304 THE FOSSIL ECHINOIDEA 



indications, from the position of the transverse swtures, that the form has the usual, 

 nearly rectangular, plates of Temnechinus. 



Were the form more depressed than it is and somewhat polygonal in the outline of 

 the ambitus, the considerable resemblance of it to Temnechinus lineatus, Duncan, of 

 the Australian Tertiary deposits would be very striking. But, although clearly distinct 

 specifically, the two forms are closely allied. 



3. Temitechinus stellulatus, Duncan & Bladen. Plate XL VII, Figs. 8 & 9. 



The test is turban-shaped and broader than high, the tumid condition of the 

 ambitus is noticed also higher up, and the shape is not remote from the hemispherical. 

 The actinal surface is rather flat, and there is some concavity at the small circular 

 peristome. The ambulacra are narrow, rather tumid from side to side, and the 

 poriferous zones are very slightly sunken and narrow. There is a vertical row of 

 small primary tubercles on each side of the ambulacrum, close to the poriferous areas, 

 and the tubercles have a small imperforate mamelon, and an expanded, low, but tumid 

 base, the edges of which are either circular or incised here and there. Costa-like 

 narrow and separate processes pass from the edge of the base of the tubercles, princi- 

 pally adorally, to reach the small rounded granules which are on the plate placed 

 adorally to the tubercle-bearing one. Others, which are very short, arise from the 

 inner part of the edge of the base, and pass to the granules close to the inner side of 

 the tubercles ; and sometimes there are two or three processes that have an aboral 

 course to reach the two or three granules placed between the successive tubercles. 

 The tubercles are placed so close to the poriferous zone that there are no intermediate 

 granules, and the poriferous zones seem to be well defined from the interporiferous. 

 Between the rows of the primary tubercles and the granules immediately associated 

 with them is a rather confused ornamentation of small granules, more or less united 

 together by radiating and very thin costa-like processes, giving a stellate appearance. 

 A few large granules are mixed up in this ornamentation and add to the confused 

 appearance. Near the apical end of the ambulacrum there is often a tubercle 

 surrounded by a ring of granules, each of which is connected with it by a radiating 

 process. 



The interradia are slightly sunken along the median line, and the plates are 

 rectangular, and not very high. A row of small primary tubercles, slightly larger than 

 those of the ambulacra, is placed vertically on either side of the median line, and there 

 is a tubercle on the centre of each coronal plate. Each tubercle has a small imperforate 

 mamelon, a broad, flat, and tumid base, and radiating from it numerous processes 

 pass to an encircling series of granules. Usually these short costa-like processes do 

 not pass from the tubercle of one plate to that immediately above or below, but the 

 straight close processes stop at the transverse suture ; nevertheless near the abactinal 

 part of the interradia this junction may exist. There are two or three rows of granules 

 placed between the tubercles and the poriferous zones. Between the rows of tubercles, 

 and especially close to the median line, there is much small granulation, and the 

 irregularly disposed granules are united by short, slender, and straight processes. In 



