242 HAWAIIAN AND OTHER PACIFIC ECHINI. 



Ill is a cluster of 10-15 large secondary or small primary tubercles, but these 

 are not conspicuous. They are visible in fig. 2 of the Challenger Report. 



The periproct is slightly sunken, especially its lower portion. The posterior 

 end of the test is vertical or slightly oblique outwardly in its upper half, but 

 the lower half is markedly oblique towards the mouth. The upper margin of 

 the periproct and the upper margin of the end of the test coincide, but the 

 lower margin of the periproct is nearly or quite a millimeter below the sides of 

 the test-end. The subanal plastron is rounded-triangular rather convex, and 

 includes on each side four ambulacral plates, with three large tube-feet. The 

 point where the subanal fasciole crosses the end of the sternum is very conspicu- 

 ous, the subanal plastron, ambulacra I and V and the sternum all sloping to it. 

 This is well shown in fig. 4 of the Challenger Report. The sternum is fairly 

 well developed, about 11 mm. long and 5 mm. wide at posterior end; except the 

 extreme anterior end it is well covered by primary tubercles. The labrum is 

 about 4 mm. long and, at the middle about 1.70 mm. wide; it is markedly T- 

 shaped. All the features of the oral surface of the test are fairly well shown in 

 fig. 3 of the Challenger Report, but it should be stated that the posterior end 

 of the labrum does not reach back to the end of the second ambulacral plate 

 on each side. The color of these specimens is hard to name. Mr. Agassiz 

 calls it "dark pinkish buff." After their long sojourn in alcohol, they are very 

 light brown, but still with a decidedly pinkish cast. The primary spines are 

 white or nearly so. 



The covering of miliary and secondary spines is fairly uniform, but they are 

 longer at the apical system and at the posterior end of the test than elsewhere. 

 The abactinal primary spines are all broken, but those of the oral surface arc 

 5 or 6 mm. long; those along the sides of the sternum are longest and are 

 markedly curved. Pedicellariae are abundant orally and at the posterior end 

 of the test. The most striking are those occurring on the bare ventral ambulacra, 

 and which I call globiferous. (Similar pedicellariae in Pseudomaretia and 

 Lovenia are considered a form of tridentate by Doderlein and Koehler. Doder- 

 lein at first called them "globiferous" but later, on finding another sort of 

 globiferous in Lovenia subcarmata, called them "bandformige" tridentate. It 

 seems desirable to call them globiferous because of the conspicuous glandular 

 tissue which surrounds the tips of the valves). These pedicellariae have stalks 

 about half a millimeter long, the lower part of which is Blender but the distal 

 half is conspicuously swollen; a constriction around the swelling makes it } 

 ble to distinguish between a coarser, lower swelling and a finer, more compact 



