SCHIZOPODS OF THE HAWAIIAN ISLANDS. 
967 
lutely identical with Caiman’s account and figure (fig. 26). Also the general shape of the abdomen 
corresponds to that of this species-; the telson is damaged. A more minute investigation of the other 
characters (chiefly those of generic value) was not advisable, since only one individual is at hand, 
and this in very poor state of preservation. The only difference noticed is that the antennal scale is 
slightly longer than in Caiman’s species, reaching to the middle of the third joint of the peduncle. 
Station: 4005, 577-480 fathoms, vicinity of Kauai Island, 1 specimen. 
Distribution. — Found so far only at the southwest coast of Ireland in 1,020 fathoms, and Bay of 
Biscay, 237-1,000 fathoms (Caiman), and subtropical Atlantic between Gibraltar, Azores, and Canary 
Islands (Hansen). 
Order MYSIDACEA Boas. 
Family L0PH0GASTRIDA G. 0. Sars. 
Genus LOPHOGASTER M. Sars. 
9. Lophogaster typicus M. Sars. 
Lophogaster typicus M. Sars, in Forh. Skand. Naturf. Moede Christiania, 1856, 160. M. Sars, in 
Christiania Univ. Progr., 1862, 1, pi. 1-3. G. O. Sars, Rep. Voy. Challenger, 13, 14, pi. 1, f. 
1-7, 1885. Norman, in Ann. Nat. Hist. (6) 9, 459, 1892. Caullery, in Ann. Univ. Lyon, fasc. 2, 
1896, 367. Walker, in Trans. Liverpool Biol. Soc. 12, 1898, 164. Holt & Beaumont, in Trans. 
Roy. Dublin Soc. (2) 7, part 7, 1900, 3. Thompson, Catal. Crust. & Pycnog. Mus. Dundee, 23, 
1901. Lo Bianco, Pelag. Tiefseefisch. Maja, 33, pi. 12, f. 44, 1904. 
Ctenomysis alata Norman, in Rep. Brit. Assoc. , 1861, 151. 
The discovery of a Lophogaster at the Hawaiian Islands made necessary a close investigation of its 
relation to the known form of the Atlantic. The abundant material at hand rendered this a compara- 
tively easy task, and it was found that the present form agrees very closely with . the descriptions 
furnished by M. and G. O. Sars for the Norwegian and the Cape forms. Only a few remarks seem 
necessary. 
( 1) The rostral spine is generally in our material a little longer than in the typical form, but there 
is considerable variation in this respect, as has already been pointed out by G. O. Sars. In a few of 
the present specimens, the rostrum does not differ from the typical shape, but in most cases it is slightly 
longer, although falling short of the end of the peduncle of the antennules. Sometimes, however, it 
reaches the end of the latter, and even surpasses it, as is most distinctly the case in the large female 
from station 3965. 
(2) In most of our specimens, there is only 1 small lateral denticle on either margin of the telson 
while there are 3 in the typical form. In fact, I found only 1 denticle in all the younger specimen s 
examined (I examined a large number from station 4101, although not all of them); in the large 
female from station 3965, however, there are 3 denticles, as usual. 
(3) Most of our specimens do not seem to be fully adult; those of stations 3847,. 3858 and 4101 
hardly surpass 20 mm. (one of 3858 is 22 mm.), and generally the males are a little larger than the 
females, as has been stated by Sars for the typical form. The male from station 3857 is 24 mm. long, 
and the female from 3965 is 28 mm. This latter, consequently, exceeds all measurements previously 
given. Nevertheless, the much smaller females from station 4101 seem to be adult — at least, are able to 
propagate, since the marsupium is full in some of them. 
(4) The lateral wings of the carapace are produced posteriorly- into a point, which is more or less 
distinctly spiniform, most distinctly so in the large female from station 3965. 
(5) The outer margin of the antennal scale has 3 to 5 teeth, a variation already noticed by Sars. 
1 have found that this number may even differ on the right and left side of the same individual. 
None of the above aberrations justify the creation of a new species, not even of a variety. Although 
there is a tendency in the Hawaiian form to develop a longer rostrum and to reduce the number of the 
marginal denticles of the telson, this furnishes no constant characters, the normal conditions being 
found at least in some specimens. 
Stations: 3847, 23 to 24 fathoms, south coast of Molokai, 2 males; 3857, 127 to 128 fathoms, Pailolo 
Channel, 1 male; 3858, 128 to 138 fathoms, Pailolo Channel, 9 males; 3884, 284 to 290 fathoms, Pailolo 
Channel, 1 male; 3965, 147 to 116 fathoms, vicinity of Laysan Island, 1 female; 4101, 143 to 122 fathoms, 
Pailolo Channel, numerous specimens, male and female, males much more abundant, 
