RErORT ON CORALS — DEEP-.SEA MADREPORARIA. 179 



I give here a woodcut of a specimen dredged by the " Porcupine " Expedition, taken 

 from Sir C. Wyville Thomson's Depths of the Sea. 



A large number of the specimens dredged off Nightingale Island were living. The 

 animal was of a uniform dead-white colour, without any pinkish tinge. The mouth is 

 circular, with twelve small plaits at its margin. There are twenty-four tentacles arising 

 from the inner margins of the primary, secondary, and tertiary septa. The tentacles 

 borne by the primary and secondary septa are carried erect whilst the animal is at rest 

 in the expanded condition, whilst those of the tertiary are held more horizontally or 

 are recurved. The tentacles are long and attenuated, terminating in a very slight knob. 

 An elevation or ridge formed by the soft parts leads from the base of each of the 

 primary and secondary tentacles to the margin of the mouth. 



Two small fragments of this coral were obtained in two dredgings off the Virgin 

 Islands. One of these is figured on Plate VIII. figs. 7, 8. They agree in having the 

 calicles very short, and at first I thought of referring them to a variety under the term 

 braclvjcephala, but I find closely similar bits amongst the branches of some of the large 

 specimens obtained off the Tristan da Cunha group. Another similar dead fragment was 

 obtained off St Paul's Eocks. 



Station 23, off Sombrero Island, Danish West Indies. 450 fathoms. A small 

 fragment. 



Station 24, off Culebra Island, Danish West Indies. 390 fathoms. A similar 

 fragment. 



Station 109, off St Paul's Eocks, Equatorial Atlantic Ocean. 100 fathoms. A dead 

 fragment. 



Station 135, off the Tristan da Cunha group. Off Inaccessible Island. 90 fathoms. 

 Off Nightingale Island. 100 to 150 fathoms. Very large quantities of fine specimens. 



Lophohelia Candida, n. sp. (PL IX. figs. 6-13). 



The corallum is of a pure white. It branches irregularly, the branches being often 

 curved. It encrusts various objects with its base. The surfaces of the branches are 

 smooth, but marked by very faint, broad, longitudinal tracts. The gemmation is 

 regular and distichous. The mouths of the calicles are small, with a slight border of 

 costse round their margin in young specimens. There are six systems and three com- 

 plete cycles. The secondary septa are markedly smaller than the primary. The septa 

 are never exsert. As growth proceeds an abundant ccenenchym is developed which 

 buries the originally long and slender calicles, and forms thick stems (fig. 12) somewhat 

 compressed in shape, on the sides of which the small mouths of the calicles are seen in 

 rows barely prominent beyond the surfaces of the ccenenchym. There is no columella. 

 This species is closely allied to Lophohelia ramea and Lophohelia (= Amphihelia) ocidata, 

 as described by Professor Duncan. After comparing my specimens with his, I think it 



