3 Prot . 
PROTOZOA. 
established for the reception of those forms in which the tentacles are 
merely adhesive. With reference to the development of the Tentacu - 
lifera from ciliated embryos, the class, as a whole, is regarded as repre- 
senting the most highly organized group of the Infusorial series. Affini- 
ties are at the samo time recognized as probably subsisting, with relation 
to the comparative and physiological function of the tentacles, between 
this group and the Rhizopoda and Radioluria. In the compound type 
- Dendrosoma , whose reproductive phenomena are here exhaustively re- 
corded for the first time, an extraordinary homoplastic resemblance to 
the colony-stock of a Hydroid zoophyte, such as Coryne , is suggested. The 
organism consists, in a like manner, of an adhesive creeping rhizome, 
which gives rise to erect ramifying branches, crowned at their extremities 
with prehensile capitate tentacles. The reproductive bodies are similarly 
represented by two distinct structures, those of the first order consisting 
of ovate, mouthless ciliated bodies, comparable to the Planula larvae of a 
Hydrozoon, which are developed within excrescences of the main trunk. 
Embryos of the second order, bearing tentacles, and more nearly resem- 
bling an adult Aciuetan, are produced as buds from the extremities of 
the branchlets. These are, in a like manner, likened to the tentaculifer- 
ous medusiform gonophores of the Hydrozoon. Dendrosoma is further- 
more cited as the only example among the Infusorial series in which the 
individuality of the component zooids is so far obliterated, that the colony- 
stock may be justly described as a homogeneous multicellular organism, 
having, as in a Hydrozoon, a common nutritive fluid circulating through- 
out the creeping rhizome and ramifying branches. 
The following families and genera are recognized : — 
Div. a. Tentaculifera-suctoria. Fam. i. Ilhynchetidce (genera, 
Rhyncheta , Urnula). Fam. ii. Acinetidce (genera, Sphcerophrya , 
! Tricliophrya , Podophrya , llemiophrya , Podocyathus , Solenophrya, 
Acineta). Fam. iii. Dendrocometidce (genus, Dendrocornetes). 
Fam. iv. Dendrosom\at\idce (genus, Dendrosoma). 
Div. b. Tentaculifera-act inaria. Fam. i. Ephelotidce (genera, 
Ephelota, Actinocyathus). Fam. ii. Ophryoclendridce (genera, 
Ophryodendrum, A cinetopsis). 
New genera and species introduced '.—Sphcerophrya stylonychice , Podo- 
phrya wrzcsniowslcii , mollis , buclcii. 
Hemiophrya , g. n., p. 822. Founded on Podophrya gemmipara, Hertwig ; 
distinguished from typical Podophrya by possession of tentacles of two 
orders, in part suctorial, and in part simply prehensile. Includes in 
addition, Podophrya truncata, Fraipont, P. crustaceorum, Heller, P. pu- 
silla, Koch, Hemiophrya microsoma and II. thouleti , Maupas. 
Podocyathus , g. n., p. 827. Develops a stalked lorica, as in Acineta , the 
tentacles of two orders, as in Hemiophrya. P. diadema , sp. n., from 
salt-water. 
A cineta grandis and stellaris, spp. nn. 
Actinocyathus, g. n., p. 848. Differs from Ephelota in secreting a pedi- 
cellated lorica. A. cidaris , sp. n., from salt-water. 
Ophyondendrum porcellanum and multicapitatum , spp. nn. 
