394 Annals of the South African Museum.. 



and not much sunken; the periproct is not more than one-third as 

 large as the mouth, is longer than wide, and lies half way between 

 the posterior margin of mouth and the end of the test. 



The other specimen is 9'5 mm. long, 7 mm. wide and about 

 3'5 mm. high. The crowded, very pale brown spinelets conceal the 

 petals entirely but when they are rubbed off, it is possible to count 

 8 pore-pairs on one side of one of the paired petals, but they are 

 so small and deeply sunken, it is hard to see them; the mouth is 

 large, nearly circular, apparently about three times as large as the 

 periproct; the latter is longer than wide. 



In general these specimens answer well to Mazzetti's description, 

 but in one or t\vo particulars they differ; in his type, which was 

 smaller than either of these, he counted nine pore-pairs, while eight 

 is the maximum number for these larger specimens; again in these 

 specimens the lower surface of the test is scarcely concave below 

 while according to Mazzetti his specimen was markedly so. In 

 spite of these differences however I think it better to refer the 

 South African specimens to the Red Sea species elcgans, than to 

 establish a new species in a genus already overburdened with insuffi- 

 ciently known forms. 



P.F. 10722. Cape Natal, W. by N., 6^2 miles, 54 fms. Fne. s. 

 1 specimen; adult; bare. 



P.F. 13228. Cove Rock, N.W. 3 / 4 N., 13 miles, 80-130 fms. Crl. 

 and r. 1 specimen; adult. 



SCUTELLIDAE. 



This family is represented in South Africa by only the following- 

 species, both of which are well-known Indian Ocean forms. 



Key to tlie So/tfh African Species of Scutellidae. 



Each posterior ambulacrum with a long, narrow lunule distal to petal 



Echinodiscus bisperforatus. 



Each posterior ambulacrum with a deep, narrow slit, extending in from margin 



Echinodiscus auritus. 



ECHINODISCUS BISPERFORATUS. 



Leske, 1778. Add. ad Klein, p. 132. Agassiz, 1841. Mon. Scut., 

 pi. XII (as Lobopliora bifora). 



There are specimens of this fine scuttellid in the M. C. Z. collec- 

 tion from Mozambique, Durban and Mossel Bay. It is well-known 



