§5 



end of most segments are planted a few delicate hairs, one of those found at the tip of the 

 last segment being much stouter and more than twice as long as the last segment. This hair 

 is very distinctly barbed or feathered. 



No penis. 



Dwarf mal es. I found three on the left and two on the right side of one of the 

 specimens. They are lodged in a pouch formed by the mantle along the inner side of the scutum, 

 near the occludent margin, slightly in front of the adductor scutorum muscle. They have the 

 ordinary shape and structure; their size is 0,8 X 0,5 mm. The antennae are situated at about 

 ] / 3 rd the length of the animal from the posterior extremity, the anterior extremity or pole being 

 considered to be where the large opening which gives entrance to the sac is found. No tracé 

 of calcareous plates or rudimentary valves. Surface covered with very small hairs or spines, 

 arranged on transverse rows all over the surface. The transverse rows are very close to one 

 another and numerous. A few slightly longer hairs are planted on both sides of the longer axis 

 of the oval opening of the sac. Of the interior structure are seen the rather large testicula, 

 the pointed extremities of which are directed towards the posterior pole of the body; then the 

 receptaculum seminis densely filled with threadlike spermatozoids; cement-glands at the base of 

 the antennae; a rudimentary thorax and abdomen bearing long spinedike hairs at the extremity. 

 The latter represent the cirri and are directed towards the opening of the sac. 



The "Challenger" took a specimen of this species in the neighbourhood of the New 

 Britannia Archipelago, east of New Guinea ; H. M. S. "Siboga" collected specimens at the 

 following places : 



Stat. 88. June 20, 1899. Lat. o° 34.6 N., Long. U9°8'.5E. Depth 1301 m. Bottom: fine, 



grey mud. One specimen. 

 Stat. 175. Aug. 30, 1899. Lat. 2°^y'.'/S., Long. I30°33'.4E. Depth 1914 m. Bottom: fine, 



grey and green mud. One specimen, attached to the shell of a Gastropod. 

 Stat. 208. Sept. 22, 1S99. Lat. 5°39'S., Long. I2i°23'.5 E. Depth 2218 m. Bottom: grey mud. 



One specimen, a small one, attached to a chitinous tube, the skin of the siphon 



of a Lamellibranchiate Mollusc most probably. 



Observa t i o n s. This species is nearly related to the foregoing : Sc. polymorphum. 

 The form of the scutum and of several other valves, however, show its clistinctness. 



D. Sectio: Arco-Scalpellum 



14. Scalpclluni moluccanum Hoek. PI. VII, fig. 13. 



Hoek, Cirripedia collected by H. M.S. "Challenger". 1883, p. 104; pi. V, figs. 3, 4. 



H. M. S. "Siboga" collected one specimen of a Scalpellum species which I think must 

 be referred to this species. To the left side of this specimen two rather large specimens of the 

 species which I have proposed to call Sc. inflatum (p. 76) were found attached and in consequence 

 of this the specimen is slightly abnormal in shape. The carina especially has grown quite 

 asymmetrical making it difficult to judge its original shape. 



The specimen belongs certainly to the group of species : Sc. regm/u, Sc. Darwini and 

 Sc. moluccanum which are nearly related to one another. It comes nearest to Sc. moluccanum 

 and as it was taken at about the same locality (see below), I may be entitled to consider it 



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