4G2 TEMNOPLEURTJS REYNAUDI. 



two vertical rows flanking the principal row are made up of small seconda- 

 ries extending higher up on the test than is the ease in T. toreuniaticus. 

 Above the ambitus there are other secondaries arranged in arcs round the 

 primaries on the upper part of the coronal plates. The principal row retains 

 its prominence on the actinal surface, the secondary rows of tubercles not 

 increasing in size. The pits are deeper and better defined on the actinal 

 siu face than above the ambitus. The abactinal system is large ; genital plates 

 heptagonal, pointed, with a sharp rectangular furrow across the base of the 

 ocular plates, which are pentagonal, with the outer side forked; genital 

 openings large. One ocular plate only reaches the large anal system, all 

 others excluded. In the largest specimens sometimes three ocular plates 

 reach the anal system. Madreporic genital much larger than the others. 

 Anal system covered by one large plate with a number of other smaller 

 plates decreasing towards the anus, the large anal plate more or less promi- 

 nent according to size of specimen. The comma-shaped pits of the interambu- 

 lacral space frequently form depressed Lozenges by the junction of the fur- 

 rows of the two ends of a plate, at the apex of which is placed the primary 

 tubercle; at other times the depression is limited to a mere narrow furrow 

 connecting the two pits, or the pits remain distinct. In the ambulacra! space 

 there are two principal vertical rows adjoining the broad poriferous zone, 

 with two inner irregular vertical rows of secondaries. The structure of the 

 pits is similar to that of the furrows of the median interambulacral space. 

 The tubercles of the ambulacra are as large as those of the interambulacra. 

 The poriferous zone is broad, though tin' pores are arranged nearly ver- 

 tically, leaving a bare space between it and the adjacent interambulacral 

 plates; and at the junction of the ambulacral plates and interambulacral 

 plates there is a vertical row of small pits. The color of the test is yellow- 

 ish, with light violet stripes along the median interambulacral and ambula- 

 cral zones; straw-colored below. The spines are comparatively more pointed 

 than in T. torenmaticus, and of a dark violet at base and lighter colored at 

 tip. The largest specimen I have seen of this species measured 40 mm in 

 diameter, with spines 14 mm - long. 



Ceylon ; China Seas. 



