i 6 



With regard to the structure of the cirri the main difference between Darwin's 



ription and what I have found is, that I tliink the unequality "f the rami :ilm< >^t unimportant, 



and further, that the segments of the rami of th( rri are distinctly protuberant. 



er the <irri are short, the segments of the rami being bul 1 ï 1 1 1 * - longer than broad and 



j numerous; the last pair has rami of i ; and i i segments in one of the specimens I 



ited rhese segments have the ordinar) 3 or 4 pairs of spines on the anterior face, 



l>ut as the segments are rather short these pairs stand close together and form groups of spines, 



a "brush" as Darwin s.i\->. with the more or less numerous lateral marginal spines. The dorsal 



sidi ment bears the ordinary dorsal tuft near th( mity PI. X. fig. ; 



The caudal appendages .in- short, less than half the length of the lower segment 

 of the ped ' the sixth cirrus; they are slightlj swollen about the middle, the rounded 



mity being distinctly narrower. rhe distal third part is thickl) clothed with delicate bri 

 ling i>ut in all directions. 



During tin- cruise <>f the "Siboga" this species was collected at: 



About St.it. 51: in Streel Molo. Depth 54 — 90 m. 1 small specimen. 



Stat. 79. June u. 1899. Lat. _• 43 S.. Long. 11 7° 44 I ■ Depth |i 54 m. Bottom: fine 



sand [Borneo Bank]. Attached i<< the spines of a Cidaris bispinosa Lam. 8 specimens, 



most "f them small. three larger. The greatest diameter of the largest is about 7 mm. 

 Stat. "il'. June 12, [899. Lat. 2 ;S.;S.. Long. 117 46 I I' pth 54 m. Bottom: line coral 



sand [Borneo Bank: 5 miles N.N. E. from Station 79]. 4 specimens, greatest diameter 



of largest 7 mm. 

 . June [3, [899. l.at. 2 25 S.. Long. i 1 7 T 4 3 11. Depth 40 — 50 m. Bottom: line coral- 



sand. 4 specimens, largest not quite 5 mm. 



General Remark. This species, which was known to Darwin from specimens from 



inea only, may now be considered to occur at different places in the Malay Archipelago. 



It lives attached to the spines of Echinus, Cidaris and perhaps other forms of Echinidae and 



seem 1 down to depths of over 50 m. According to W'1.1 ixer ' the Berlin .Museum possesses 



specimens of this species collected in the Red Sea l>v I.ii-hs'-j. 



Genus Dichelaspis Darwin 



Darwin (185 1) instituted the genus Dichelaspis tor those Lepadidae which have 5 valves. 

 generall_\ appearing like 7 from each scutum being divided into two distinct segments united 

 at the rostral angle; he distinguished live species of the genus. When my report on the 

 "Challenger" Cirripedia was publishe ■ ; the number of known species had increased to 



nine. Since that time the number has increased considerably ; Weltner, publishing a list in 

 • the then known sprei.--, of Cirripedia, was able to count 18 species, or even io. as 

 . slight omission one of the 8 new introduced into science li\- Aürivillius was left 



out iMk. Weltner also mentioned two new species which Stebbing ' described in 1 



1 W W.. '. ' v f. Naturg. i s., ,-. |„! |. n. -. p, ...j ;. 



'■'■ . Ibidi m, i'. 241. 



■ . W.. Studiën etc. r -28. 



■■. \ 1 • a iS— 19. 



t6 



