[ 5° 8 ] 
feemingly weakly infignificant animals; more efpecial- 
ly if, upon thefe very bodies, there were appearances 
of ether chara&eriftics, that, at the fame time, were 
likely to lead me into another arrangement of them. 
I have produc’d here before you fuch of the fhell- 
animals, as are unqueftionably the makers of their 
own houfes, that are furnifh’d with thefe requifites 
mention’d ; and others I fhall now offer you, being 
fomewhat nearer thofe faid to form the coral, &c . 
than other teftaceous kinds. 
The dentalia are tubular fhells, formed from their 
inhabitant animal, as much as a cockle, or an oyfter : 
and we mull obferve, that each of thefe has a fuf- 
ftcient cavity for its habitation, and in itfelfhasthe 
proportional fize and ftrength neceftary for the pur- 
pofe. 
The 'vermicuU marini enjoy the fame privileges, 
and are always attach’d to their fhells at their pofte- 
rior extremities, as well as the others, of whatsoever 
kind. They are found in groups, adhering together 
by a natural cement, blended, and, as it were, con- 
founded together ; and yet every one has its own cell, 
and is fufficient to produce in thofe requifites before- 
mention’d. All the kinds of thefe have one extre- 
mity fmall, and increafe in diameter to the anterior 
extremity ; which is indeed the cafe of all the turbi- 
nated fifh of whatfoever kind. To thefe we may 
add, that the crufts of cruftaceous animals, and 
thofe of infers in their chryfalis ftate, will always 
fhew, how neceftarily an animal muft have power 
and fufticiency to form his habitation, either by fe- 
cretion, or adtual operation. 
The fyringoides , fo call’d from their forms, carry 
the fame teftimonies of their ftrength and power j 
many 
