ACTINOGONIDIATE ECHINODERMS. 229 



XVI. Genus Ophiomastix. 



28. Ophiomastix annulosa. 



Ophiomastix annulosa, M. Tr. Syst. Ast. (1842), p. 107. 

 Minikoi only, common in the boulder zone. 



29. Ophiomastix venosa. 



Ophiomastix venosa, Peters, Arch. f. Naturg. 1852, p. 83. 



Common in the Maldives, at Hulule a regular form in and under coral masses on the 

 sand-flat. 



XVII. Genus Ophionereis. 



An immature specimen from Kolumadulu, 22 f., sand and rubble. 



30. Ophionereis porrecta. 



Ophionereis porrecta, Lyman, Proc. Boston Soc. iV. H. VII. (1860), p. 260. 

 Dredged three times in different atolls, 24 — 35/., coral, rubble or hard bottom. 



XVIII. Genus Ophiothrix. 



Immature forms — often very numerous — in 11 dredgings, 22 — 46 f., usually sand with 

 some rubble, but in the deepest fine, hard mud. 



31. Ophiothrix aspidota. 



Ophiothrix aspidota, M. Tr. Syst. Ast. (1842), p. 115. 

 Suvadiva, 20/., across the inner end of a passage, hard bottom. 



32. Ophiothrix nereidina. 



Ophiura nereidina, Lamk. Anim. S. Vert. ii. (1816), p. 544. 

 Ophiothrix nereidina, M. Tr. Syst. Ast. (1842), p. 115. 

 Minikoi and Maldives, under corals of reef-flat. 



XIX. Genus Ophiopteron. 



33. Ophiopteron elegans. 



Ophiopteron elegans, Ludwig, Zeitschr. f. wiss. Zool. XLVII. (1888), p. 459. 



Dredged five times in 3 atolls, 22 — 35 f, in every case near passages, hard bottom, 

 perhaps rubble and weed. 



XX. Genus Ophioaethiops. 



34. Ophioaethiops unicolor. 



Ophioaethiops, Brock, Zeitschr. f. wiss. Zool. xlvii. (1888), p. 524. 



This is the most interesting of Mr Gardiner's finds, as, with the exception of the three 

 specimens found at Amboina by Brock, the species is unknown. I had little doubt as to 

 the identity of the creature, but to make sure I submitted it to Prof. Ehlers of Gottingen, 



