SPONGIIDA. 501 
Kent, W. S. On a new anchoring Sponge, Dorvillia agaricU 
formis. M. Micr. J. 1870, pp. 293-295. 
Leidy, J. Remarks on some curious Sponges [Hyalonemay 
Euplectellay Pheronema). Am. Nat. iv. p. 17 et seq. 
Miklucho-Maclay, N. Ueber einige Schwamme des nordlichen 
stillen Oceans und des Eismeeres. Ein Beitrag zur Mor- 
phologic und Verbreitung der Spongien. Mem. Peters. 1870. 
Contains descriptions of several new forms, with remarks also on the mor- 
phology of sponges in general. 
. Bemerkungen zur Schwammfauna des weissen Meeres 
und des arktischen Oceans. Bull. Petersb. June 1870, 
pp. 203-205. 
Schmidt, O. Grundziige einer Spongienfauna des atlantischen 
Gebietes. Mit seclis Tafeln. Fol. Leipzig : 1870. 
This important work, extensive os it is, does not profess to he an ex- 
haustive monograph of the subject. It deals almost exclusively with the 
siliceous sponges, Ilackel being, as is well known, at present occupied with 
a special monograph of the calcareous forms. It comprises : — 1. Considera- 
tions relative to classification, viz. : — a, typical forms and variability of the 
spicules ; &, the fibrous networks and arrangement of the hard parts j c, ana- 
logical and homological structures. II. Special description of the sponges 
occurring in the region of observation, many of which are only noticed 
generically. To this part is appended a table of comparison between Bower- 
bank’s British species (siliceous and horny) and those of the author. III. 
Results relative to geographical distribution and to classification. A table 
of geogi’aphical distribution is given, as likewise an embodiment of the 
author’s ideas as to the natural classification of sponges, in the form of a 
genealogical tree of the various families. 
. Das natiirliche System der Spongien. Mitth. Ver. 
Steierm. ii. 1870, pp. 261-269. 
The substance of this paper is included in the preceding larger work. 
Stewart, C. On a new Sponge, Tethyopsis columnifer. Q. J. 
Micr. Sc. 1870, pp. 281, 282. 
Vaillant, L. Note sur la disposition des pores ou orifices affe- 
rents dans la Cliona celata. C. R. Ixx. 1870, pp. 41-43. 
Translated Ann. N. H. (4) v. pp. 146-148. 
Wright, E. Perceval. Notes on sponges. — 1. On Hyalonema 
mirabiliSy Gray. 2. On Aphrocdllistes hocageiy sp. nov. 
3. On a new genus and species of Deep-sea Sponge. Q, 
J. Micr. Sc. 1870, pp. 1-9. 
Geographical Distribution. 
The following Species are given by O. Schmidt (pp. cit.') as occurring on 
both sides of the Atlantic : — 
AphrocalUstes hocagei, CoralUstes polydisciiSy Chondrilla nueida, 'Aplysina 
eerophohay Siphonochalina densay Vapillina suheriay Desmacella johnsoniy Des- 
