THE HELLERIID/ 425 
characters ascribed to them in the preceding family. The 
first pleopods are absent or reduced to widely separated 
tudiments, of doubtful homology. The pleopods of the 
second, third, fourth, and fifth segments are two-branched ; 
the second pair have the usual stilets in the male. On each 
opercular plate there is a roundish air-cavity placed near 
the outer margin, with a single opening in each operculum 
of the second pleopods, but two openings in those of the 
three following pairs. According to von Ebner, the pe- 
duncle in the pleopods forms a part of the branchial sack, 
so that the two branches instead of being freely articulated 
with it are fastened direct to the segment. The uropods 
are similar to those in the Tylide, but are attached at the 
front corner of the outer margin instead of at its centre. 
The minute terminal joint is considered to be the outer 
branch. 
Helleria, Ebner, 1868, is the only genus, and Helleria 
brevicornis, Ebner, the only species. It occurs in Italy, and 
in the mountain forests of Corsica in damp moss; also M. 
Chevreux has recently sent it me from Cap d’Antibes out 
of his own garden. In 1879 Budde-Lund changed the 
name Helleria to Syspastus, because other genera of Crusta- 
ceans have received the name Helleria, but these other 
genera, as M. Chevreux has pointed out, were named not 
before but after the publication of von Ebner’s genus. It 
would be absurd that Dr. Camil Heller should be entirely 
deprived of the honour intended him, through the fact that 
so many of his friends had separately endeavoured to render 
it. Without question von Ebner’s genus must retain its 
original name, and, with the cancelling of Syspastus, Budde- 
Lund’s family ‘ Syspasti’ naturally suffers a corresponding 
change into Helleriide. The figures on Plate XIX. are 
copied from von Ebner’s paper. 
Family 4.—Oniscidee. 
The animal is seldom very convex or capable of easily 
assuming a globular form. ‘The head is little broader than 
long, and not clearly flanked by the first segment of the 
