1909.] N. Annandai^e : The Indian Cirripedia Pedunculata. 69 



SYSTEMATIC ACCOUNT OF THE INDIAN SPECIES. 



Subfamily 0ZyA^/15P/D/A^^. 



Genus Oxynaspis, Darwin (1851). 



Eepadidse with five calcified valves, which are covered (as well as the pedunclç) 

 by a membrane bearing horny spines. The valves themselves bear minute 

 calcareous projections corresponding to the spines. The umbo of the scutum 

 is on the occludent margin. Mandibular teeth sometimes pectinated ; edge 

 of maxilla with an excavation but not regularly scalariform. No lateral 

 appendages ; anal appendages (if present) short, bearing a terminal bunch 

 of hairs, by no means claw-shaped. Prosoma feebly developed or absent. 

 Darwin was of the opinion that the spiny membrane which covers the whole 

 surface in this genus, did not belong to the barnacle but to the horny coralline to 

 which it was attached. Other writers have followed him in this view, which, despite 

 the great weight of his authority, I am forced to consider incorrect after an examina- 

 tion of a considerable number of specimens of an Indian form. Some of these were 

 fresh, others dry, and others preserved in spirit and formalin. The Antipatharian to 

 which they were attached bore no spines on its surface similar to those which covered 

 the barnacle, and the spines corresponded exactly with the calcareous projections on 

 the valves. Moreover, the Antipatharians were of a neutral blackish tint, while the 

 membrane was purplish red. In my specimens the whole of the membrane was ex- 

 tremely thin, and there were no signs of the surface being covered by a '' horny muri- 

 cated bark " — a description, indeed, hardly applicable to any part of the particular 

 species of Antipatharian to which the specimens were fastened. 



Hitherto the genus Oxynaspis has been known from the Atlantic and Pacific. 

 The discovery, therefore, of a species in shallow water in the Bay of Bengal is particu- 

 larly interesting. It must be remembered, however, that the Atlantic species are very 

 rare and that others will probably be found in intermediate localities. 



Oxynaspis celata, Darwin, subsp. indica, nov. 



Capitui^um laterally compressed, sharply pointed and slightly retroverted at the 

 apex, about half as broad as long. The inner membrane deep brownish purple ; the 

 body of the animal and the pedicels of the cirri covered with pigment spots of the 

 same shade; the rami of the cirri, except at the extreme base, milky white. Valves 

 thick, deeply tinged with orange-red ; the spines on the membrane covering them of 

 the same colour but darker ; the surface of the valves ornamented with strong ridges 

 radiating from the umbo and also with numerous minute rounded prominences corres- 

 ponding to the spines on the membrane ; the distal ends of the ridges produced so as 

 to form well-marked rounded projections on the edges of the valves. Ter gum triangu- 

 lar, the apical and carinal angles acute, the occludent angle greater than a right angle ; 

 the extreme length of the valve about twice that of its occludent margin; the 



