578 THE VOYAGE OF H.M.S. CHALLENGER. 



species. Weinkauff (Conch. Cab., ed. Kiister, p. 45, pi. v. figs. 9, 11) refers, I suppose, to this species, 

 under the name of Litorina (Tectarius) thiarclla, Anton, though his description is vague, 1 and his 

 figure might represent anything. 



2. Echinella, Swainson, 1840. 

 Echinella (?) tectiformis, Watson (PI. XLIII. fig. 1). 



Echinella (?) tectiformis, "Watson, Prelim. Report, pt. 5, Journ. Linn. Soc Lond., vol. xv. p. 95. 



Station 235. June 4, 1875. Lat. 34° 7' N., long. 138° E. Japan. Bottom tempera- 

 ture 38°. 1 F. 565 fathoms. Green mud. 



Shell. — High, conical, tectiform, carinated, umbilicated, with a flattish depressedly 

 conical base. Sculpture : there are many sinuous, rather remote, longitudinal puckerings, 

 minute below the suture, then evanescent, but on the whole lower half of the whorls 

 rising into rarer, narrow, sharply rounded riblets, separated by flat intervals of fully twice 

 their width ; on the carina they rise into sharpish little longitudinal tubercles ; below this 

 they rapidly and almost wholly disappear, showing on the base only as slight undulations 

 marking the very curved lines of growth. Besides these there are minute round threads 

 which fret the whole surface. Spirals — the base of each whorl is thrown out into a narrow 

 sharp expressed carina, which is rendered more prominent both by the longitudinal 

 tubercles and by the imbrication of the whorls, which project markedly above the suture ; 

 the whole surface of the shell is, moreover, covered with fine unequal rounded threads, 

 which are coarser in proportion to the development of the longitudinal puckerings, and 

 which are crisply crimped by the finer longitudinals. On the base a slight swelling runs 

 round near the outer edge. Colour a dead, faintly yellowish, chalky white, but which is 

 not altogether without polish. Spire very high and narrow. Apex broken. Whorls : only 

 four remain, of very regular increase; flatly and very straightly sloping down from the deep 

 suture to the carina, below which they are sharply constricted ; each whorl is thus imbri- 

 cated over the one which succeeds it. Suture squarely angulated and deeply impressed. 

 Mouth squarely rounded, rather small. Outer lip thin. Pillar lip broadly reflected over 

 the umbilicus. Umbilicus small but deep, with a narrow swollen edge. H. 0'9 in (?). 

 B. 0-65, least 0-58. Penultimate whorl, height 0'2. Mouth, height 0*25, breadth 0"25. 



The only specimen of this species is badly broken, so that the measurements, that of height in 

 particular, are somewhat imaginary. It is so remarkable a form, however, that it is well worth 

 preservation and description. In the absence of apex, operculum, and animal, its generic place is 

 somewhat doubtful. The texture of the shell rather suggests a Solarium, but its extraordinarily 

 high and narrow form, its almost poriform umbilicus, and the character of its sculpture point more 

 to Echinella. In shape it resembles Helix schrammi, Fischer (Journ. de conch., 1858, p. 184, pL vii. 

 fig. 8), more than anything else I know. 



1 Weinkauff says the " Embryonalende" is "ungeziert, glanzendglatt." Where unrubbed the surface shows 

 spiral threads, of which the highest is tubercled, and these arise almost, if not quite, at the very top. 



