42 CAUL BOVALLIUS, AMPHIPODA HYPERIIDEA. 1. 2. THAUMATOPSID^E. 



1873. Thaumops, R, von WILLEMOES-SUHM. »On a neAv genus of Am- 



phipod Crustaceans)). 



Proc. Roy. Soc. Lond. 



Vol. 21, p. 206. 

 » » 1874. »On a new genus of Am- 



phipod Crustaceans)). Phil. 



Trans. Roy. Soc. Lond. 



Vol. 163, part. 2, p. 629. 

 Thaumatops, » E. v. Martens. 1875. The Zoological Record for 



1873. Crustacea, p. 189. 

 » » C. Bovallius. 1880. »Re marks on the genus Cy- 



steosoma or Thanmat- 



ops». Bih. t. K. Sv. 



Vet. Ak. Handl. Bd. 11. 



N:o 9, p. 5. 

 » » C. Bovallius. 1887. "Systematical list of the Am- 



phipoda Hyperiidea». Bih. 



t. K. Sv. Vet. Ak. Handl. 



Bd. 11. N:o 16, p. 14. 

 » » » 1887. "Arctic and Antarctic Hy- 



perids». Vega-Exp. Ve- 



tensk. Iakttagelser. Bd. 



4, p. 5. 



Iii my previous papers on Amphipoda Hyperiidea I have overlooked the early de- 

 scription of Onisrus spinosus made in 1775 l ) by J. C. Fabricius. Already from the de- 

 scription itself it seems clear that the animal in question is a Thaumatops, this is 

 proved beyond doubt lately by the Rev. Th. Stebbing in his Report on Challenger-Am- 

 phipoda. He has had access to the drawings of the original specimen, belonging to the 

 Museum Banksianum, now preserved in the British Museum, and has compared the drawings 

 with the description of Fabricius and with the Challenger-specimens. To him we thus 

 owe the restoration of the old specific name and its identification with the later names 

 of Guerin-Meneville and v. Willemoes-Suhm. After the thorough examination and 

 comparison made by Stebbing, I think it quite right to follow him in uniting under the 

 old specific name, given by Fabricius, Cystissoma Neptunus, Guerin-Meneville and Thau- 

 mops pellucida, v. Willemoes-Suhm. The species Thaumatops Loveni and Th. longi- 

 pes in the contrary seem to be pretty well distinguished from Thaumatops spinosa, 

 J. 0. Fabricius, at least until a more rich material will provide us with specimens inter- 

 mediate in characteristics. 



Thus the genus contains three species. 



A. The first two pergonal segments are coalesced. The head is longer than the 



first four pera^onal segments - 1. Th. spinosa. 



B. The first two pergonal segments are free, not coalesced. 



b 1. The head is longer than the first four pera?onal segments 2. Th. lougipes. 



b 2. The head is shorter than the first three peraaonal segments... 3. Th. I, mini. 



') Systema Entomologue, p. 298. 



