ARCTURUS INTERMED1US. 



371 



ISOPODA. 



NORM ALIA. 



AROTURID^E. 



ARCTURUS INTERMEDIUS. 



Specific character. Upper antennae 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. GOODSIR, Edinb. New Phil. Journ, xxxi. p. 309, 



pi. 6, f, 1. WHITE, Cat. Brit. Crust, p. 64. Pop. 

 Hist. Brit. Crust, p. 222 (Arcturus int.). 



THE 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 antennae do not project, and their 

 infero-anterior angles are acute. The superior antennae 

 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 antennas 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. 



B B 2 



