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Show 1885.] 'LIGHTNING'AND ' P O R C U P I N E ' EXPEDITIONS. 43 over the spiral ridges, a nodose or tuberous appearance is caused their intersection; the base is covered with delicate and close-se't spiral striae ; apex smooth: colour pearly white: suture slight: spire short, turreted : whorls 5-6, convex ; the last occupies three fourths of the shell; the first or topmost whorl is bulbous and intorted : mouth large, polygonal, irregularly sinuated at its base: outer lip thin and prominent : fissure placed a little below the suture of the last whorl ; it is broad, deep, and ends in a curved indentation : inner lip none : pillar semicircular : umbilicus narrow, but distinct and deep-margined outside, and defined by a slight ridge or keel which terminates in a sharp and proiectina; point. L. 0-125, B. 01. 'Porcupine' Exp. 1870: Atl. St. 16, 17, 17a. Distribution. Bay of Biscay ('Travailleur' Exp.). Not S. eritima of.Verrill, judging from the description and figure. 3. SEGUENZIA TRICARINATA1, Jeffreys. (Plate V. fig. 2.) S H E L L globose, very thin and fragile, transparent, and of a glassy lustre : sculpture, three spiral thread-like striae or keels on the body-whorl, viz. one encircling the periphery, another at a short distance below it, and a third at a somewhat greater distance above the peripheral stria ; the penultimate whorl is marked with a similar stria, a little above the suture ; the next whorl is keeled at the top : colour whitish : suture deep : spire short and compressed : whorls 3-4, convex ; the last is disproportionally large ; apex flattened : mouth roundish, angulated at the base : outer lip thin; fissure wide but shallow, forming an angular indentation: inner lip filmy : pillar gently curved and thickened: umbilicus narrow and shallow, margined outside by a slight but distinct semicircular stria or keel. L. 0-075, B. 0-075. « Porcupine' Exp. 1870: Atl. St. 17a. A single but characteristic specimen. Distribution. Off C. Verd. I. ('Talisman ' Exp.) ; 1192 fms. 4. SEGUENZIA CARINATA, Jeffreys. (Plate V. figs. 3, 3 a.) S. carinata, Jeffr. Proc. R. S. 1876, p. 201 ; Ann. & Mag. Nat. Hist. 1877, p. 320. ' Porcupine ' Exp. 1870 : Atl. St. 16, 17a, off C. Espichel, 22. Distribution. North Atlantic ('Valorous' Exp.), off Fayal, Azores (* Challenger' Exp.), off Marocco, Sahara, C. Verd. I., and Azores ('Talisman'Exp.); 681-2199 fms. This species has a labial slit as in the typical species S. formosa. 5. SEGUENZIA RETICULATA, Philippi. Solarium reticulatum, Phil. Moll. Sic. ii. p. 149, t. xxv. f. 6. 'Porcupine' Exp. 1870: Atl. St. 9, 16, 17, 17a. Distribution. Coast of Portugal ('Travailleur' Exp.), off Ascension I., and Culebra I. (' Challenger' Exp.) ; 390-1791 fms. 1 Having three keels. |