HYDROID ZOOPHYTES. 



FAM. TUBULARIIDAE. 



Tuhularia ralphii, Bale. 10-20 fathoms. 

 Tubularia hodgsoni, sp. n. 130 fathoms. 

 Tuhularia hngstaffii, sp. n. 124 fathoms. 



FAM. CORYNIDAE. 

 Two undetermined species. 0-20 and 106 fathoms. 



FAM. COEYMORPHIDAE. 

 Lampra parvula, sp. n. 10-20 fathoms. 

 Lampra mwrorhiza, sp. n. E. end of Barrier. 300 fathoms. 



FAM. MYRIOTHELIDAE. 

 Myriothela (?). 



CALYPTOBLASTEA. 



FAM. SERTULARIIDAE. 

 Sertularella spiralis, sp. n. 130 fathoms. 

 Sertularella plectilis, sp. n. 0-130 fathoms. 

 Dictyocladium fuscum, sp. n. Coalman Island. 8-15 fathoms. 



FAM. PLUMULARIIDAE. 

 Plumularia glacialis, sip. n. E. end of Barrier. 100 fathoms. 



FAM. CAMPANULARIIDAE. 

 Sub-Fam. Campanulaeiinae. 

 Campanularia verticillata, Linnaeus. New variety. 10-20 fathoms. 

 Gampanularia everta, Clark. 0-20 fathoms. 

 Campanularia laevis, Hartlaub. 0-20 fathoms. 



Sub-Fam. Haleciinae. 



Halecium arloreum, AUman. E. end of Barrier and McMurdo Bay. 0-130 fathoms. 

 Halecium tenellum, Hincks. 10-20 fathoms. 



Sub-Fam. Lafoeinae. 

 Lafoeina longitheca, Jaderholm. 0-20 fathoms. 



FAM. EUCOPIDAE. 

 Olelia geniculata, Linnseus. 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 diff'erent 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 



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