USt OF SCOTTISH VERMES. - 561 

 &ORGONIA. 



G. flabellum. Leith Shore j found by the late 

 Mr Mackay. 



Tubipora. 



T. catenularia. Orkney and Shetland islands, 

 serpens. Ibid. 

 fascicularis. Ibid. 



Spongia. 



S. ventilabruniy Lin. ? In the islands of Unst and 

 Fulah, I picked up several specimens of a 

 sponge, which agrees in many characters 

 with the Spongia ventilabrum of Linnaeus* 

 It has the reticular woody veins, the same 

 kind of spongy covering, and the same ge- 

 neral fan-like shape as the Sp. ventilabrum. 

 The reticular woody fibres point out this as 

 one of the species by which the Sponges are 

 connected with the Gorgonias. It is said 

 by some naturalists, that certain varieties of 

 this species are funnel-shaped : it would 

 seem, however, that these supposed varie- 

 ties belong to a distinct species, which may 

 be characterized thus : Spongia Zetlan- 

 dica, Denis lignosis reticularis, obtectis poro 

 favagineo. This funnel-shaped sponge is 

 distinguished from Spongia infundibulifor- 

 mis of Linnaeus, by its reticular woody 

 veins, which are wanting in the other, and 



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