PROTOZOA. 
581 
Codosiga pidcherrimuSj Clark, p. 313, pi. 9. figs. 7-27. 
Anthophym millleri, Bory, p. 326, pi. 10. figs. 47-63. 
Astasia tricophora, Clap,, p. 330, pi. 9. figs. 45, 46. 
Monas consociata, Fres. Archer makes some remarks on a form ap- 
parently referable to this species. Quart. Journ. Micr. Science, 1868, vol. xvi. 
p. 119. 
Bnrsaria truncatella. Eberhard {1. c.), in noticing the appearance of part 2 of 
Stein’s ‘Organismus der Infiisionsthiere,’ contrasts Stein’s account of the deve- 
lopment of this Infusorian with his own observations, of which he gives a brief 
record, promising future details with illustrations, lie demonstrates for the 
first time the passage of an “ acineta ” form into a ciliate form in young Infu- 
soria, — this observation confirming Stein’s notion that the minute Acinetro 
proceeding from Paramcccinm are in reality its offspring, and not parasites as 
a.<^serted by Balbiani. 
II. SPONGIIDA. 
Dr. J. E. Gray {1. c. p. 165) proposes the following divisions 
of the Malacospor^ : — 
Subsection I. Leiospongla!). Spicules none, or, when present, of only one 
kind. 
Order 1. Keratospongice (Horny Sponges), including the families Spongiadse 
&c. 
Order 2. Raghispongice (Needle Sponges) — that is, the order Leiospongije 
of Dr. Gray’s Table {vide Zool. Record, 1867, p. 670), including Hali- 
chondriadne &c. 
Subsection II. AcANTHOSPONOTiE. Spicules always present, of more than 
one form, akin in each Sponge. 
Order 3. Coralliospongim (Coral Sponges). Spicules anchylosed by sili- 
ceous matter, as Dactylocalycidre, Aphrocallistida3, Euplectelladae. 
Order 4. Armatospongice (Armed Sponges). Spicules distinct, more or less 
immersed in horny or fleshy matter. Includes Esperiadte and Te- 
thyadie. 
Subsection III. Arenospongiae, or Sand Sponges, &c. 
Wyville Thomson (/. c.) proposes the following raodification 
of Dr. SchmidCs arrangement of Sponges : — 
Subclasss I. 
(Porifera) Calcarea . . . . 
r Order 1. 
,, Subclass 11. 
* (Porifera) 
SlLICEA. 
VlTREA 
. Order 2. 
Halichondrida 
Order 3. 
CORTICATA . . . 
Order 4. 
Arenosa 
Order 5. 
Halisarcina . 
( Suborders, 
j a. Halichondrina . . 
1 h. Gumminina , . . . 
(c. Spongina 
Genera. 
Grantia &c. 
Hyalonema &c. 
Halichondria &c. 
Gnmmina &c. 
Spongia &c. 
Geodia &c, 
Xenospongia. 
Halisarca. 
