C O R A L L I N A. 113 



There are two varieties of this Coralline, one that is 

 always dichotomous, Tab. 22. fig. 9. and another that 

 fends out three or more joints from the fame place, 

 Tab. 21. fig- g- The fine hair-like down, when magni- 

 fied, looks like the beginning or a ByfTus. In fpeci- 

 mens lately received, preferved in fpirits as they were 

 taken out of the fea, thefe fine ihort reddifh haks 

 come out in regular whirls, or circles, one above an- 

 other, out of the pores in the calcareous furface of the 

 Coralline. 



If we examine the figures of the Coralline of the (hops 

 that are reprefented magnified, after the calcareous coat 

 was taken off" by vinegar (fee fig. A. and C. tab. 24. Ef- 

 fay on Corallines) we fhall find the fame kind of circular 

 rows of fibres, one above another, as in this ; fo that it 

 appears as if this Coralline in its prefent ftate was pro- 

 ducing another calcareous layer over its former one. 



9. Corallina obtufata. Oval jointed Corallitie. Tab. 22. 



Fig. 2. 



Corallina dichotoma, Dichotomous Coralline with 



articulis oblo?igo-o<vatis u- joints that are of an oval ob- 



tri7ique rotiwdatis fub- long figure, rounded at both 



compreffis. ends, and a little comprefTed. 



Tab. 22. Fig. 2. 



Many of thefe Corallines, when dried, become com- 

 prefTed ; but from the appearance of many kinds which I 

 have received in fpirits juft as they were taken out of the 

 fea, they are perfectly round. 



This was brought from the Bahama Iflands. 



Q^ 10. Corallina 



