8 Prof. 
PROTOZOA. 
and Spongosphoiridce ; they agree closely in the characters of the soft 
parts ; the distinction into Ectolithia and Entolitliia is often one of age, not 
of species. Some forms, including Tetrapyle, Muller, and its allies, are dis- 
tinguished as Fam. Dyssphoeridce^ as having undergone in their skeleton 
considerable modifications from the spherical type as exhibited in other 
Sphoiridea ; their inner shell lies outside the nucleus. 
Dkcidoi, (7) p. 186. All have, typically, a spiral structure. A sarcodic 
flagellum occurs in all observed Sponguridw except Spongurus cylindricus. 
Acanthodesmidce, (7) p. 196. The Zygocyrtidce of Hackel are included 
among Plagiacanthce^ and excluded from them; some species of 
Acanthodesmia are left doubtful as to position. Hiickel’s recent views as 
to their agreement in the possession of an annulate type of skeleton are 
confirmed. The membrane of the central capsule bears small rod-like 
bodies at the basal pole ; the central capsule contains a single capsule, 
but no round transparent vesicles. 
Flagiacanthidce, (7) p. 200. Formed from the Acanthodesmidce to 
contain Plagiacantha. 
CyrtidcB^ (7) p. 202. Generally but one nucleus. 
Pansolenue, Hackel, renamed Tr'ipylece', (7) p. 215. The family con- 
tains Aulacantha, Aidosphcera, Ccdodendrum, all of which have three 
openings in the central capsule ; a brownish mass covers one side of the 
capsule in perhaps all species ; in many instances two central capsules 
have been observed, in others two internal vesicles ; the membrane of the 
capsule is double ; in some cases an intra-nuclear network of fibrils was 
found. 
PhceodariUf Hackel, (6). New group of marine Radiolaria, defined as : 
Unicellular Rhizopoda, the central capsule containing a large nucleus ; cell 
membrane double, perforated ; in the extra-capsular sarcode lies excentri- 
cally a peculiar aggregation of dark pigment granules, called a 
Phceodium, and enveloped in a thick gelatinous envelope traversed by the 
pseudopodia. A strongly developed extra-capsular skeleton of various 
and often complicated form is generally present, usually sending out hol- 
low radii. The group is divided as follows : — 
Order I. Ph.®ocystia. Siliceous skeleton absent, or consisting of hol- 
low spicules outside the capsule, scattered or regularly arranged. 
Fam. 1. Phceodmidce. No siliceous skeleton. Genera, Phceo- 
dina^ Phceocolla. 
Fam. 2. Cannor [r] haphidce ; genera, Cannor [r] fiaphis, Tha- 
lassoplancta, Dictyocha. 
Fam. 3. Aulacanthidce ; genera, Aulacantha, Aulancora, Aulo- 
graphium. 
Order II. Ph.^ogromia. Skeleton consisting of a single reticulate 
shell with one or more chief openings ; sometimes with hollow 
processes as well. 
Fam. 4. Challengeri\% \ die ; genera, Challengeria^ Tuscarora\\\ 
Gazelletta, Porcnpinea^ Entocannula^ Lithogromia. 
Fam. 5. Castanellidoi ; genera, Castanella^ Caskinidiurtiy &c. 
Fam. 6. Circoporidw ; genera, Circoporus, Porostephanus, 
