. Bulletin of the British Museum (Natural History) Zoology. DEEP SEA PROTOBRANCHIA 159 Cruise Sta Depth(m) No. Lat. Long. Gear Date DS10 5875 DS11 5867 1 11°'N -11°'N 89 11°'N -11°'N 32°'W DS -32°'W 32°'W DS -32°'W Jean Charcot DS01 (Walvis) DS02 DS03 4657 KG05 5235 KG06 5210 KG08 5211 KG 13 4560 DS05 4560 CP01 5040 CP05 4500 DS06 4585 CAPE BASIN 5205-5240 2 33°'N -33°'S 5280 23 33°'S 1 1 1 1 1 34 3 1 33°'S 33°'S 33°'S 33°'S 33°'S 33°'S 33°'S 33°'S -33°'S 22 33°'S 05°' -05°' 05°' -
. Bulletin of the British Museum (Natural History) Zoology. DEEP SEA PROTOBRANCHIA 159 Cruise Sta Depth(m) No. Lat. Long. Gear Date DS10 5875 DS11 5867 1 11°'N -11°'N 89 11°'N -11°'N 32°'W DS -32°'W 32°'W DS -32°'W Jean Charcot DS01 (Walvis) DS02 DS03 4657 KG05 5235 KG06 5210 KG08 5211 KG 13 4560 DS05 4560 CP01 5040 CP05 4500 DS06 4585 CAPE BASIN 5205-5240 2 33°'N -33°'S 5280 23 33°'S 1 1 1 1 1 34 3 1 33°'S 33°'S 33°'S 33°'S 33°'S 33°'S 33°'S 33°'S -33°'S 22 33°'S 05°' -05°' 05°' -05°' 02°' 05°' 05°' 05°' 02°' 02°' 05°' 02°' -02°' 02°' W DS W DS DS KG KG KG KG DS CP CP DS ANGOLA BASIN (Walvis) DS07 5100-5214 18 26°'S -27°'S DS08 5225 1 29°'S DS09 5220 4 26°'S -27°'S 01°'E -01°'E 01°'E 01°'E -01°'E DS DS DS 3. 5. 6. Although there are recent descriptions of the shell of L. ultima (Knudsen, 1970; Waren 1978) with the advantage of large numbers of samples and many thousands of specimens we have been able to assemble much more information on population variations. Depth range. 1330-5875 m Description (Figs. 63-65). Shell solid, inflated, equilateral or almost so (postumbonal length 40-56% of total length de- pending on size), ornamented with sharp concentric ridges, slightly broader ventrally becoming narrow and fainter to- wards umbo with smooth area around umbo of varying width; umbos prominent, medially directed; dorsal margin convex, antero-dorsal margin forms smooth broad sloping curve with anterior margin, proximal postero-dorsal margin almost straight between umbo and distal end of hinge plate, distal margin short, deeply convex, forming relatively blunt rostrum which with posterior ventral sinuous margin gives '
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Keywords: ., bookcentury1900, bookcollection, bookpublisherlondonbutterworths
