ARCTURUS INTERMEDIUS. 371 
ISOPODA. ARCTURID. 
NORMALIA. 

ARCTURUS INTERMEDIUS, 
Specific character. Upper antenne longer than the two basal joints of the 
lower; the flagellum minute and obtuse; the fourth segment of the body 
with a double row of small tubercles on each side of both the longitudinal 
hinges of the ventral marsupial pouch, or ovigerous scale. 
Length, four lines and a half. 
Leachia intermedia. H. Goopstr, Edinb. New Phil. Journ. xxxi. p. 309, 
pl. 6, f. 1. Ware, Cat. Brit. Crust. p. 64. Pop. 
Hist. Brit. Crust. p. 222 (Arcturus int.), 
Tue characters of this species were first pointed out 
by the late lamented Harry D. T. Goodsir. It resembles 
A. longicornis, but the peculiar prominent parts of that 
species are more boldly thrown out. ‘The plates on each 
side of the base of the antenne do not project, and their 
infero-anterior angles are acute. The superior antennz 
are longer than the first two joints of the inferior; the 
first joint is globose, the second and third are slender, 
and the flagellum is obtuse. The inferior antennz are 
almost as long as the body; the first joint is as long as 
the head, cylindrical, and having a ridge on its external 
side ; the following joints are more slender, and the last 
joint of the flagellum is finely pointed. 
BB 2 
