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Apologies for the problems which may have been evident between 6:00, 17/5/18 and 10:15, 18/5/18 UK Time. I think that they are fixed now.

Modulus tectum

Gmelin, J.F., 1791 Tectum/Glowing Modulus; Knobby Snail Shell size 15 - 30 mm E Africa - Philippines
Taxonomic Information
open bookPage/Plate
Molluscs of Okinawap 45/11
Philippine Marine MollusksVol. 1, p 102; Pl. 94/8-9
Encyclopedia of Marine Gastropodsp 467/2
Hamlyn Guide to Shells of the Worldp 50
Compendium of Seashellsp 63/2.2
Eyewitness handbooks - Shellsp 50
Collector's guide to Seashells of the Worldp 48/21
Australian Marine Shells Part 1p 129; Pl. 14/15
Guide to Australian Shellsp 6/16
Guide to Shells of Papua New Guineap 5/15
Shells of the Philippinesp 55/15
Sea Shells on the South African Shoresp 125
Marine Molluscs of Mauritiusp 33/72-3
Seashells of South East Asiap 28
Shells of Vietnamp 50; Pl. 10/24, 30
Modulus candidus Petit de la Saussaye, S., 1853 : C & SW Pacific
Indonesian Shells Ip 41/17
Compendium of Seashellsp 63/2.3
Australian Marine Shells Part 1p 129
Shells of Vietnamp 50
cameraImage Acknowledgments
1 Conchylinet
2 Guido Poppe
3 Eurasia Shells
4 Olivier Caro
5 Guido Poppe
6 Eurasia Shells
7 Olivier Caro