Red sea and Indian ocean copepoda 407 



Length of female, 1*15 mm. Length of male, 1*16 mm. 

 This species resembles C. elliptica, bnt can be easily 

 identified by its smaller size and more slender abdomen. 

 The side view of the female abdomen shows it to be very 

 little wider than the caudal furca. The species is mainly 

 distinguished from C. elliptica, however, by the structure 

 of the fifth pair of feet. The fifth pair in the female is 

 one-branched, and each foot is composed of three joints of 

 nearly equal length. The right and left feet are quite 

 symmetrical. The second joint has one short seta on the 

 middle of the outer margin. The third, or terminal joint, 

 has one seta on the outer margin about two-thirds from 

 the base and two on the apex, the inner one being rather 

 longer than the joint. The inner seta on the right foot is 

 rather longer than the same seta on the left foot. The 

 fifth pair in the male is also one-branched, and each foot 

 is composed of four joints. The basal joint of the left 

 foot is very small, and only about two-fifths the length of 

 the second joint. Second and third joints of nearly equal 

 length. The second joint has a projection on the inner 

 margin near the base. Fourth joint small and only about 

 half the length of the third joint. The right foot is 

 modified for grasping. See fig, 5. 



Calanopia americana, Dahl, (Ber. Gres. Freiburg X.S., 

 Vol. 8, p. 21, t. 1, figs. 23-2fj), and Calanopia aurivillii, 

 Cleve, (Kongl. Vet. Akad. Handl. Bd. 3d, No. 5, p. 32, 

 pis. 2 and 3), are very like Calanopia minor in general 

 appearance, but the structure of the fifth pair of feet, both 

 in the male and female, are different. 



Labidocera acuta (Dana). 

 Occurrence, jS"o. 8. A night gathering, 40' west of Aden. 



Labidocera minuta, Giesbrecht. 

 Occurrence, jS"os. 7, 10, 16. 



