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fail to be of future use. The case has been indifferently 

 figured by Pennant. It is remarkable for its uniformity, 

 being perfectly straight, but somewhat conically tubular. 

 It is composed of bits of shells and chosen particles of 

 sand, so arranged as to form an equal surface ; the gluten 

 cementing them together entirely covering the inside, and 

 appearing externally between the particles when examined 

 by a magnifying glass only. There is little doubt but 

 these animals quit their cases, as we have seen fresh water 

 animals with tubular cases do, and dexterously recover 

 them again. Tlie case of this animal, which is called 

 Sahella tuliformis, has with the rest of that genus been 

 placed with the Vermes Testacea ; we do not find fault 

 with this arrangement, as, perhaps, without the animal, 

 there may be no better place for them. 



They are found on the Sandwich and other shores, but 

 the cases are oftener found without the animal than with it. 

 We have not had the pleasure of seeing this animal in its 

 natural situation ; and have therefore placed it as if fallen 

 on the shore, with the animal nearly out of the covering ; 

 the other animal has fallen carelessly on its back : — thus a 

 view is given both of the back and front. The case is 

 said to be found immersed perpendicularly in the sand, 

 with the broad end and head upwards. 



