A HISTORY OF CORNWALL 



recently been added to the Cornish fauna by Norman and Dr. T. Scott. 1 Tetragoniceps malleolata, 

 Brady, was a new species 'found amongst dredged material from a depth of 12 fathoms inside 

 St. Agnes (Scilly Islands).' 3 Diosaccus tenuicornts (Claus), was taken ' on weeds at low-water-mark, 

 St. Mary's, Scilly.' 3 Of Laophonte serrata (Claus), Dr. Brady says, ' This is by no means a common 

 species. Mr. Robertson and I dredged a few specimens in a depth of I o to 12 fathoms off St. Agnes 

 (Scilly), and likewise took a few amongst weeds at St. Mary's.' 4 L. similis (Claus) was found at the 

 'Scilly Islands, dredged in 14 fathoms, and plentiful on weeds between tide marks' ; 5 L. lamellifera 

 (Claus) was obtained in dredgings from a depth of 2O fathoms among the Scilly Islands; 6 and 

 L. hispida (Brady and Robertson) at the same locality in depths of 10 to 2O fathoms. 7 Laophontina 

 dubia, Norman and Scott, was dredged at St. Mary's in 1 903. Normanella dubla (Brady and Robertson) 

 occurred ' at New Grimsby and Porcressa Bay, Scilly, 14 to 20 fathoms.' 8 Cletodei limicola (Brady), was 

 taken ' amongst the Scilly Islands ' ; C. propinyua, Brady and Robertson, ' In 20 fathoms off St. Mary's, 

 and in 14 fathoms, New Grimsby Harbour ' ; C. linearis (Claus), amongst Algae at St. Mary's. 9 

 Euhydrosoma curvatum (Brady and Robertson) was procured ' off Porcressa Bay and in New Grimsby 

 Harbour (Scilly Islands), dredged in i o to 20 fathoms.' 10 The Arpacticidae in a restricted sense 

 include Dactyhpusia tisboides (Claus) from the 'Scilly Islands, 10 to 40 fathoms'; D. brevicornis 

 (Claus), from the same place, between 2O and 40 fathoms ; and D. stromil (Baird) from the same 

 locality, but procured by the surface net. 11 Concerning the last Brady says : ' Some doubt must 

 rest upon the identification of this with Dr. Baird's Canthocamptus Stromii, but as I am unable to 

 suggest any other species to which Dr. Baird's description might better apply, I follow the nomen- 

 clature adopted by Dr. Claus and Mr. Norman.' Thalestris mysis, Claus, is reported from the 

 'Scilly Islands, dredged in 10 to 12 fathoms, and taken in the surface-net and amongst weeds at 

 low water ' ; and T. rufocincta, Brady, from the same islands at the same depth, ' and also on 

 algae in Porcressa Bay, St. Mary's.' In discussing the localities of T. harpactoides, Claus, Brady 

 says : ' I have a single specimen, apparently belonging to the same species, which was dredged 

 amongst the Scilly Islands.' There also he took T. c/ausii, Norman, and of T. serru/ata, Brady, a 

 single specimen, a male, was ' dredged on a bottom of muddy sand in New Grimsby Harbour, at a 

 depth of 14 fathoms.' T. longimana, Claus, was dredged by Brady abundantly at these islands, and 

 also got in the surface-net. Of T. peltata (Boeck) ' one specimen only was found in dredged 

 material from a depth of 40 fathoms off St. Agnes.' 12 Westwoodia nobilis (Baird) was found by 

 Brady 'near St. Agnes (Scilly), 10 to 12 fathoms,' 13 and is also recorded by Cocks as Arpacticus 

 nobilii (Baird) from ' Ponds on rocks, Gwyllyn-vase.' Arpacticus chelifer (O.F.M.) was found by 

 Brady in the Scilly Islands, 14 and by Cocks ' In sea-water from Green Bank.' A. flexus, Brady and 

 Robertson, was 'dredged in depths of 10 to 2O fathoms amongst the Scilly Islands ' ; Zaus spinatus, 

 Goodsir, 'in 10 to 12 fathoms' ; Alteutha crenu/ata, Brady (assigned in the first instance to Peltldium\ 

 was found ' On Algae near low-water mark at St. Mary's and St. Agnes (Scilly Islands), where it 

 was also taken in the surface-net in the evening.' 1( Peltidium conspicuum, Norman and Scott, was 

 taken in New Grimsby Harbour in 1903. To the Porcellidiidae are assigned Porcellidium tenuicauda, 

 Claus, 'One specimen dredged off St. Agnes (Scilly) in a depth of 10 fathoms' ; P. fimbriatum, 

 Claus, and P. viride (Philippi), both from St. Mary's. 16 In the Idyidae stand Scutellidium tisboides, 

 Claus, found ' on weeds in Porcressa Bay,' and S. fasciatum (Boeck), also from the Scilly Islands. 17 



To the Thaumatoessidae (otherwise called Monstrillidae) belongs Monstrilla rigida, Thompson, 

 to the Corycaeidae Corycaeus anglicus, Lubbock, both rare species, recorded by Vallentin from 

 Falmouth. 



Under the Ascidicolidae Canu brings the species Notodelphys allmani, Thorell. Cocks records 

 this as N. ascidicola, Allman ; but Allman's specific name has been rejected by later authors on the 

 ground that under it two or more species had been inextricably con fused together. To the Asterocheridae 

 belong Dyspontius striatus, Thorell, and Acontiophorus scutatus (Brady and Robertson), ' both dredged 

 in a depth of 40 fathoms off St. Agnes.' 1B In Giesbrecht's opinion the puzzling Nicothoe astaci, 

 Audouin and Milne-Edwards, should stand near to this family. It is parasitic ' on the gills of the 

 common lobster,' as recorded by Cocks, who supposes himself to have discovered a variety, which, 

 however, he does not describe. That industrious collector further gives the names of nine species 

 of the Copepoda commonly known as fish-lice, some of which attain a much larger size than what 

 is common in the free-living species. Their vagaries of form no doubt add some difficulty to the 

 study, but at the same time they stimulate observation by their oddness and help to lift this particular 



1 Ann. Nat. Hist. Ser. 7, vol. xv, 284. * Man. Brit. Cop. vol. ii, p. 67. 



3 Ibid. p. 70. Ibid. p. 73. 5 Ibid. p. 79. 



Ibid. p. 84. 7 Ibid. p. 86. 8 Ibid. p. 88. 



' Ibid. pp. 92, 94, 97. 10 Ibid. p. 100. " Ibid. pp. 108, 119, 114. 



11 For the species of 'Thalestris, see Man. Brit. Cop. vol. ii, pp. 123-139. 



13 Ibid. p. 142. u Ibid. p. 149. 15 Ibid. pp. 152, 155, 164. 



16 Ibid. pp. 166-168. 17 Ibid. pp. 177, 1 80. ls Ibid. vol. iii, 67, 71. 



286 



