HYDROID ZOOPHYTES. 
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FAM. TUBULARIIDAE. 
Tubularia ralphii, Bale. 10-20 fathoms. 
Tubularia hodgsoni, sp. n. 130 fathoms. 
Tubularia longstaffii, sp. n. 124 fathoms. 
FAM. CORYNIDAE. 
Two undetermined species. 0-20 and 100 fathoms. 
FAM. CORYMORPHIDAE. 
Lampra parvula, sp. n. 10-20 fathoms. 
Lampra microrhiza, sp.n. HH. end of Barrier. 300 fathoms. 
FAM. MYRIOTHELIDAE. 
Myriothela (?). 
CALYPTOBLASTEA. 
FAM. SERTULARIIDAE. 
Sertularella spiralis, sp. n. 130 fathoms. 
Sertularella plectilis, sp. n. 0-130 fathoms. 
Dietyocladium fuscum, sp. n. Coulman Island. 8-15 fathoms. 
FAM. PLUMULARIIDAE. 
Plumularia glacialis, sp. n. EK. end of Barrier. 100 fathoms. 
FAM. CAMPANULARIIDAE. 
Sus-Fam. CAMPANULARIINAE. 
Campanularia verticillata, Linneus. New variety. 10-20 fathoms. 
Campanularia everta, Clark. 0-20 fathoms. 
Campanularia laevis, Hartlaub. 0-20 fathoms. 
Susp-Fam. HALEcIINAE. 
Halecium arboreum, Allman. E. end of Barrier and McMurdo Bay. 0-130 fathoms. 
Halecium tenellum, Hincks. 10-20 fathoms. 
Sus-Fam. LAFOEINAR. 
Lafoéina longitheca, Jiderholm. 0-20 fathoms. 
FAM. EUCOPIDAE. 
Obelia geniculata, Linneeus. Auckland Islands. 
Campanulina (A). 0-20 fathoms. 
Campanulina (B). 0-20 fathoms. 
THE CLASSIFICATION ADOPTED. 
One of the greatest difficulties that the systematic zoologist has to meet in writing 
an account of a collection of Hydrozoa is the determination of the system of classifica- 
tion that he will adopt. There are so many different opinions as to the relative 
systematic value of the characters presented by the hydrosome and gonosome 
respectively, and our knowledge of the extent of the modification of these characters 
by environmental conditions is so imperfect that every system of classification that 
PATOL YZ 
