34^ PETRIFACTIONS. 109. Helmintholithus. 
In England, Snuitxerland, Germany, Aujiria, &c. itngle or g're- 
ganous, detached or fixed, with the joints folitary or form- 
ing a column which is rarely curved or branched, fmooth or 
warty, rarely 3 or 6-fided, very rarely fqUare: the joints 
when feparated refemble a radiated ftar; when placed in 
good vinegar they hive the property of moving, which is 
merely occafioned by the efFervefcence caufed by the acid ail- 
ing upon the calcareous matter of which they are compofed. 
4. With the divifions diflant, orbicular, and connedled by a cen- 
tral thread, 
Syiti nat. xiij 3. />. 170, n 24. Hamh. mag. 9. p. ■73. 
Near Briftol and in Derbyjhtre, in the Harz and various parts of 
Germany^ in marble or quartz or flint, and often containing a 
a large portion of oxyde of iron. 
5. Turbinate, with a y-fided 5 toothed bordet. 
Syj). nat. xii. 5./. 169. n. 22. 
Carpolithus. Muf. Ttff. 96. tab. 4. fig. 2. 
Caryophyllus lapideus. yegel mineral. 234, 
On mount Randberg in Switzerland, detached, of various fizes, 
and fometimes on a ftem. 
Gorgenia, The Gorgonia. 
1. Branched. 
In the principality of Neocomum,- marmoreous. 
a. The Gorgonia nobilisj 
In Switzerland, and near Verona in Italy. 
2. Reticulate, 
^t^Drefden la Saxony, and Cofors in Bohemia, in marl or fwine- 
ftone ; fometimes only an impreffiion. 
Alcionii, The Alcyonium. 
1. The Alcyonium arboreum. 
In England, Bohemia, and Auftria. 
2. The Alcyonium exos. 
In the Netherlands, Germany and Switzerland^ calcareous, en- 
tire or in parts. 
3. The Alcy.inium digitatum. 
In Switzerland .aii Bafil, marmoreous. 
4. The Alcyonium Lyncurium. 
On mount Randberg in Switzerland. 
5 The Alcyonium Burfa ? 
Near Pfefimgen in Switzerland. 
6. The Alcyonium Cydonmra. 
Near P/eJ/mgen in Switzerland, 
