REPORT ON THE ANNELIDA. 
313 
end to end. It is remarkable that all possess a spicule or spicules. These tubes 
evidently correspond with one found by Count Pourtales off Havana/ and which he 
describes as white, parchment-like, straight, and flattened. It was densely armed 
with spicules of sponges placed transversely, and stiffened by the long threads of 
a Hyalonema attached longitudinally. Only a fragment of the inhabitant was found. 
In section no very evident distinction between this and Nothria conchylcga is 
observed, the chief point being the thicker circular coat and the more complete decus- 
sation of the oblique muscles below the cords. The great size of the nerve-cords and 
ganglia in the small (young ?) examples is noteworthy. 
This form differs in the structure of the feet from such as Onwphis setosa^ Kinberg, 
from the Atlantic, off the estuary of the Rio de la Plata, for though the latter has only a 
single branchial process, it arises in common with the dorsal cirrus. The presence of a 
long ventral cirrus in the Onupliis fragilis of the same author is also diagnostic. 
Nothria sombreriana, n. sp. var. 
A minute fragmentary form, measuring about 9 mm. in length and having a 
diameter of half a millimetre, was dredged with Nothria sombreriana, and though at 
Fig. 70. — Maxillae and mandibles of Nothria, sombreriana, n. sp. var. ? widely separated ; x 90 diameters. 
Pig. 71. — Mandibles of the same, from the ventral aspect ; x 90 diameters. 
first it was thought to be a young variety furnished with a pair of very distinct eyes, 
a closer examination makes its separation probable. Each eye is situated below and 
1 Bull. Mus. Comp. Zobl., vol. i. p. 109 ; also alluded to by Elilers, Ibid., vol. v. p. 273. 
2 6/versigt k. Vetensk.-Akad. Fbrhandl., 1864, p. 560. 
(ZOOL. CHALL. EXP. PART XXXIV, — 1885,) 
LI 40 
