OCR Text |
Show 672 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [Nov. 14, mouth oblong-oval: margin entire: inside glossy, showing the impression of the radiating striae. L. 0*2, B. 0*l5. ' Porcupine' Exp. 1870 : Atl. St. 16. Three specimens. This species differs from T. fulva in being more raised and oblong, as well as in the peculiar sculpture and position of the beak. 4. TECTURA PUSILLA **, Jeffreys. (Plate L. fig. 3.) S H E L L roundish-oval, somewhat depressed, rather thin, opaque and lustreless : sculpture extremely numerous, crowded and regular, delicate, minute strise, which radiate towards the margin as in other species, and cover the whole surface : colour whitish : beak placed at less than one third from the front margin; it is slightly incurved and pinched-up ; apex apparently deciduous : mouth roundish-oval: margin thin : inside smooth and glossy : scars indistinct. L. 0*125, B. 0*1. 'Porcupine' Exp. 1870: Atl. St. 16, 17a. A few dead specimens. 5. TECTURA ADUNCA2, Jeffreys. (Plate L. fig. 4.) S H E L L oblong, raised but contracted near the beak so as to make the latter more prominent, rather thin, opaque and lustreless: sculpture, several fine strise which radiate towards the margin ; most of them are alternately larger and smaller ; they do not extend to the upper part of the shell: colour whitish : beak placed in front, about one third of the whole length ; it is strongly incurved or hooked, and has a subspiral and deciduous apex: mouth oblong : margin thin, entire : inside smooth and glossy : head-scar semicircular. L. 0*2, B. 0*125. 'Porcupine' Exp. 1870, Atl. St. 17a. A single and imperfect specimen, but characteristic. Mr. Dall has seen it, and says it is probably his Cocculina beanii. I will, however, retain provisionally the specific name which I have given. Dall's species was dredged in the ' Blake ' Expedition off the West Indies in 399-562^ fathoms, and by Professor Verrill off the coast of N e w England in 100-365 fathoms. 6. TECTURA GALEOLA3, Jeffreys. (Plate L. fig. 5.) S H E L L resembling an ancient helmet or casque, strong and thick for its size, opaque and lustreless : sculpture, numerous and close-set fine and minute radiating strise, which cover the whole of the exterior; there are also occasional and well marked lines of growth, which are somewhat crowded towards the margin: colour whitish : beak small, incurved, and pointed, placed very near the front margin and almost overhanging it: margin entire, compressed and forming a rim on the front half: inside smooth: scars as in Lepeta caca. L. 0*225, B. 0*175. ' Porcupine' Exp. 1870 : Atl. St. 24. A single specimen. If the peculiar shape of this shell may be regarded as a generic character, I would suggest for it the name Dallia, as a mark of respect for the great malacologist M r . Dall, who has examined m y specimen. 1 Tiny. 2 Hooked. :i A hollow vessel shaped like a helmet. |