LIMNORIA. 2:27 



Gen. 111. TANAIS, Milne- Edwards. 



Similar in many respects to the last. Antennas very short, 

 without many-jointed thread at the end. Second pair of 

 legs similar to the following pair. The three first rings of 

 abdomen more developed than the following. 



Tanais Dulongii, Audouin, sp."* — Upper antennas much 

 thicker, but scarcely longer than the lower. Five last pairs 

 of legs nearly of the same length. Abdomen without hairs 

 on the sides. Two lines long. 



Irish coast, Giant's Causeway (W. Thompson) . 



Gen. 112. LIMNOEIA, Leach. 



Body capable of being contracted nearly into a ball. 

 Eyes distinct, granular. Tail of many segments, scarcely 

 narrower than the body, the last somewhat rounded. An- 

 tennas in pairs, one placed over the other. 



Limnoria lignorum, Rathke, sp. Boring Limnoria. 

 (Plate XII. fig. 5.) — Body ash-coloured; eyes dark-brown. 



Woodwork in the sea. Common. 



This very destructive little boring creature was first 



* "Westwood proposes to separate this species under the name or' Aniso- 

 ckeirus. Ann. Sc. Nat. xxvii. p. 330. 



