Verruca grex n. sp., Malay Archipelago at different places. 450 — 984 m. 



1'i-rruca conchula n. sp., South of Timor, 520 m. 



Verruca conc/iu/a var. minor n. var., Kei Islands, 310 m. 



Verruca capsula n. sp., Malay Archipelago at different places, 520 — 1300 m. 



■ Verrtica crislallina Gravel, Andaman Isl. 768 — 785 m. 



Verruca cassis n. sp., Malay Archipelago at different places, 794 — 1600 m. 



Verruca nitida Hoek, Near Talaut Isl. and Strait of Makassar, 915 — 1300 m. 



Verrttca casula n. sp., Between Ceram and New Guinea, 924 m. 



Verruca navicula n. sp., Malay Archipelago at two different places, 924 — 959 m. 



Of the new species, one ( Verruca cassis), was found at 4 Stations, two ( Verruca capsula and 

 V. grex) at 3, one [Verruca navicula) at 2, and two [Verruca casula and conchula) each at 

 1 Station. Of the last-named species, a variety was found at another Station. Some Stations seem to 

 be very favourable for the growth and development of species of this genus, e. g. the Stations 88 

 and 170, where two, and the Station 297, where three, different species of Verritca were col- 

 lected. One should be cautious, however, in attaching too much value to such particulars, 

 since dredging, especially at great depths, is a haphazard way of exploring the bottom of 

 the ocean. Our knowledge of the distribution of these species, in consequence, is as yet 

 very imperfect. 



All the species collected by H. M. S. "Siboga" are true deep-sea species-, they were 

 collected at depths varying from 310 — 1600 m. Shallow water forms, such as Verruca 

 strömia O. Muller, do not seem to occur in the East Indian waters. Although most of the 

 shallow water and shore species of this genus [V. strömia, V. laevigata and V. Spenglerï) have 

 depressed shells, the species collected in deeper water are not depressed, but have more or 

 less perpendicular walls. Of the species described by Darwin (1. c. p. 523) this is the case in 

 V. nexa only. Darwin obtained this species from the West Indies and found it attached to a 

 Gorgonia, but the place and depth where it was collected is not mentioned. It can be said, 

 however, that the genus Verruca, like Scalpelhun, was introduced into the zoological system from 

 specimens collected in shallow water and distributed over different seas of the world and that 

 it was not until later that it was found to have a great bathymetrical range and to include 

 many deep-sea species. It can now be considered best as a deep-sea genus, a few only of the 

 species of which occur in shallow water. 



The new species here described are, I think, very characteristic ones and will be easily 

 recognised should they turn up again. V. cassis may, perhaps, be an exception which will be 

 found later to be identical with V. cristallina Gruvel, or not to differ sufficiently to maintain 

 it as a different species. V. capsula resembles V. magua Gruvel in several characters; there 

 are, however, sufficiënt grounds to consider these two forms as different species. 



1. Verruca capsula n. sp. PI. XII, fig. 1 — 3. PI. XIII, fig. 1 — 4- 



Shell somewhat depressed, with the basis broad, irregularly circular ; moveable valves 

 nearly parallel to the basis. Moveable scutum and tergum each with three articular ridges. Second 



