"I 



i triangular, the umbo pointing outwards; laterall) it slightly overlaps the 



Rostrum strong and rather large, having the shape of a pyramidal wedge, with the 

 t( |. prominent beyond the occludent margin of the scutum. Lateral margin nearly straight. 



1 the lower whorl two pairs, small, corresponding probably with the rostral 



and carinal latera t >t" other ^]»< ■ \. xlpellum. lh<- inferior angle of the pentagonal upper 



1 .1 1 u s also meets where they nearly touch one another. 



Peduncle wide at the summit, conical, short. Surface with very numerous narrow, 

 chitinous scales, placed rather far from each other, arranged in regular rows. 



I ength "i the capitulum 8 mm., of th<- peduncle ui >< >m 2 mm. 



The "Sib illected this interesting form at: 



Stat. aepterabei 20, [899. Lat. 4 20' S., Long. I22°58'E. Depth 75 94 tn. Bottom: 



sand with dead shells. 1 specimen. (A few specimens of Sc. rostratum Darwin 

 were found at the same Station.) 



General Remark. This curious form belongs to the same group of species as Seal- 



. llosum Leach, Sc. trispinosum mihi, Sic. sexcornutum Pilsbry and some of the species 



provisionally described l>y Aurivillius and which are all characterised by straight or nearly 



straight carinae. In Sc. artes the carina may really be said to be straight; it can be distinguished 



:ly from the other species by the number 13) of its valves and by the very characteristic 



shape of its rostrum. 



3. Scalpellum acutum Hoek. PI. VII, fig. 1. 



Hoi k. Cirripedia collected by ll.M.S. "Challenger". 1883, p. 80, pi. III, fig. 19, pi. VIII, fig. 1 _\ 



This interesting deep-sea species was collected by H. M. S. "Siboga" at three different 

 5l Lti 'iis. They are very small animals: I measured two, in one the total len<:th was 7,6 mm., 

 the length of the capitulum 5,6 mm., in the other respectively 6,5 and 4,7 mm. 



I think there can be no doubt, that the specimens are identical with those collected by 



the "Challenger". Grüvel 1 has described as a new species (Sc. longirostrum) a form of Scal- 



pellutn much resembling my Sc. acutum, the main difference being that the carina of the new 



species is somewhat broader. My figure ("Challenger" Cirripedia PI. III, fig. 19) represents the 



little anima! with the rostral side slightly turned up, so that the carina in the figure looks 



narrower than it really is. And my description: "Carina short, simply bowed; sides almost 



wantin--, only slightly developed in the superior part" has heen misleading in so far that 1 



should have added: a little more so towards the inferior extremity. Of the other differences 



points out, the height of the sub-carina, which he says nearly equals that ot" the rostrum 



"presque ausM élevée que Ie rostre") and which is much smaller in the "Challenger" specimens 



■ in those collected by the "Siboga", is by far the most important. Hut altogether these 



diffi only slight: in comparing the specimens with one another they may perhaps 



pp r all to be identical. 



. du "Travailleur" et du "Talisman". 1902. p. 70. 



64 



