parietes and basis meet in an elegant flexuous line. The margins of the different valves and the 

 colour of the surface appear only after the Gorgonia is taken away from the surface. 



The carina is narrow at the upper extremity and much broader below; the carino- 

 lateral is narrow, its breadth even climinishes from the basis to the upper end; the la ter al 

 is triangular, the rostrum is much elongated, as can best be seen from the figure. The 

 radii are well-developed, increasing in width from the basis upwards, striated horizontally, their 

 summits almost parallel to the basis; the alae seem to have oblique summits. 



The scutum (PI. XXIII, fig. 18, a and c), is narrow, its basi-tergal angle not so 

 much rounded off, as, according to description and figure, is the case in that of B. cymbiformis. 

 The articular ridge is well-developed and extends over half the length of the valve, it is 

 distinctly reflexed. Pit for lateral depressor nurscle hardly visible, cavity for adductor muscle 

 somewhat more distinct. The teeth of the occludent margin are strongly developed. 



The tergum (PI. XXIII, fig. 18, b and d) is broad, the outer surface beautifully and 

 delicately furrowed horizontally, and not flat but flexuous. The spur is broad, its basis obtusely 

 pointed. It is limited by an extremely shallow longitudinal furrow towards the scutal side of the 

 valve. Crests for the depressor muscle hardly visible. 



The investigation of the animal's body gave the following results : 



Mouth. Labrum (PI. XXIII, fig. 19): notch triangular, wide, lateral parts nearly 

 quadrangular, breadth of the sub-triangular shield greater than its height. Three teeth on each 

 side of notch, and these are not pointed, but somewhat rounded at the extremity. On one side 

 a tooth is wanting. 



Pal pi: oval, the upper margin not quite so strongly convex as the lower. Hairs on 

 the outer surface not very numerous, forming an irregular group, some of them uniting to 

 form a tuft, with hairs seen along free extremity. Hairs along upper margin rather numerous, 

 those on inner surface also numerous and well-developed. 



Mandible (PI. XXIII, fig. 20): with five teeth, and the lower angle rounded off. 

 Third tooth massive, 4 th and 5" 1 rudimentary, with rounded extremities. Distance between 

 extremities of teeth 1 and 2 hardly greater than that between the extremities of teeth 2 and 3. 



Maxi 11a (PI. XXIII, fig. 21 ancj 21*): small notch below upper large pair of spines ; 

 a delicate spine situated at the bottom of the notch. Upper spines stronger than lower pair; 

 between the two pairs 3 somewhat shorter spines are seen along the edge in the one maxilla, 

 and 4 in the other. The latter spines diverge from the plane of the maxilla. 



Outer maxillae (PI. XXIV, fig. 1): outer lobe with straight inner and curved outer 

 margin and the extremity obtusely pointed. Numerous hairs on distal half, a single row extending 

 towards inner lobe, which is covered on its inner half with a group of feathered hairs which 

 are directed inwards and downwards. 



Cirri. First pair, branches very unequal, of 7 and 14 segments. The shorter ramus 

 has five of its segments distinctly protuberant. the longer ramus has about 8 such protuberant 

 segments. Protuberances bear dense tufts of hairs. 



Second pair, branches slightly unequal, of 8 (indistinctly 9) and 10 segments. Hairs 

 form dense tufts disposed perpendicularly on long axis of cirrus. 



