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PACIFIC SCIENCE, Vol. XVIII, July 1964 
part of these waters and in the Sunda Sea. I 
suspect that it will also extend along the Indian 
Central waters, but lack of sampling in the East- 
Central Indian Ocean does not permit a complete 
picture of the distribution of this species (Fig. 
4). Other records in the Indian Ocean: Baldas- 
seroni (1915), Beraneck (1895), Burfield and 
Harvey (1926), Chacko (1950), Cleve (1901), 
Doncaster (1903), Fowler (1906), George 
(1952), John (1933, 1937), Lele and Gae 
(1936) as S. gardin&ri, Menon (1945), Oye 
( 1918), Pillai (1944), Rao (1958^, b) , Rao 
and Ganapati (1958), Ritter-Zahony (1909, 
1910, 1911), Schilp (1941), Tokioka (1940, 
1955, 1956^, b) , and Varadarajan and Chacko 
(1943). 
S. hexaptera was observed at each of the sta- 
tions of the Monsoon Expedition in the Indian 
Ocean and the Indonesian seas, though it was 
less abundant in the southernmost stations. As 
in the Pacific, this species extends into colder 
regions than does S. enflata (Fig. 4), (Alvarino, 
1964^ and other unpublished data; Bieri, 1959) . 
Other records in the Indian Ocean: Baldasseroni 
(1915), Burfield and Harvey (1926), Don- 
caster (1903) as V tricuspidata and S. magna, 
Langerhans, Fowler (1906), Oye (1918), Ritter- 
Zahony (1909, 1910, 1911), Schilp (1941), 
and Tokioka (1940, 1955, 1956*). 
S. robusta was observed in the Indonesian 
seas and at the northeastern stations in the 
Equatorial Indian Ocean. It apparently remains 
( Fig. 5 ) restricted to the Equatorial waters, 
whereas S. ferox (also an Equatorial species) 
spreads further south into the Tropical region. 
A similar pattern was observed in the Pacific 
(Alvarino, 1962b) . It is obvious that the popu- 
lations of both the Pacific and the Indian oceans 
connect along the Indonesian seas. Other records 
in the Indian Ocean: Baldasseroni (1915, S. 
robusta) , Doncaster (1903), and Fowler (1906), 
recorded both species. Burfield and Harvey 
Fig. 4. Distribution of S. enflata and S. hexaptera in the Indian Ocean, including positive records from 
previous expeditions. 
