45 



Characters of Alcock's Species. Characters of C. similis. 



b. On I centimetre length of a twig b. On 1 centimetre there are 7 or 8 



there are 8 or 9 whorls of poh -|> .-. whorls. 



c. The length of the contracted polyps c. The length of the contracted polyps 



is 075 mm. or less. is somewhat larger ; it varies gener- 



ally between 075 and 0'81 mm., 

 but sometimes rises to 1 mm. 



d. The distance between two whorls d. This distance is somewhat less ; it 



varies generally between 0'4 and varies between 0'3 and 0'5 mm. 



0'9 mm. 



e. In the polyps the abaxial rows consist e. The same number of scales is found 



of 7 scales, the outer-lateral rows in the abaxial rows, but the outer- 



of 3 scales only (2 distal scales and lateral rows are reduced to only 



a basal, or perhaps 2 basals). one distal scale. 



f. Of the scales of each abaxial row only f. Of each abaxial row the 5 proximal 



two are extended over the sides of scales are extended over the sides 



the polyp ; sometimes a third scale of the polyp and replace the missing 



also shows a smaller lateral ex- outer-lateral scales. 

 tension. 



The sum of these differences is, I think, of sufficient importance to warrant 

 us in regarding Alcock's species as different from Caligorgia similis. The two 

 species are, however, very closely allied. The scales in the polyps and the cceneii- 

 chyma are of the same type. 



C. indica differs from C. versluysi in the smaller number of scales on the 

 polyps. Each abaxial row is formed by 7 scales only, against 10 or 11 in C. 

 versluysi, each outer lateral row by 3 scales against 5. The habit of the two is 

 the same, and it is not impossible that C. indica is only a variety of C. versluyxi." 



Locality : Andamans ; 270-45 fathoms. 



Caligorgia dubia, n. sp. 



A single fragment 7'9 cms. in height and 1'6 cm. in width. 



The branches arise in one plane from the opposite sides of the chief axis. The 

 distance between the origins of the branches varies considerably, from 6 '5 to 

 13 '5 cms. 



The axis is slender (1 mm. in diameter at the base, thread-like at the tips 

 of the branches), flexible, almost cylindrical, and marked by longitudinal ridges. 

 It is horny in texture, shows concentric layers, and is abundantly impregnated 

 with lime. The colour is yellowish, darker in the angles between the chief axis 

 and the branches. 



