. Bulletin of the British Museum (Natural History). 252 CP. NUTTALL. holotype of Semisinus peyeri de Greve (PIMUZ 356). The inner and outer lip meet adapically to form a moderately obtuse arch. The columellar and parietal callus pad has a definite rim on its left margin because it stands proud of the main shell surface. The base of the aperture is produced anteriorly in a way reminiscent of the pouring lip of a jug to form a basal notch. Dimensions. In mm. h hi hap h/br sa ANSP 13088, lectotype of L. eucosmia * ANSP 13089, lectotype of L. hopkinsi *15 (P&O) 28° ANSP 13090
. Bulletin of the British Museum (Natural History). 252 CP. NUTTALL. holotype of Semisinus peyeri de Greve (PIMUZ 356). The inner and outer lip meet adapically to form a moderately obtuse arch. The columellar and parietal callus pad has a definite rim on its left margin because it stands proud of the main shell surface. The base of the aperture is produced anteriorly in a way reminiscent of the pouring lip of a jug to form a basal notch. Dimensions. In mm. h hi hap h/br sa ANSP 13088, lectotype of L. eucosmia * ANSP 13089, lectotype of L. hopkinsi *15 (P&O) 28° ANSP 13090, lectotype of L. lapazana *14 (P&O) 30° ANSP 13072, L. waringi. type illustration. 14 (P&O) ANSP 13078, L. lacirana. type illustration * (P&O) PIMUZ 356, holotype of L. peyeri 28° PIMUZ 358, paratype of L. peyeri 32° (P&O) = Measurements from Pilsbry & Olsson (1935); * = decollated or other damage. Note. Most of the specimens are too incomplete for meaningful measurements to be made. Measurements of spire angles are prone to error in the case of specimens partly embedded in matrix and are best omitted. Remarks. One of the important but less obvious features uniting the nominal species placed in synonymy here is that the spiral ribbing is not markedly dominant over the collabral folding as in S. tuberculifera (Conrad) and S. coronata (Ethcridge), both of which occur at Iquitos with the present species. The apertural features given in the above description and the character of the ribbing are those of Longiverena. Parodiz (1969) synonymized the Colombian species H. lapazanus, H. hopkinsi and H. laciranus under the name H. eucosmius. His illustrations of the species are copies of Pilsbry & Olsson's originals: thus Parodiz pi. 16, fig. 10 = hopkinsi; fig. 11 = lapazanus (Pilsbry & Olsson's fig. 4); fig. 13 = eucosmius. He did not refigure H. laciranus. This synonymy is accepted here, and to avoid confusion th
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