TEMNOPLEURUS REYNAUDI. 461 



dian interambulacral line, with a similar vertical line of disconnected pits 

 adjoining the poriferous zone. Below the ambitus in both areas the bare sut- 

 ures and pits disappear completely ; the tubercles of both areas are of uniform 

 size, decreasing but slightly in size towards the actinostome, which is sunken 

 and scarcely indented ; actinal membrane extremely thin, completely bare, 

 with large buccal plates. On the actinal side the interambulacral tubercles 

 form six principal vertical rows ; interstices closely filled by secondaries. In 

 the ambulacral space there are but two principal rows, with median space 

 filled by ten irregular rows of secondaries. In the interambulacral space at 

 the ambitus there are two principal vertical rows of primary tubercles, nearly 

 as large as the interambulacral primaries, decreasing very gradually towards 

 the abactinal pole. The median space is bare ; edges of plates bevelled ; 

 bare space connected from abactinal pole to ambitus ; rest of plate as 

 in the interambulacral space, closely crowded by small secondaries and mil- 

 iaries irregularly arranged. The color of test is yellowish ; spines are 

 comparatively short and stout, pointed, dark violet at base and tipped 

 with yellow at the point, On the actinal side the spines flattened, and 

 banded with darker tints ; connecting ridge of auricles very low. 



Japan. 



Temnopleurus Reynaudi 



! Temnopleurus Reynaudi Agass., 184G, C. R. Ann. Sc. Nat. VI. 



PL VIII. f. 22 -24; PI VHP.f. 6-7. 



This species does not reach the size of Temnopleurus toreumaticus. It is 

 readily distinguished by its thin test, its comparatively larger actinostome, 

 its immense anal system, and narrow genital ring ; the facies of this species 

 being more like Salmacis than like Temnopleurus. The furrows along the 

 sutures of the interambulacral spaces are shorter, extending but little way 

 from the median line, and the furrows adjoining the poriferous zone are 

 quite small ; these furrows are more or less comma-shaped, and become 

 shallow towards the principal vertical row of tubercles. The contrast be- 

 tween the two primary vertical rows of tubercles and the secondaries is quite 

 marked. At the ambitus there are three vertical rows for each plate, but the 



