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In the Gulf of Siam this characteristic species often occurs in short 

 chains (4 specimens together). 



1 (it) - 2 (+) - 3 (+) - 4 (+) - 5 (r) - 7 (+). 



and var. reflexa 4 (rr). 

 Area: Red Sea, Indian Ocean. 



6. C. curvicome (Daday) Cleve, Notes on some Atlantic Plankton- 

 Organisms, Kg]. Sv. Vet.-Ak. Handl., Bd. 34, No. 1, p. 14; C. tripos var. 

 curvicome Daday, Termezetrajzi fiizetek, 1887—88, Pl. Ill, figg. 4, 8, 12, 14; 

 figurae nostrae 3 et 4. 



This species seems to be abundant in the Gulf of Siam. The spe- 

 cimens observed agree well with Daday s figures; but sometimes the 

 curvature of the right posterior horns is less pronounced. As shown in 

 fig. 4 the ventral face of the body is concave and the basilar parts of the 

 posterior horns proceed in a nearly right angle to the transversal axis. 



S(r) - 3(+) - 4(+) - 5(rr) - 6 (+) - 7 (+) - 8 (rr) - 10 (rr). 

 Area: Warmer Atlantic, Mediterranean, Red Sea, Indian Ocean. 



