The Echinoderm Fauna of South Africa. .'341 



OPHIOTHRIX POECILODISCA. 

 II. L. Clark, 1915. Mem. M. C. Z., vol. 25, p. 276; pi. 13, fig. 5. 



This well-marked species, known hitherto only from Zanzibar, 

 is represented in the present collection by a small and badly damaged 

 specimen from Delagoa Bay. It is about 5 mm. across the disk and 

 was collected by K. H. Barnard in October, 1912. The transverse, deep 

 red lines across the arms are very distinctive. The lower arm plates 

 however lack the red markings altogether. The disk carries only 

 7 or 8 spines. 



* OPHIOTHRIX TRILINEATA. 

 Liitken, 18(39. Add. ad Hist. Oph., pt. 3, pp. 58 and 100. 



This wide-spread and handsome Indo-Pacific species has long 

 been known from Mozambique, whence specimens came to the M. 

 C. Z. many years ago, but it has not yet been found south of that 

 point, and it is not represented in the collections of the South 

 African Museum. 



* OPHIOCNEMIS MARMORATA. 



Oph turn ntarniorata Lamarck, 1816. Anim. s. Vert., vol. 2, p. 543. 



Opiocnemis marmorata Miiller and Troschel, 1842. Sys. Ast., p. 87. 



Doderlein, 1888. Zool. Jahrb., vol. 3, pi. XXXII, figs. Qa-c. 



The inclusion of this species in the South African fauna seems to 

 rest wholly on a specimen in the M. C. Z. collection, collected by 

 Wahlberg and said to have come from the Cape of Good Hope. It 

 occurs commonly at Zanzibar but has not been recorded from Mo- 

 zambique and its occurrence on the coasts of Natal and Cape Colony 

 seems to me very unlikely. 



OPHIOPSAMMIUM NUDUM *, sp. nov. 



Disk 6 mm. in diameter ; arms five, 25-30 mm. long. Disk covered 

 by a thin naked skin, through which the five pairs of large radial shields 

 are plainly visible ; scattered sparsely over this skin are plates and 

 granules; at the center of the disk are about a dozen, flat, nearly 

 circular plates irregularly scattered, and others form a single dis- 

 continuous series in each of the narrow interradial areas; these plates 

 are from "10 to '25 mm. across and some of them bear spherical or 



* nudum = naked, in reference to the absence of plates at center of disk and 

 on interbrachial areas below. 



