On new Species of Histeride. 417 
with others in my collection from Greenland ; the number of 
spokes in the Finmark specimens ranges from sixteen to 
twenty-one. 
Genus TrocHopERMA, Theel. 
Trochoderma elegans, Theel. 
1877. Trochoderma elegans, Theel, ‘ Quelques Holothuries des Mers de 
la Nouvelle Zemble,” Nov. Acta Reg. Soc. Sc. Upsala, ser. iii. p. 11 
(separate copy), pl. il. 
This genus, like the last, is furnished with wheel-like 
spicules, but the tyre is rounded and armed with spines 
instead of furnished with triangular inward-directed processes, 
as in Myriotrochus. 
Ostergren writes :—‘ I have now before me a specimen of 
this species which is new to the Norwegian fauna; it was 
obtamed by G. O. Sars at Mortensnes, in the Varanger 
Fiord”’ (“ Holothuroidea of Northern Norway,” Bergens 
Mus. Aarbog, 1902, p. 21). 
EXPLANATION OF PLATE XXVII. 
Fig. 1. Eupyrgus scaber, Liitken, magnified ; the actual length indicated 
by the line below. 
Fig. 2. The same. Spicules as seen from above. 
Fig. 3. The same. Spicules as seen from the side. 
Fig. 4. Chirodota levis, Fabricius. <A spicule. 
Fig. 5. Myriotrochus Rinku, Steenstrup. Wheel-spicule in early stage 
of development. 
Fig. 6. The same. Wheel-spicule seen from above. 
‘iy. 7. The same. Wheel-spicule seen from below. 
Fig. 8. The same. Wheel-spicule seen obliquely. 
Fig. 9. The same. Wheel-spicule seen from the side. 
XL.—On new Specics of Histeridez and Notices of others. 
By G. Lewis, F.L.S. 
Tuis is the twenty-second paper on the Histeridz published 
in this Magazine, and the last before the issue of a new 
catalogue of the species belonging to the Family. In these 
papers about 418 species have been described. 
The Munich Catalogue of 1868 recorded 1151 species, but 
this number is reduced to about 1050 by the names that fall 
into synonymy. About 2316 species are known at present, 
and of these 1727 are represented in my collection; 631 of 
these are authors’ types, 296 species are represented by 
