Shell-bearing Mollusca (Bivalvia and Gastropoda) from submarine caves in Hong Kong Author Lam, Katherine Author Morton, Brian Author Leung, K. F. text Journal of Natural History 2008 2008-03-31 42 9 - 12 927 952 http://dx.doi.org/10.1080/00222930701862674 journal article 10.1080/00222930701862674 1464-5262 5225019 Diodora quadriradiata (Reeve, 1850) ( Figure 4A ) Figure 4. A and B, Diodora quadriradiata , height×length565.5×14.22 mm; C and D, Cypraea arabica arabica juvenile, height×width510.32×4.88 mm; E and F, Ergalatax contracta , height×width514.58×6.7 mm; G and H, Thais luteostoma , height×width5 24.83×16.22 mm; I and J, Engina armillata height×width58.35×4.67 mm. Description Shell length of Hong Kong specimens, 15 mm , conical with an almost central hole. Shell sculptured by dense radial ribs crossed by concentric growth lamellae. Type locality The Philippines . Distribution Indo-West Pacific. Intertidal to 10– 30 m .