CLAVAGELLA. 



Lam. Hist. Nat. des iVnim. sans vert. 



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VAGINA tubulosa, testacea antic^ atteniiata et 

 aperta, postiee in clavam ovatam, siibcompres- 

 sam, tiibuiis spiniformis irregularibus echinatam 

 terminata : clava alteram valvam parieti infixam 

 alteram intra tubiim liberam exliibente. 



Lamarck tells us that Clavagella is evidently intermediate 

 between the Aspergillum and Fistulana;'' and we are happy 

 to have it in our power to confirm this observation^ for 

 it is to the partial resemblance between Aspergillum and 

 Clavagella that we are indebted for the discovery of the 

 only recent specimen of this latter Genus that we know 

 o.f ; a discovery which we were favoured with the oppor- 

 tunity of making through the liberality of our obliging 

 friend John George Children^ Esq. at the British Museum. 

 We had long since observed the likeness between the open 

 end of the specimen engraved in our plate and the same 

 part of the tube of Aspergillum, and this likeness was so 

 great, that we actually took it for a specimen of an As- 

 pergillum enclosed in a mass of stone, and consequently 

 directed our principal attention to the lower part, when, 

 upon removing some of the earthy matter wiiich sur- 

 rounded it, we were not a little gratified at finding one 

 valve loose in the clavate part of the tube, and tracing 

 the edges of the other attached to the inner surface of 

 the tube. The discovery is the more interesting to us, 

 inasmuch as we are thereby confirmed in our opinion 

 respecting the natural affinity of Aspergillum with La- 

 marck's other TubicoUes; not only in structiire, but al&o 



