PSAMATHE. TISBE. 183 



the exterior half of the distal edge ; the second seta from the 

 outside is rather longer than the others (PI. XX. fig. 7). 

 Length of the specimen '82 mm. (about ^ of an inch). 



PSAMATHE LONGICAUDA, Philippi. 



1840. Psamathe lonqicauda, Philippi, Wiegm. Archiv f. Naturgesch. 



Jahrg. 6, p. 189, pi. iv. tig. 1. 

 1866. St'utfliidiutn tishoides, Glaus, Die Copepodenfauna von Nizza, 



p. 21, pi. iv. figs. 8-15. 

 1880. Scutellidium tisboides, Bradv, vol. ii. p. 175, pi. Ixviii. 



figs. 1-10. 

 1905. Psamathe longicauda, G. 0. Sars, p. 83, pi. xlix. 



This was observed very sparingly in gatherings from 

 Salcombe, Plymouth, and St. Mary's, Scilly Islands. It is 

 recorded from Porcrasa Bay, Scilly Islands, by Dr. Brady. 



ASPIDISCUS FASCIATUS, Norman. 



1869. Aspidiscusfasciatus, Norman, British Assoc. Report for 1868, 



p. 298. 

 1905. Aspidiscusfasciatus, G. 0. Sars, p. 81, pi. xlviii. 



What appears to be this species was found in one or two 

 places, but not very plentifully ; it occurred in samples from 

 Exmouth, Plymouth, and the Harbour at St. Mary's, Scilly 

 Islands. 



Genus TISBE, Lilljeborg. 



There is some difficulty with respect to the name of this 

 genus. The genus Idya, Philippi, 1843, cannot be used, as 

 there is a genus of earlier date, /<///, Freminville, 1809, still 

 in use in Acalephse. Tisl>e, Lilljeborg, 1853, would have been 

 more correctly written Thisbe ; but there is a TJiisbe, Hiibner, 

 among Lepidoptera, 1816. It appears to us therefore that the 

 genus should be retained with the spelling which Lilljeborg 

 gave it, and which is sufficient to d'stinguish it from Thisbe. 



TISBE FUHCATA (Baird). 



1837. Cyclops furcatus, Baird, Mag. Zool. and Bot. vol. i. p. 330, 



pi. ix. tigs. 26-28. 

 1850. Canthocamptus furcatus, Baird, p. 210, pis. xxv. figs. 1, 2; 



xxx. figs. 4, 5, 6. 



1880. Idya furcata, Brady, vol. ii. p. 172, pi. Ixvii. figs. 1-11. 

 1905. Idyafurcata, G. O. Sars, p. 88, pis. Ii., lii. fig. 1. 



Generally distributed. Exmouth, Salcombe, Plymouth, 

 Fowey. and Scilly Isles. 



