REPORT ON THE GASTEROPODA. 607 



37. Hissoa tenuisculpta, Watson. 



Eissoa tenuisculpta, Watson, Madeiran Rissoae, Proc. Zool. Soc. Lond., 1873, p. 389, pi. xxxvi. fig. 28. 

 „ (Pisinna) tenuisculpta, Monterosato, Enumerazione, p. 26. 

 ,, tenuisculpta, Jeffreys, " Lightning " and "Porcupine" Moll., Proc. ZooL Soc. Lond., 1884, 



p. 125, sp. 34. 

 „ „ Weinkauff, Conch. Cab. (ed. Kuster), p. 148, sp. 49, pL xviii. figs, 6, 7. 



Station 24. March 25, 1873. Lat. 18° 38' 30" N., long. 65° 5' 30" W. North of 

 Culebra Island, West Indies. 390 fathoms. Pteropod ooze. 



Station 344. April 3, 1876. Lat. 7° 54' 20" S., long. 14° 28' 20" W. Ascension 

 Island. 420 fathoms. Volcanic sand. 



Habitat. — Madeira, 25 to 50 fathoms (Watson). North-east Atlantic, in from 72 to 

 1095 fathoms ; Mediterranean, Algerine coast, 92 fathoms (Jeffreys). 



The apex of the shells from Station 344 is more depressed than in any other specimens I have seen. 



A good many examples both of this species and of Bissoa coriacca, Manzoni, have come under my 

 notice, and I feel very strongly, as I stated in publishing the species, that the two must be put beside 

 one another as forming a very marked and peculiar group, and that not one of the Rissoidce, but I 

 have not seen anything that would support Dr Gwyn Jeffreys' "inclination to unite these two 

 Madeiran species." 



38. Rissoa (Setia) marionensis, n. sp. (PL XLIV. fig. 12). 



Station 144a. December 26, 1873. Lat. 46° 48' S., long. 37° 49' 30" E. Off Marion 

 Island. 50 to 75 fathoms. Volcanic sand. 



Station 145. December 27, 1873. Lat. 46° 43' S., long. 38° 4' 30" E. Between 

 Marion Island and Prince Edward Island. 140 fathoms. Volcanic sand. 



Shell. — Thin, ovate, conical, ruddy horny, smooth, with a blunt but conical tip, convex 

 but conical-sided whorls, a slightly impressed suture, a blunt rounded base, an unvarixed 

 lip, and a round mouth. Sculpture: with the exception of extremely fine lines of growth, 

 there is none whatever. Colour horny, being transparent, fulvous, and more or less glossy, 

 under a thin dull epidermis ; the latter part of the last whorl is white and translucent. 

 Spire conical. Apex bluntly conical, rounded, and pointed. Wliorls 5 ; on the sides 

 they are convexly conical ; they are of very regular increase. Suture slightly impressed, 

 very little oblicpae. Mouth rather large, round. Outer lip sharp, patulous but above a 

 very little inverted, at its insertion shortly and slightly parted from the body. Inner lip : 

 on the body defined and very short, on the pillar patulous, and having an umbilical furrow 

 and chink behind it. H. 0-074 in. B. 0-044. Mouth, height 0-032, breadth 0*029. 



This species is very near Eatoniella subrufcsccns, E. A. Smith, but is, I think, different. In that 



