AMPI1IP0DA AND ISOPODA OF THE FIRTH OF CLYDE. 37 



Dexamine spinosa, Leach, Edin. Encyc, vol. vii., 

 p. 433. 



Amphithoe Marionis, Milne Edwards, Ann. des Sci. 

 Nat., xx. (1830), p. 375. 



Amphithoe tenuicornis, Rathke, Fauna d. Nor- 

 wegens, Acta Leopold., t. xx. (1843), p. 77, tab. 4, 



fig- 3. 



Amphithoe spinosa, Gosse, Mar. Zool. (1855), p. 144. 



Amphitonotus Marionis, Costa, R. sui Crost. Anifip. 

 d. regno d. Napoli, Mem. d. Real. Accad. d. Sci. di 

 Napoli (1857), p. 195. 



Dexamine tenuicornis, Bruzelius, Skand. Amphip.. 

 Gamm. (1859), p. 79. 



Habitat. — Moderately common all round our shores, 

 generally in a few fathoms of water, and taken not 

 unfrequently in the surface-net. The eye is oblong, 

 slightly arched posteriorly, and slightly concave 

 anteriorly, of a dark red, shading off to a paler 

 red towards the margin. In some cases the whole 

 animal is beautifully dotted with red, and closely 

 studded along the back with white spots made up 

 of small irregular points, some of the spots having 

 a red space in the centre. 



The lower-antennae of the female are about one 

 third shorter than the upper - antenna?, a few 

 knobbed hairs taking the place of the pubescence 

 on the upper surface of the third and fourth joints 

 of the peduncle of the lower-antenna?. The lower- 

 antennas of the male are generally longer than the 

 upper, and have the pubescence on the third and 

 fourth joints. This species may be readily distin- 

 guished by the blunt tooth on the first joint of the 

 upper-antennae. 



DEXAMINE TENUICORNIS, Rathke. 



Dexamine tenuicornis, Rathke, Beitr. zur Fauna 

 Norweg., Nov. Act., xx. (1843), p. 77, pi. xliv., fig. 3. 



Habitat. — Taken at Portloy, Cumbrae, under muddy 

 stones near low-water ; at the Clach Rock, in 



