. Bulletin. Science; Natural history; Natural history. KI-SI ARCH NOTES A NEW SPECIES OF PUGNUS FROM COCOS-KEEL1NC. ISLANDS. INDIAN OCEAN (GASTROPODA) The littoral molluscan fauna of Cocos-Keeling Islands, isolated atoll group of the eastern Indian Ocean, was catalogued by Maes (Proc. Acad. Nat. Sci. Phil- adelphia. 119(41:93-217. 1967). and its geographic affinities assessed. Included in the collections which formed the basis of that report were several speci- mens of an undescribed species of Pugnus, a peculiar gastropod which may be an aberrant member of the Margtnellidae, a family under st
. Bulletin. Science; Natural history; Natural history. KI-SI ARCH NOTES A NEW SPECIES OF PUGNUS FROM COCOS-KEEL1NC. ISLANDS. INDIAN OCEAN (GASTROPODA) The littoral molluscan fauna of Cocos-Keeling Islands, isolated atoll group of the eastern Indian Ocean, was catalogued by Maes (Proc. Acad. Nat. Sci. Phil- adelphia. 119(41:93-217. 1967). and its geographic affinities assessed. Included in the collections which formed the basis of that report were several speci- mens of an undescribed species of Pugnus, a peculiar gastropod which may be an aberrant member of the Margtnellidae, a family under study by the author. Through the kindness of Virginia Orr Maes, Academy of Natural Sciences. Philadelphia, and Winston F. Ponder. The Australian Museum. I have had the opportunity to compare the Cocos-Keeling specimens with specimens of the Australian Pugnus parvus Hedley (Rec. Australian Mus., 2:105-106, 1896). the type and only species of the genus previously described. Sciences. Philadelphia. No. 288324. Fight paratypes. ANSP No. 32474, from same locality as holotypc. Referred material: ANSP No. 288311, one speci- men, from two miles east of Ujong Tanjong. West Island. Cocos-Keeling Islands, in 4 fathoms ( m). hard sand and weed; Ostheimcr, Orr, Ross, collectors, 1 1 February 1963. Discussion: From Pugnus parvus Hedley, originally described from Manly, near Sydney, New South Wales, the new species differs in several shell details: P. maesae has four nearly equal columellar folds: P. parvus has two large folds and a smaller, deeply seated fold posterior to them. Pugnus maesae has dentition on the outer lip; P. parvus has none. The specimens of P. parvus examined by the author, from Mallacoota. Victoria (nearly 300 miles south of Sydney), were rather narrower, in proportion to their length, than the new species. They showed a curious surface sculpture of shallow hexagonal pits arranged "honeycomb" fashion, elongating behind the outer lip into spiral sculpture like
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