5. rOlIACKXTKUS. 21 



Pomacentrus violascens, Bleek. Nutuurk. Tydschr. Nedcrl. Ind. vi. 



p. 318 & xii. p. 222. 

 Dascyllus xanthurus, lilvck. Ainbuina, iii. p. 117. 



D.i^. A.^. L.lat.27. 



The height of the body is two-sevenths or one-fourth of the total 

 length ; praeorbital not serrated. The dorsal spines increase in length 

 posteriorly ; the middle rays of the dorsal and anal fins and the lobes 

 of the caudal are more or less produced into filaments. Violet, silvery 

 beneath ; each scale Avith a vertical bhiish streak ; a large blue spot 

 on the shoulder ; the posterior part of the tail with the caudal and 

 the hindmost portion of the dorsal yellow ; anal yellowish. (Cfr. 

 Ghiphidodon hankieri or nemurus, p. 54.) 



Seas of Nias and Sumbawa. 



a. Adult: fine specimen. From Dr. P. v. Blocker's Collection as 



Dasci/Uus xanthnrHS. 



b. Half-grown : not good state. From Dr. P. v. Bleeker's Collection 



as Pomacentrus violascens. 



11. Pomacentrus cyanomus. 



Bleek. Xatuurk. Tydschr. Nederl. Ind. 1856, xi. p. 89. 



D. [^. A. ^. L. lat. 27. L. transv. 3/10. 



The height of the body is contained t\vice or twice and a fifth in 

 the length taken to the end of the dorsal fin, and thrice and two- 

 thirds in the total. Prneorbital not serrated. The posterior and 

 middle dorsal spines are nearly equal in length j the soft dorsal, the 

 anal, and the caudal lobes are produced into long filaments. A large 

 violet spot at the origin of the lateral line, another in the inner part 

 of the axil of the pectoral fin . Dorsal fin violet, with a blue longi- 

 tudinal band, and with a yellowish spot on the base of the posterior 

 rays ; anal violet ; caudal greenish, each lobe with a violet longi- 

 tudinal band on the margin. 



Seas of Java and Nias. 



a. From Dr. P. v. Bleeker's Collection. 



1 2. Pomacentrus polynema. 



Bleek. Sumatra, ii. p. 283. 



D. j|. A. -1. L. lat. 30. 



The height of the body is two-sevenths of tlie total length ; pra;- 

 orbital denticulated. The dorsal spines increase in length poste- 

 riorly ; the dorsal and anal rays and the lobes of the caudal are pi'o- 

 duccd into short filaments. Yellowish- violet, the scalis on the head 

 with a blue spot, those on the body with a blue vertical line ; blue 

 lines from the orbit to the maxillary ; the spinous dorsal superiorly. 

 and the anal between the single rays with blue streaks. {BJ.) 



Sea of Priaman. 



