— 22 — 



i6. Norman (A. M.), On the Crustacea, Tunicata, Poly\oa, Echinodermata, Actinoioa, 

 Hydroioa and Porifera, Shetland final dredging report, part, ii, Report of the 38"' 

 meeting of the British assoc. for advanc. of science for 1868. London 1869. 



17. Pennant fT.), British ■{oology. London 1777. 



18. Théel (Hjalmar), Report on the scientijlc results ofthe voyage of H. M. S. Challenger 



duringtheyearsiSjS-iSjG. Zoology, vol. 4, part. xiii. Report on the Holothurioidea. 

 Edinburg 1881 . 



19. Théel (Hjalmar), Reports on the scientijic results ofthe voyage of H. M. S. Challenger 



during the years j8']3-i8']6. Zoology, vol. 14, part, xxxix. Report on the Holothu- 

 rioidea. Edinburg i885. 



20. Théel (Hjalmar), Repotts on the results of dredging, iinder the supervision of Alexander 



Agassi\ in the Gulf of Mexico (iSyy-jS), in the Caribbean sea {ï8iq-8o), and along 

 the eastern coast of the United States during the summer of 1880, hy the U. S. coast 

 survey steamer Blake, Lient. Commander C. D. Sigsbee, U. S. N. and Commander 

 J. R. Bartlett, U. S. N. Commanding, xxx. Report on the Holothurioidea, Bull. Mus, 

 Comp. Zool. Harvard Collège, vol. i3, n° i. Cambridge 1! 



21. Troschel (F. H.), Neue Holothurien-Gattungen, Archiv. fiir Naturgesch. 12^^ ann. 

 vol. I. Berlin 1846. 



