404 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Centropages orsinii, Giesbrecht. 

 Occurrence, Nos. 4, 5, 8, 9, 11, 12. 



This species has only been recorded from the Red Sea, 

 and the present collection extends its distribution into the 

 Gulf of Aden. 



Centropages calaninus (Dana). 

 Occurrence, Nos. 1, 2, 3. 



This species resembles C. violaceus in appearance, but 

 the male is easily recognised by its fifth pair of feet. It 

 has only previously been recorded from the Pacific Ocean. 



Gentropages elongatus, Giesbrecht. Plate I., figs. 13 

 and 14. 



Occurrence, Nos. 4, 5, 12, 14, 18, 19. 



This Centropages also resembles C. violaceus in 

 appearance, but the fifth pair of feet in the male are quite 

 distinct from C. violaceus or C. orsinii. Dr. Giesbrecht 

 found this species in plankton collected by the aid of the 

 ship's pump by Dr. A. Kramer, when passing through the 

 Red Sea at the end of July, 1895. The gatherings in which 

 C. elongatus were found by Giesbrecht were taken between 

 15° N. and 27° N. well inside the Red Sea. The Robinson 

 collection extends the distribution into the Indian Ocean 

 to near Colombo. The figures show a dorsal view of the 

 male, which measured 2*2 mm., and the male fifth feet. 



Pseudodiaptonuis serricaudatus (T. Scott). Plate I., fig. 6. 

 Occurrence, Nos. 8, 9. Both night gatherings, near Aden. 

 This species was first discovered by Mr. T. Scott in a 

 collection of Copepoda, &c, from the Gulf of Guinea, 

 West Coast of Africa. It has since been recorded from 

 India. 



Temora stylifera (Dana). 

 Occurrence, Nos. 6, 7, 8, 9, 10, 12, 13, 14, 16, 18, 19. 



