PETRIFACTIONS. 109. Helmintholithus. 345 
hidis. The Ifis or Coral. 
1. The Ifis Hippuris, , . j 
The fingle joints are often found in England, Sviitzjrland an 
Sicily. 
2. The Ills Entrocha. 
Helminth. Entrochites. Syst, nat, xli. 3./. t68. n, 17. 
Afteria columnaris. Harenh. encrin. 8 -lO. 
Entrochus. Volm. Sile/. i. tab. 2 J, bg.^j lo. 
Found in England. nd aim ft every part of the continent fome- 
times in fitgls fepa rate joints, fomeUmes 
into a column, from the fize of » P‘" ® ^ ^ K J 
length and the thicknefs of the middle -finger: they are more 
or lefs tranfparcnt in proportion as they contain more or lels 
filica, are ftriated from the centre to the circumference an 
have a cavity in the middle. When powdered they are el- 
teemed very powerful diurdics, and are exhibited in nephn- 
tic cafes; the dole being as much as will lie on a Ihilling. 
a. Smooth, with the margin nearly entire. 
b. Smooth, with the margin undulately fcalloped. 
c. Waity. 
d. Prickly. 
e. Dotted. 
f. Tranfverfelv ftriate. 
g. With the joints elevated.- 
h. Br nchert in a forked manner.- 
3 The MaV.rc pora Afteria. 
a Viih the angles more or lefs obtufe. 
H ■ minthol. Aileria. ^y/l. nat. xii. J.p. i68, ». 1 8, 
M idiolus ftellatus. Schiach Helm. lO. fig- 
Modi' lus ftellatus. Eang. fig.Ej tab. \c)f.z. 
Afteria pentagona. Roftn Hell 35. rao. 5- 
Afteria columoa. Gefner fig 37 * rolkni.filefi.ttZi.ffZZt 
Lluyd lithop. Brit. tab. 1 3. Z2. 
b With the angles acute. 
Helminthol Stella. Syft nat. xii. 3. p- ibg. n. 19. 
Lapis judaicus. H''agn. Judaic, w. fig- z?- 
c. Orbicular. 
d. Orbicular at one end and angular at the other, 
VOL. VU. — X X 
Star-Hone, 
