ol 
1897.] Loology. 723 
author’s diagram the nephridia look fragmentary ; there is no regular- 
ity in their length, nor do the numbers of the fragments show evidence 
of bilateral symmetry. But the author himself suggests that the spec- 
imen may be a monstrosity, and that a study of other specimens might 
show both bilateral symmetry and more regularity in the arrangement 
on each side. Such a further study is certainly needed.. Until it is 
made one might very reasonably suppose that it is possible that the 
nemertine nephridia and their ducts are not stable in their arrangement. 
And this supposition would be supported by the fact that in Pauropus, 
—an animal much higher in the scale of life than the nemertine worm 
in question and therefore, according to general opinion, probably less 
likely to vary,—one finds the seminal ducts (metamorphosed nephridia) 
coiled upon themselves and anastomased in a most peculiar, manner with 
no evidenceof bilateral symmetry and showing no evidence of constancy 
of arrangement or in the position of the three small ducts leading from 
the testes in different individuals. Further one frequently finds that 
portions of the large ducts have become cut off from the remainder and 
left without communication with the exterior, very much as is shown 
to be the case with the ductless nephridia in Dr. Montgomery’s figure. 
Description of a Remarkable Japanese Cirripede.—Scat- 
PELLUM SEXCORNUTUM n. sp. General form of capitulum triangular, 
the ventral side nearly straight, dorsal convex ; upper 
whorl of plates perfectly and normally calcified, lower 
whorl with small, peculiar plates. Valves 13. Surface 
everywhere densely and minutely pilose. Carina simply 
bow-shaped, weakly arched, the apex or umbo terminal 
above, roof strongly convex, with “eaves ” or projecting 
caring at the sides, below which the side walls have some 
radial strie. Tergum long, triangular, the carinal mar- 
gin long. All margins rather straight, surface with some 
n radial striation and a wide, but not well defined median 
Scalpellum sex. Tid, the apex erect, pointed. Scutum convex, subtrian- 
cornutum Pils, gular, decidedly less in area than the tergum, the occlu- 
dent margin slightly concave, tergal margin straight, lateral and basal 
margins convex, surface radially striated. Upper latus somewhat tri- 
angular, the umbo above, at the apex; scutal margin long, concave, 
carino-basal margin convex. Rostrum triangular, as wide as long, the 
beak upturned and somewhat projecting. Rostral latus, carinal latus 
and subcarina developed as curved, projecting spikes or horns, small at 
their bases. No infra-median latus or subrostral plate. “Thorax” 
