Verrill, Notes on Radiata. 591 



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

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

 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. 

 Tlie 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 

 perfectly circumscribed. In this the subanal disk is very broad, bilo- 

 bcd, narrowest in the middle, scarcely heait-shaped, the anterior bor- 

 der being nearly transverse, and the posterior border nearly parallel 

 with the anal region and about -15 of an inch from it. In others the 

 posterioi- border is more curved. One specimen has but three ovarial 

 openings, the rest foui-. The proportionate length of the ambulacral 

 grooves varies considerably, botli in difterent sjtecimens 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 oifset 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 figiire at a con- 

 siderable distance from the postei'ior end, and therefore 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 M. nigi'a, as lie 

 had previously supposed. 



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

 neous. 



Metalia nobilis Ven-m. (p. 319). 



Plagionotus nohilis A. Agassiz, Bulletin Mus. Cump. Zoo)., 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 nobiUs appears to be much more closely allied to 31. ster- 

 nalis, and especially to M Garretii, than to the two tyi)ical species 



