286 



** Coral simple, with simple branches spreading on all aidės. 



2. Primnoa antarctica. 



P. antarctica, Valenc. Voy. Venus, t. 12. f. 2. 

 South Polar Sea and Falkland Islands. 



2. Callogorgia. 



Coral forked, fan-shaped ; branchlet pinnate. Axis continued, 

 Stony, compressed. Bark thin, white, formed of flat angular im- 

 bedded granules. Cells in whorls of three, cylindrical, incurved, 

 covered with small imbricate scales. 



1. C. VERTICILLATA. B.M. 



Gorgonia verticillaia, Palias ; Esper, t, 42. 



G. verticillaris, Solander. 



Prim. verticillata et P.flabellutn, Ehrenb. 



Mm-icea verticillaris, Dana. 



Keratophyte (Sea Feather), Ellis, Corall. t. 20. f. S. T. T. 



Mediterranean ; Madeira. 



■^ Primnoella. 

 Coral simple, elongate, cylindrical. Axis continued, stony. Bark 

 granular, smooth. Polypiferous cells numerous, close pressed, sub- 

 cyliudrical, regular, small, placed in close regular circles, each con- 

 taining many cells round the stem ; each cell covered with two series 

 of small imbricate scales. 



I. K' Prim^oa-australasi^. B.M. 



Primnoa australasice, Gray, P. Z. S. 1849, 146; Radiata, pi. 2. 

 f. 8, 9. ^ 



Australian Seas, on oyster-shells and stones. 



Fam. 5. Corallid^. 



Axis inarticulate, solid, calcareous, more or less hard and stony. 

 Bark smooth, granular, with irregular-shaped calcareous spicula. 

 Polypiferous cells simple, more or less exserted. 



The chemical character of the axis may be easily discovered by a 

 small quantity of muriatic acid. 



1. CORALLIUM. 



Corallium, Lamk. 1813. 

 Isis, Oken, 1815. 



Coral tree-like, hranched, forked. Axis hard, continuous, stony, 

 striated externally. Bark granular, when dry formed almost entirely 

 of irregular spicula (see Ellis, Zooph. t. 13. f. 3, 4). Polypiferous 

 cell homogeneous, scarcely exserted, scattered over the surface of the 

 branches. 



