THE ANNALS 



AND 



MAGAZINE OF NATURAL HISTORY. 



[FOURTH SERIES.] 

 No. 18. JUNE 1869. 



L. — Observations on the Amphtpoda occurring on the Nor- 

 wegian Coasts. By Axel Boeck. 



[Concluded from p. 340.] 



Ampelisca, Kr. — The peduncle of the superior antennas, as 

 in the preceding genera, is generally short and thick, but be- 

 comes much elongated in those which Spence Bate has called 

 Tetrommatus and A. Costa Araneops ; this however, is also 

 the case in the genus Aceros, which consequently forms a 

 transition to this. Dana places this genus among the Ponto- 

 poreinae ; and Spence Bate makes it the type of a distinct sub- 

 family, principally on account of the simple eyes, which it 

 possesses in common with Lilljeborg's nearly allied genus 

 Haploops. In reality these two form a closely united group, 

 well distinguished from the preceding, and the species of which 

 are very nearly related and difficult to distinguish. They 

 nevertheless agree very closely with the preceding genera in 

 the form of their ovigerous and respiratory lamellae. A new 

 species belonging to this genus is 



A. spinipes, mini. — This species, which is 30 millims. long, 

 closely resembles cequicornis, Bruzelius, but differs from it in 

 having the second joint of the superior antenna? longer in pro- 

 portion ; the fifth joint of the peduncle of the inferior antennae 

 is only a little shorter than the fourth, and the number of 

 joints in the flagellum is greater. The second joint of the 

 mandibular palpi is extraordinarily thick. The first two pairs 

 of hands are more strongly armed with setae than in a>quicornis\ 

 the fifth and sixth pairs have the last two joints, which are 

 very long, strongly armed with spines; the second joint of the 

 seventh pair of legs is very long, and the fifth is nearly as long 

 as the preceding three together. The nails are elongate- 

 lanceolate. The two posterior segments of the thorax and the 

 whole of those of the abdomen are keeled. It is not uncommon 



Ann. & Mag. N. Hist. Ser.4. Vol.m. 31 



