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Second pair is short and has slightly unequal rami of 6 and 7 segments; the inner 

 surfaces of the different segments are rounded; they cannot be said to be protuberant. 



Third pair has the rami unequal by one segment: 7 to 8, or 8 to 9. The inner margins, 

 near the upper extremity of the segments, show here and there extremely small teeth in 

 some specimens. In other specimens no teeth could be made out. 



Fourth-sixth pairs of nearly the same structure; the greatest number of segments 

 counted was 21 to 22. This number slightly increases from the 4" 1 to the 6 ,h , and seems also 

 to increase with age. The smallest number seen in the 4" 1 cirrus of one of the specimens 

 was 16. The greatest number of pairs of spines on the anterior face of the segments (PI. XVIII, 

 fig. 9) is 4 pairs; the last pair, being that near the inferior extremity of the segments, is always 

 extremely small. 



Penis long, growing very narrow towards the extremity; with numerous curled hairs, 

 especially on distal part. 



This species was dredged at several stations, and seems to be rather common throughout 

 the whole Archipelago. 



Stat. 50. April 16/18, 1899. Bay of Badjo, West coast of Flores. Depth 27 — 36 m. Bottom : 

 mud, sand, and shells, according to locality. Half-a-dozen specimens attached to 

 a leaf (most probably of a tree). Surface of shell more or less distinctly striped 

 longitudinally. 



Stat. 51. April 19, 1899. Southern part of Molo-strait, Madura-bay. Depth from 69 to 91 m. 

 Bottom: fine grey sand, coarse sand with shells and stones. Two specimens 

 attached to a calcareous plate, probably a part of a trim valve of a Mollusc. 

 Specimens beautifully striped longitudinally. 



Stat. 162. August 18, 1899. Between Loslos and Broken-islands, West coast of Salawatti. Depth 

 18 m. Bottom: coarse and fine sand with clay and shells. Several specimens. 

 Some of them attached to the surface of the shell of a Pecten. Round about 

 a sponge (?) adheres also to that surface, the colony of Balamts extending more 

 or less over the surface of the sponge. 



Stat. 164. August 20, 1899. Lat. i°42'.5 S., Long. i30°47'.5 E. Depth 32 m. Bottom: sand, 

 small stones and shells. Numerous specimens attached to stones, shells of 

 Gastropodous molluscs and other objects, calcareous plates, etc. 



Stat. 213. September 26 — October 26, 1899. Saleyer-anchorage and Surroundings. Depth 9 to 

 34 m. Bottom: coral-reefs, mud, and mud with sand. A single specimen attached 

 to a piece of stone. 



General Remarks. This species occurs at different depths, and is found attached 

 to very different objects. It cannot be wondered at that it varies, like other species of the genus 

 Balanus, not inconsiderably in accordance with the different surroundings midst which it lives. 

 The figure 10 of PI. XVIII shows a specimen (from Station 164) with a somewhat elongate 

 and narrow carina, and with the other compartments more or less swollen in their basal parts. 

 Fig. 2 of PI. XVIII shows two specimens (from Station 51) of a more regular conical shape, 

 the compartments of which are beautifully striped longitudinally. Fig. 1 1 represents a specimen 

 which is very characteristic by the breadth and development of the alae. These parts are, 

 moreover, conspicuous in this specimen because they give one the impression oflyingon another 

 plain, the whole surface of the shell being, in consequence, much less flat and regular than is the 



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