THE MOLLUSCA HEDLEY. 



475 



Fig. 43. 



OLATHUBELLA IBRETITA, sp. nov. 

 (Fig. 43). 



Shell ovate-fusiform, narrow, tur- 

 retted and sharply angled below a 

 sloping shoulder. Colour white, from 

 the suture to the angle opaque, below 

 the angle hyaline with opaque beads; 

 protoconch buff yellow, a splash of 

 the same on the anterior dorsal por- 

 tion of the last whorl; a pale yellow 

 thread, confined to one spiral cord, 

 ascends each whorl below the angle, 

 and another surrounds the last whorl 

 below the periphery. Adult whorls 

 four and a half. Sculpture the last 

 whorl bears fifteen longitudinal costae 

 which cross the flattened part of the 

 whorl obliquely, here they are separ- 

 ated by twice their breadth ; above 

 the angle they bend and enlarge suddenly, towards the base they 

 curve in and vanish at the basal constriction. On the penultimate 

 whorl these costse alternate with those below the suture. These 

 longitudinal costse are over-ridden by a series of fine sharp spiral 

 cords knotted at each costa ; the last whorl carrying four larger 

 and more undulating ones above the angle and ten below it ; on 

 the base are six simple cords. Protoconch horny, mamillate, 

 three and a half whorled, the larger sculptured with a raised net- 

 work, contrasting sharply by colour and texture with the adult 

 shell, which suddenly commences with a thick raised white tongue 

 at the suture. Aperture narrow and elliptical, columella arched, 

 overlaid by a callus which ends abruptly where the mouth narrows. 

 Canal short and wide. Outer lip massive, ridged externally by a 

 dozen transverse cords which denticulate the edges ; within are 

 seven weak entering ridges. The aperture mounts the preceding 

 whorl to the height of two spiral cords, and encloses a deep wide 

 anal notch with a prominent callus. Length 5, breadth 2 mm. 

 One specimen from the lagoon beach of Funafuti. 

 Closely allied to Clathurella euzonata, Hervier,* from which it 

 differs by being narrower, sharper angled, and sculptured by finer 

 and more numerous cords. With his species Hervier associates 

 C. bilineata, Angas, and C. bifascialum, Pease. 



DAPHNELLA DELICATA, Reeve. 



Reeve, Conch. Icon., i., 1846, " Pleurotoma," pi. xxxiv., sp. 310; 

 Tryon, loc. cit., p. 301, pi. xxvi., fig. 80. 



* Hervier Joura. de Conch., xliv., 1896 (1897), p. 143 ; ibid., xlv. 

 1897, p. 102, pi. ii., fig. 6. 



