2 2 7 



was conical, with a rather small opening. The shell was almost entirely coverecl by a yellowish 

 tough coat, which covered the stick also. The coat being taken off, a transparent white specimen 

 appeared, which, however, feil to pieces on being touched; it must have been dead on being 

 dredged : the animal itself is wanting and of the opercula, only one of the scuta was present. 

 This resembles in shape and by its distinct growth-ridges the same valve of B. investitus 

 from Station 310. This is also the case with the calcareous basis, the rather broad alae, and 

 the narrow radii. The specimen was collected at : 



Stat. 260. December 16 and 18, 1899. Lat. 5°36'.5S., Long. I32°55'.2E. 2.3 miles N.W. from 

 the North point of Nuhu Jaan, Kei-islands. Depth 90 m. Bottom: sand, coral, 

 and shells. 



24. B. cornutus n. sp. PI. XXIII, fig. 12 — 16. 



Carino-lateral compartment wanting. Rostrum elongate. Lateral compartments and basis 

 growing out into lateral horns, the cup-formed basis terminating in four excrescences. 



This remarkable form is represented by a single specimen. It belongs doubtless to the 

 same group or section as B. calceolus and B. navicula, and in outward shape comes nearest 

 to B. galeatus. 



The shell is conical, elongate in the rostro-carinal axis, vet at the same time broad in 

 consequence of the lateral outgrowings of the lateral compartments (PI. XXIII, fig. 12 and 13). 

 The orifice is rounded, slightly elongate and pointed at the carinal end. The carino-lateral com- 

 partments are wanting; the four radii, with their broad summits, which are parallel to the basis, 

 are white and stand off very distinctly from the beautifully yellowish-red-coloured parietes. The 

 shape of the radii is triangular, the alae are narrow, with nearly parallel margins. The lateral 

 compartments and the carina show darker red-coloured longitudinal stripes, the colour of the cup- 

 formed basis is darker in the middle and lighter towards the circumference, with concentric lines 

 in the central part which are crossed by somewhat darker stripes extending from the centre to the 

 circumference. The carinal half of the basis is free, the rostral half has a longitudinal furrow which 

 is occupied by the stem of the organism to which it is attached. Parts of a yellowish-coloured 

 very hard and horny epidermis are here and there attached to the surface of the shell. 



Scutum (PI. XXIII, fig. 14, a and r) distinctly convex, with rather prominent growth- 

 ridges. Basal margin sinuous. The articular ridge occupies two thirds of the length of the tergal 

 margin, it is reflexed, but narrow. The adductor ridge is confluent with the articular ridge in 

 the upper part and quite indistinct in the lower part. 



Tergum (PI. XXIII, fig. 14, b and d) with the apex pointed but not produced. There 

 is no longitudinal furrow, and the spur, the width of which is about half that of the whole valve, 

 has the lower end obliquely rounded. The scutal margin is nearly straight; there is hardly 

 any distance between the basi-scutal angle and the spur. The basal margin is slightly hollowed 

 out on the other side of the spur. Crests for the depressor muscle very feebly developed. 



Regarding the body of the animal only the following can be said 1 : 



1 Mouth and first pair of cirri were lost through an accident (boiling-over of the solution of caustic potash). 



99 



