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 of a Byffus. In fpeci- 

 mens lately received, preferved in fpirits as they were 

 taken out of the fea, thefe fine fhort reddifh hairs 

 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 fhops 

 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 Coralline. ■ Tab.2*. 



Fig. 2, 



Corallina dichotoma^ Dichotomous Coralline with 



artkulis oblongo-ovatis u- joints that are of an oval ob- 

 trinque rotundatis fub- long figure, rounded at both 

 comprefts. ends, and a little compreffed. 



Tab. 22. Fig. 2. 



Many of thefe Corallines, when dried, become com- 

 preffed ; 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 rouad. 



This was brought from the Bahama Iflands. 



Q^ 10. Corallina 



