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specimens 1 observed in the 4 1 th foot next to the acicula a 
faintly developed setose bristle. There are heterogomph falcate and 
setose bristles; the setose bristles inseited in the upper half 
of' the fascicle, above the acicula, have the tip of' the shaft less 
developed than those of' the under half'. The falcate bristles do 
not show mucli difï'erence with regard to the number of' their 
denticles. All setae are smoke-colored ; the acicula is black. 
The dorsal cirrus, except at the first setigerous segment, extends 
as a pointed conical appendix somewhat beyond the tip of the 
foot; towards the posterior extremity its dimensions are more 
and more increasing, its length measuring finally one and a half 
the breadth of the body. It arises from the dorsum of' the foot 
like a foliaceous banner, wherein three large vessels could be seen, 
that are United by a network of numerous peripheral branches, 
penetrating into the epidermis until beneath the cuticula. 
In one of the adult specimens I observed ripe eggs, as also have 
been f'ound by Johnson in the Hawaiian-worms ; it may be inferred 
therefrom that they breed in their habitat at Buitenzorg, though 
spermatozoa have not been found neither in our specimens nor 
in those of' Honolulu. According to the American zoologist 
the small L. quadraticeps is hermaphrodite and has eggs and sperma- 
tozoa in the same segment 1 ). L. hawaiiensis therefore ma}" be 
considered es a Nereid, that is quite acclimated at fresh-water 
like as Lycastoides alticola Johns. from a mountain stream of the 
Siërra Laguna, 7000 feet above sea-level and as Nereis limnicola 
Johns. from Lake Merced, presently totally shut off from the 
ocean. However the possibility remains that it is still living also 
in the sea in the neighbourhood of Batavia, like as is the case 
with L. quadraticeps and L. ouanaryensis. 
In view of the litterature of' the genus, that is dispersed in 
several periodicals, some of which are difficult to get, I have 
enumerated in the folowing table the species hitherto known. 
LYCASTIS. 
A. Dorsal cirri not elongated. 
quadraticeps Blanchard, Annélides du Chili, 1848 (Historia 
fisica y politica de Chile, por Claudio Gay); Quatrefages, 
Hist. natur. des Annelés, p. 500. 
Chiloe; Str. of Magellan. Sea and fresh-water. 
1) Biolog. Bulletin, Vol. XIV, 1908, p. 371. 
