4G4 
ccelenterata. 
Gymnoblastea. 
The general portion of the second and concluding part of Allman’s 
monograph (1) of the tubularian Ilydroids contains the following chapters : — 
1. On the distribution of Hy droids in space and time, with discussion of the 
nature and affinities of Graptolites {Oldhamia, Palceocorynej and Corynoides 
are not accepted as fossil Ilydroids) and a review of the fossil hydroid Me- 
dusa } 2. On the classification of the Hydroida, viz. 5 suborders, Eletithero- 
blastea {Ilydra)^ Gymnoblastea, Calyptoblastea, Monopsea {JEyinidce), and 
Rhabdophora (Graptolites, &c.) ; 3. On the homological relations of the Cte- 
lenterata ; 4. Teratology and Pathology (arising from parasitism and other 
abnormal conditions) j 6. Anatomy of special forms — Tubularia indivisa, Co- 
ry niopha nutans, ClavateUa prolifera, Cladonema radiatum, Ilydractinia echi- 
nata, Gemmaria implexa, and Diooryne confer ta j 6 . Supplementary notes on 
Cordylophora, Protohydra, &c. 
The following is a summary of the systematic portion of Allman’s mono- 
graph : — 
1. Clavidje. Hydrocaulus rudimental or developed ; hydranths with 
scattered filiform tentacles j gonophores fixed sporosacs. 
Clava squamata, Miill., and midticornis, Forsk., Northern Seas, diffusa, 
Alim., Shetland, kptostyla, Ag., North America, Lancashire, nodosa, Wr., 
Fritli of Forth . 
Rhizogeton fusiformis, Ag., Massachusetts. 
Cordylophora lacustris, Alim., fresh or brackish water. Northern Europe, 
albicola, Kirchp., P. Elbe. 
Tubiclava lucerna, Alim., Dublin, Torquay, Alim., Tenby. 
Merona cornucopice, Norm., Shetland. 
2. Turbid^. Hydrocaulus rudimental or developed^ hydranths with 
scattered filiform tentacles ; gonophores medusiform j planoblasts with simple 
radiating canals, and single marginal tentacles. 
Turris neglecta, Less. (Clavida gossii, Wr.), European Seas. 
Campaniclava daodorce, Gog., Sicily. 
Corydendrium parasiticum, Cav., Naples. 
3. CoRYNiDAS. Hydrocaulus, developed j hydranths with scattered or more 
or less spirally disposed capitate tentacles; gonophores fixed sporosacs. 
Coryne pusilla, Gfirtn., British shores, vermicularis, Hincks, Shetland, va- 
ginata, H., British shores, frtdicosa, IL, Exmouth, ramosa, Sars, Norway, 
ccespes, sp. n., Alim., Spezzia, Also, doubtfully, C. nutans, sp. n., Alim., 
Shetland, scssilis, Gosse, Ilfracombe, ramosa, Cham. Eys., English Channel, 
and (indeterminable) C.Jilifera, amphora, proUfica, Gosse, from floating 
seaweed. 
Actinogonium (g. n.) pusillum, Van Ben., Belgium {cf. Zool. Rec. viii. p. 471). 
4. SYNCORYNiDiE. Hydrocaulus developed or not ; hydranths with scat- 
tered or partly verticillate capitate tentacles, gonophores medusiform plano- 
blasts with 4 radiating canals, and simple (rarely undeveloped) marginal 
tentacles. 
Syncorgne sarsi, Lov., Norway, Cattegat, loveni, Sars, Norway, gravata, 
Wr., N. Berwick, Frith of Forth, mirabilis, Ag., N orth America, 
Alim., Frith of Clyde, decipiens, Duj., L’Orient, fridescens, Alim., Dublin, 
eximia, Alim., British shores, ferox, Wr., Frith of Forth, reticulata, Ag. 
S. listei'i,johnstoni, and Zoyewi, Van Bened., and C. rosaria, Ag,, are doubtful. 
