1896.] FROM THE SANDWICH ISLANDS. 197 
throughout. On the very first seta-bearing segment of the body 
the sete have precisely the same ridged free extremities that the 
setz upon the clitellum show. At first the sete of each pair are 
fairly close together. Later they get farther apart and become 
irregular in arrangement, as in Pontoscolex corethrurus. On the 
elitellum the ventral pairs are quite regular, although each indi- 
vidual seta of the pair is farther away from its fellow than 
anteriorly. This continues for a short distance behind the 
clitellum. On the other hand, the lateral pairs of sete are irregular 
in the clitellar region. The ventral of the two setw, however, which 
ison a line with the nephridiopore, is fixed in position: it is the 
other which varies. 
The clitellum occupies segments xiv.-xxi. with a portion of xiii. 
and xxii. 
The dorsal vessel is in certain respects peculiar’. Where it 
emerges from the last thick mesentery it is moderately thin; it 
gradually becomes thicker and at the same time moniliform; the 
increased thickness is due to the fact that the dorsal vessel 
becomes double; its character is that of the dorsal vessel in 
Acanthodrilus nove-zelandie, i.e. the tube is single where it 
traverses the septa, but separates into two halves between the 
septa. In segments xiv. and xv. the dorsal vessel attains to its 
greatest bulk; after this its calibre becomes suddenly diminished. 
lt retains, however, its double character. 
In segments xi., xii. are hearts which seem to have no con- 
nection with the dorsal vessel but only with the supra-intestinal. 
The gizzard is in segment y.; it is followed by tour very thick 
septa. In the segments following the gizzard are 3 pairs of calci- 
ferous glands. Behind the first three strong septa are very small 
spermatothece, simple elongate oval pouches without diverticula. 
Hab. Mauna Loa, Hawaii, and Waiahia, Oahu. 
Pericheeta indica, Horst. 
Dr. Michaelsen has called attention * to the fact that this species, 
which is very widely distributed, is frequently without a * prostate” 
gland. In five specimens which he received from Georgia and 
Florida there was no trace of the gland, only the muscular duct 
being present. In the 6th specimen the gland was present on 
one side. Dr. Michaelsen further makes the suggestion that the 
original home of the species may be Japan, where as a general 
rule* the Perichete show the same character. 
Among the worms collected by Mr. Perkins were 8 examples 
of this species from Molokai, all fully mature; I dissected seven of 
them, in none of which was there the least trace of the gland in 
question ; the curved duct alone was present. 
1 In one specimen of three which I examined, the dorsal vessel seemed to be 
single. 
Pu Die Regenwurm-Fauna yon Florida u. Georgia,’ Zool. JB., Bd. viii. 
. 177. 
Ps F. E. Beddard ‘On some Perichztide from Japan,” ibid. Bd. vi. p. 755, 
