ities, 
XI 
capitulum of from 45 to 52 mm. in length and was dredged at depths varying from 204 
to 450 m. 
As contributing to our knowledge of the geographical distribution of the Cirripedia, it 
is certainly a remarkable fact that so many as 75 new species should be collected during the 
cruise of the Siboga. With the addition of these new species and of those which, although 
already known, were not yet observed in that region, the Sixth Province, which I proposed 
for the East Indian Archipelago and eastern coasts of India (Challenger-Report p. 33), has 
become by far the richest in species. In the said report, I gave a list of the species known at 
the time (1883) to occur in that province; here follows a list of the genera now known to be 
represented in that region, showing at the same time how the number of species for each genus 
has increased since the former list was composed. 
List of the genera of Cirripedia, with number of species, hitherto observed in 
the East Indian Archipelago and in the waters of South-Eastern Asia. 
Species to be added to the list, on the authority of: Species 
1883, | . 5 7 ee - = — - < == = pam pee , : 
Horx, |2 | , l's|/Slelsi/e/3]/s/ 8 )3]5 |3| ams [22 
GENERA Challenger] @ Ee % | | a | S | pci ae on ps 2 a * “Siboga” 5 s 
eee le es | Sle |e le | 2 le lee | tee le 35 
Bs 3 g | 3 | 3 | Z | 2 ; 5 | 3 | z g | 5 Z known| new e = 
erin : | 8 o I | Oo | 6 o | z z Oo z species species 
Eepasens |. « « 4 | za Ieee fei | eae = I | 6 
Poecilasma. . 2 —| 4 | 1 |—/|—| — pean ieee (1) | — J—f (2) 3 13 
Dichelaspis. . I SCY 6 Weal ee all GE lp ee (x) 17 
Oxynaspis . . — —|— al == (1) = oe a) CE eet he I 
Conchoderma = | = | (1) | | ee lg |, Fe I 
Megalasma. . I =| I | | Pa pees ae I 4 
Alepas .... — — Ne (ad Peal a eae a | I | | See (yes 5 10 
Microlepas. . = i—| — | | — | — aus I I 
Lbla. 646 0°40 I | | i — | I 2 
Scalpellum. . 15 | I | | I— |2&(3)ls e(x)) — | x | (3) | 32 | 63 
Pollicipes. . . I =| = — || — | — I 
Lithotrya 2 ee ye 0) ee) a I 5 
Verruca... I se | eee te ee 6 1 
Balanus .. . 13 —|— |—| — | (3) 7 r |— |re(1} (1) )-— |= [rey] — 4 38 
AGGSIG <3 3 4 —|— |—| — |(1) fy ae —|};— = | = heQ) — |—| (1) 2 10 
Hexelasma. . — = |= | a | || | —}| — 2 2 
Tetrachita . . 4 = || ==] | =) |b Oy mn) - 6 
Pyrgoma... 4 _- (1) | hekes{ (1) |) ||) ee == 2 ¢ 
; | — — a=: — a 
Pyrgopsis .. — == ee te ae ag a Peer ie are Geos Mes 
Cyeusian > ~~ I ee | i i ie ee | : 
Chelonobia . . — — | (2) | tee eee oe oe : 
Stephanolepas — ie) — (—| | cer mas Mages - - — — ; 
Chthamalus . 2 ee | Or) at ee ee ie a Ney ia ; 
Octomeris . . I St pe el es Swe =i — 
Total number of species oe) Pe 2 
but new to the fauna of the province. 
Note. The numbers in brackets refer to species already known, dae 
i te ing » © se » 12 
# One of these species is described in the present report, although it was not collected during the cruise of the oiboga 
