Verrill, JVbtes on Hadiata. 591 



of the fascicle also varies, especially on the left side; in five (but not 

 the same five that agree in the posterior region) it has but one angle, 

 near the antero-lateral grooves, where it rises highest ; in three it has 

 two angles, rising highest at the posterior one, and nearly straight 

 between ; in two others, which also have two angles, the transverse 

 part is double. On the other side the fasciole varies in the same way, 

 but not in the same specimens, for some have two angles, both on the 

 right and left ; others two only on one side ; others one on both sides. 

 The anal fasciole is also variable; usually the subanal branch is want- 

 ing or indistinct, though indicated by a band of smaller tubercles, but 

 in one specimen it is well marked and the subanal disk is clearly and 

 pei'fectly circumscribed. In this the subanal disk is very broad, bilo- 

 bed, narrowest in the middle, scarcely heart-shaped, the anterior bor- 

 der being nearly transverse, and the posterior border nearly p:irallel 

 with the anal region and about "15 of an inch fi'om it. In others the 

 posterior border is more curved. One specimen has but three ovarial 

 openings, the rest four. The proportionate length of the ambulacral 

 grooves varies considerably, both in difterent s]>ecimens and on oppo- 

 site sides of the same individual, sometimes those on the right being 

 longest, sometimes those on the left, and not uncommonly a longer 

 anterior one is offset by a shorter posterior one on the same side. 



My specimens differ widely from Gray's figure, the position of the 

 anal area, especially, is quite different, it being in the figure at a con- 

 siderable distance from the posterior end, and thei'efore more ventral 

 and nearer the subanal fasciole. The peripetalous fasciole is also very 

 different from that of any of my specimens. 



Mr. A. Agassiz, who has recently examined Gray's type in the Brit- 

 ish Museum, is fully satisfied that it is identical with JT. nigra, as he 

 had previously supposed. 



The locality given by Gray (Australia) is, therefore, doubtless erro- 

 neous. 



Metalia nobilis Veniii. (p. 3i9). 



Plagionotus nohilis A. Agassiz, Bulletin Miis. Coni)i. ZooL, i, p. 302, 1870. 



Mr. Agassiz, after an examination of the original specimen, referred 

 this species to Plagionotus. In this opinion I cannot concur, unless 

 Metalia and Plagionotus are to be united, which at present does not 

 seem to be justifiable, although the two groups are evidently closely 

 allied. 



Metalia nohilis ajjpears to be much more closely allied to 3f. ster- 

 nalis, and especially to M. Garretii, than to the two typical species 



