179 



in the other ramus. Few (2 — 3) and small teeth (PI. XV, fig. 15) are disposed on the protu- 

 berant parts of the anterior face of some of the middle segments of both rami. 



Fourth to sixth cirrus have the same, or nearly the same structure, the only diffe- 

 rence being that the number of segments increases a little from the 4 th to the 6 th : the number 

 of segments is 13 and 15 in the fourth, whereas the sixth pair has 16 and 17 segments. The 

 oreatest number of spines (PI. XV, fig. 16) observed on the inner face of the segments was 

 tour pairs. The spines disposed on the dorsal surface of each segment, close to its upper margin, 

 are very short in this species. 



Penis not very long, narrow in the distal part. Hairs scattered over surface and forming 

 a little tuft at the extremity. 



The only specimen was collected at : 



Stat. 117. July 12, 1899. Lat. i° o'.5 N., Long. I22°5Ó'E. Kwandang-Bay-entrance. Depth 

 (chart) 80 m. Bottom : sand and coral. 



General Remarks. This species shows resemblance to my new species B. alatus\ the 

 shape of the opercular valves, and the structure of the parts of the mouth as well, is, how- 

 ever, different, and as the two forms, moreover, inhabit quite different depths (B. alatus living 

 at a depth of 564 m. is a real deep-sea species) I think the safest way is to consider and 

 to describe them as different species. 



3. Sectio: Striato-Balanus 



5. B. amaryllis Darwin. PI. XV, fig. 17—21. PI. XVI, fig. 1—4. 



ÜARWIN, Ch., Monograph, The Balanidae, Verrucidae etc. 1854. p. 279, pi. VII, fig. 6. 



Of this species, which, according to Darwin is distinct and well-defined, samples were 

 taken on different occasions : 



I. Stat. 50. April 16/18, 1899. Bay of Badjo, West coast of Flores. Depth up to 40 m. Bottom : 



mud, sand and shells, according to locality. 



A single beautiful specimen, attached to a shell of a small Tridaoia-X\V& oyster. The 

 shape of the shell is conical, the orifice is large, pentagonal, toothed. The colour is rose-red, 

 the inferior half, slightly darker than the upper half, and darker and lighter transparent stripes 

 of the same colour run longitudinally over the surface. Radii very narrow, reddish, with the 

 upper margins very oblique, while the alae are broader and of a lighter colour. 



Size of the specimen: greatest diameter of the basis 17 mm., greatest height of the 

 rostrum 14 mm. 



II. Stat. 258. December 12/16, 1899. Tual-anchorage, Kei-islands. Depth 22 m. Bottom: Litho- 



thamnium, sand and coral. 



Xumerous specimens of different size and shape. The larger, are nearly cylindrical spe- 

 cimens with a cylindrical cup-formed basis, the shell growing wider towards the orifice. The colour 



5 1 



