1S81.] 



TltE SURVEY OF H.M.S. ' ALERT.* 



131 



in space by the natural barriers (wide and deep seas) which serve to 

 break up such groups as the marine Molhisca and Crustacea into a very 

 great number of comparatively distinct faunse. In this collection, 

 all the species but one have been assigned to genera aheady known 

 from the North Atlantic, and three of the four already described 

 species which occur in it were previously known as West-Indian forms, 

 while the species most nearly related to the new species are chiefly 

 Atlantic. When the Pacific sponges are as well known as those of 

 the Atlantic, we may expect, looking at the geographical relations be- 

 tween this district and the Pacific, to find a considerable though pro- 

 bably much slighter resemblance between them and the Magellan 

 forms. No detailed descriptions have been hitherto published of 

 any New-Zealand sponges ; so that such descriptions will be received 

 with much attention when they appear, considering the intimate re- 

 lations which the Vertebrate and Invertebrate faunse of that district 

 bear to that of the one at present under consideration, as far as they 

 have been investigated. But indications are not wanting of a close 

 connexion between the sponges of the two localities. 



The results arrived at by comparison of the species found here 

 with allied forms from other parts of the world may be conveniently 

 arranged thus : — ■ 



Sjjecies already knowu. Present locality. Originally described as 



Original locality. 



Hircinia kispida^ ^ S.W. Chili. 



Lamk. 

 ^ Cladochalina armigera, Off E. Brazil 



Sdt., var. pcrgamen- 



tacca. 



Eeniera fortior, Sdt.? St. of Magellan. 

 Schmidfia aulopora, S.W. Chili, 



Sdt., var. 



; Spongia hispida, La,mk, 

 I C. armigera, Sdt. 



R. fortior, Sdt. 

 8. aulopora, Sdt. 



"Southern Seas." 

 Florida and Antillea. 



Antille.''. 



W. Indies and Florida, 



New sptcies. 



Localitv. 



Jvlgsina ? regularis. 

 ' Ckalina coppingeri. 

 Siphotiochalina fortis. 

 Phakellia egrcgia. 



Ciocah/pfa calva. 

 Espcria mageUanica. 

 Alehion lyTOximicm. 



St. of Magellan. 

 Off E. Brazil. 

 S.W. Chili. 

 St. of Magellan. 



St. of Magellan, 

 St. of Magellan 

 St. of Magellan. 



Nearest described allies. ! 



I 



Localitv. 



Hymedesmia poUta. \ St. of Magellan. 



Trachytedaniaspinata, 

 Tedania tenuicapUata. 

 ' Vioa carter i. 



Species undetermined. 

 Amorpkines sp. 



S.W. Chili. 

 S.AV. Chili. 

 Off S.E. Brazil. 



Not determined. 

 C. gradient a. Bowk. 

 & bullcda, Sdt. 

 Axinella cin namomca, 



Sdt. 

 C. leei, Bowk. 

 E. nodosa, Sdt. 

 Halichondria p)atter- 



soni, Bowk. 

 Microciona tiibovsOj 



Bowk. 

 Atlantic Tedania. 

 T. svcloria, Sdt. 

 Cliona subulata, Sollas. 



St. of Magellan. 



Britain. 

 West Indies. 

 Mediterranean. 



Britain. 



Adriatic. 



Britain. 



Straits of Malacca 



Atlantic. 

 Iceland. 

 Hab. ? 



' These species cannot be reckoned as belonging to the Magellanic fauna. 



9* 



