The Ecliinoderm Fauna of South Africa. 397 



more capitate in Tropholampas than in Neolampas, it is interesting 

 to lind that the primary spines are much more acuminate, and arc 

 quite sharp. 



The pedicellariae of Tropholampas are of only one kind so far as 

 I can find, and they occur only about the abactinal system. They 

 are large tridentate, with valves about -20 nun. long; the basal part 

 is about -15 mm. wide and -10 high: the blade is only about -01 mm. 

 wide at base but is twice that near tip; the valves are rather strong! v 

 curved near tip, where they meet only by their terminal edges. 



The colour of these specimens in alcohol is pale grayish, with a 

 slight yellowish tinge, but they are nearly white when (fry. The 

 largest is a male, measuring 8 mm. long, by 6 mm. wide and 5 

 mm. high. The largest female is about 7 mm. long but is nearly 

 as wide and as high as the male. 



There can be little doubt that this interesting little nucleolitid is 

 nearly related to Neolampas rostellata of the Caribbean Sea. In 

 this Neolampas there is a well-marked sexual dimorphism, as the 

 genital pores of the female are very large so that a considerable 

 part of the abactinal system is membranous. It is not hard to see 

 how such a condition might lead to invagination of the area affected 

 and thus a brood pouch would easily be formed. In Neolampas 

 rostellata there are however only three genital pores, the left ante- 

 rior (i. e. the one in genital 3) being wanting. In other particulars, 

 the whole abactinal region of rostellata is less specialized than in 

 the African species, for there are five distinct ocular pores and the 

 ocular plates are in contact with the fused genitals. 



The specimens of Tropholampas were taken at the following places. 



P.F. 14252. Cape St. Francis, N. E. 29 miles, 75 fms. S., sh., r. 

 1 specimen ; adult. 



P.F. 15129. Table Mountain, E. by S. / 2 S., 25 miles, 190 fms. 

 Gn. s., bl. spks. 12 specimens; adult. 



ECHINOLAMPAS CRASSA. 



Palaeolampas crassa Bell, 1880. Proc. Zool. Soc. London, p. 43; pi. IV. 

 Echinolampas crassa H. L. Clark, 1917. Mem. M. C. Z., vol. 46, p. 113. 



It is a little strange that the PIETER FAURE has not met with 

 this species. It is apparently very local, for the only known station 

 for living specimens is two miles north-northeast of Kromhont in 

 14 fms. of water. The VALDIVIA met with a fragment of a dead 

 test off the Cape Colony coast in 276 fms. but this had no doubt 

 been washed out from much shallower water. 



26 



