PETRIFACTIONS. 109. HeJmintholithus. 
with a vsrv cowex, rougliifli, often 3 parted fliell feirilon*' 
on the fnre-part, grooved its whole length, with 2 hen'il- 
pherical or cylindrical tubercles above on the fides: tronfc 
cylindrical, 3-lobed, covered with a laminar (hell confiftif? 
of verfatile triarcuated rings : tail thin, 3-parted by 3 
bercles. 
S09. HELMINTHOLITHUS. The body, of 
parts, of a cruftaceous worm or flicll-fifli change‘s 
into a foflile fubftance. 
The ftar-fifh or its parts. 
I. The Alierias pappofa. 
fn ilaty iimefloncat Pappenhtim. 
2i The Alierias rubens. 
In &. PeUr'j mjuntatK near MteJlriH. 
3. The Alierias tninuta, 
Helmiotholithus Aftrion. Syft. nat, *ii. 3. f. 166. «. 1 1. 
Aiirian, Sea liar. Berkenh. fympf. p. zyz, 
A&rion. Plot. Oxfordjb. 85 a, i6. 
Found in chalk pits in various parts of Englasd, minute, red' 
dilh'whitc, in form of a liar or wheel with 4 or j radii* 
fomewhat convex in the centre. 
4. TheAfleriasglacialis. 
In Fratia near Midt/tse. 
5. The ASerias reticulata. 
In Fratue near ChsJJmi on rise Sotme, 
6. The A&ertas aurandaca. 
IF^aicb. Stdnr, 1. p. 107, 108. tab. z. «. I. ' 
7. The Alicriiis cqaeltris. 
in fandSones in baxony. 
8. The Alierias o^iura. 
In half rad Germoof in marble, and with folitary rays at Rat' 
ttabttrgt and near Heasehirg in a yellow fliining fanddone. 
9. The ASerias peainata- 
At PapptKieiat in flaty limc&oiie. 
to. The A&erias muhitadiata. 
Helndnoliihas alveolatus. %?. nat. xii. p. 166. 
Near Staatgowd, with the rays aggrcgatc- 
I I. The Alierias Caput Medufae. 
Thefe arc found generally in mountains of chalk, limelloos 
fand&onc, fometimes the mere impreffions. 
