340 NEOLAMPAS 110STELLATA. 



NEOLAMPAS. 



Neolampas A. Agass. 1869. Bull. M. C. Z., I., No. 9, p. 271. 



Test thin ; outline pyriform from above, profile regularly arched, posterior 

 extremity truncated, anal opening projecting as a tube ; tubercles of uniform 

 size over the whole test, raised above the surface of the test; no ambulacral 

 petals; ambulacra! system simple, reduced to single pores between the am- 

 bulacral plates, extending from the apex to the actinostome. Floscelle and 

 bourrclets well developed. 



Neolampas rostellata 



! Neolampas rostellatus A. AGASS. 18G9. Bull. M. C. Z\, I., No. 9, p. 271. 



Pl.XVII.f.i-i:. 



Outline from above resembling Echinolampas ( PI. X J 7/ /'. /). more elon- 

 gated, three large genital openings, placed closely together, the light or left 

 anterior one atrophied, madreporic body restricted to a narrow ridge sepa- 

 rating them. Seen in profile ( /'/. XVII. f. .;), the test rises gradually from 

 the anterior extremity towards the apical system, attaining its greatest 

 height between it and the posterior extremity; this is sharply truncated 

 anteriorly, as in some species of CatopygUS. The lower surface ( I'/. AT//. 

 /'. .') is concave, undulating; the anal system (PI. AT//./. j„ :,\ is large, 

 elliptical, occupying the whole of the posterior truncated end, somewhat as 

 in Hotriopygus, the test being turned in like the linger of a glove, while the 

 anus opens at the end of a long slender tube, projecting well beyond the out- 

 line of the test [PL XVII. f. a), the anal tube starts from the upper part of the 

 anal membrane, this is covered by small plates (PI. XVII. f. 5), gradually 

 diminishing in size, and eventually firmly soldered together to form the base of 

 the anal tube. Test thin, mouth placed near the anterior extremity, having a 

 well-developed floscelle and prominent bourrelets (PI. XVII. f. 9). The test 

 is covered by minute tubercles of different sizes (PI. XVII. f. s), not separated 

 into primaries and miliaries, as in Echinolampas. The tubercles are riot 

 sunk, but stand out prominently from the test, having a smooth maniinillary 

 boss and a rough scrobicular area. The spines are straight. very line, slightly 

 club-shaped, resembling those of the Scutellidae (PI. XVII. f. 10). There 

 is no ambulacral rosette, so prominent in all the Echinolampadae. From an 



