and Cape Basins and south of the Norwegian and Arctic 

 Basins. It is also found in the southwestern Pacific. It mainly occurs 

 at slope depths, occasionally at abyssal depths (West European 

 Basin), from 508m to 4829m. 



Fig. 3. Neilonella salicensis. a, internal inclined ventral view of the 

 hinge plate and teeth of a left valve; b, dorsal view of shell to show the 

 extent of the external ligament and detail of sculpture. Both specimens 

 taken from Walda station DS 25 in the Angola Basin. Scale = 1mm. 



