Order IV. AXIFERA, G. von Koch. 



Family Pbimnoid.e. 



Sub-family Primnoinse. 



GENUS CALIGORGIA, Gray. 



Caligorgia indica, Thomson and Henderson. 



To thi.s species we refer several fragments from two different localities. 

 The largest is 80 mm. in length and 10 mm. in maximum breadth, while another 

 is 40 mm. in length and 10 nun. in breadth. The axis is iridescent and bears 

 longitudinal ridges and grooves. The branching is dichotomous in one plane. 

 The polyps occur in whorls of two or three, the latter number being more frequent, 

 probably owing to the fact that the specimens are but terminal fragments. For 

 a comparison between this species and C. mrticUlata, Pallas, and C. similis, 

 Versluys, see " Alcyonarians of the Indian Ocean," Part I. p. 43. 



Localities : Andamans, 270-45 fathoms, and Laccadives, 30-50 fathoms. 



Previously recorded from Andamans, 270-45 fathoms. 



Family Isid.-e. 



Sub-family Isidinaj. 



GENUS ISIS, Linnffius. 



Isis hippuris,' Linnaeus. Plate VI. figs. 1, 2 and 3. 



The genus Isis was established by Linnaeus in 1737 in his " Hortus Clif- 

 fortianus," p. 479, )iut he did not then include under the genei'ic appellation 

 the species to which it was afterwards applied. These he referred to the genus 

 Sertnhrria. In his " Systema Naturae," ed. x., 1758, p. 1287, Linnaeus rearranged 

 his species, and placed in the genus Isis not only the species referred to, but also 

 all the Isidinaj, " le Corail " as well as the Encrinites. Pallas, in his " Elenchus 

 Zoophytorum," 1766, accepted the classification of Linnaeus and gave the follow- 

 ing generic description : " Colony arborescent, sedentary ; axis calcareous, 

 porous with longitudinal striations, or jointed, bearing a fleshy cortex ; verrucae 

 sparsely scattered ; polyps flower-shaped, oviparous, with a crown of tentacles, 



^ The account of Isis hippnris and of the history of the genus Isis is due to Mr. Simpson : 

 see " Journ. Linn. Soc." (Zoology), xxxvii. (1906), pp. 421-33, 1 pi. 



180 



