42 CARL BOYALLIUS, AMPHIPODA HYPERIIDEA. 1. 2. THAUMATOPSID^. 



1873. Thamnops, R. von WILLEMOÉS-SUHM. »On a new genus of Am- 



phipod Crustaceans». 



Proc. Roy. Soc. Lond. 



Vol. 21, p. 206. 

 » » 1874. "On a new genus of Am- 



phipod Crustaceans»: Phil. 



Traus. Roy. Soc. Lond. 



Vol. 16.3, part. 2, p. 629. 

 Thaainatops, » E. v. Maktens. 1875. Tlie Zoological Reeord for 



1873. Crustacea, p. 189. 

 » » C. BovALLius. 1886. »Remarks on the genus Cy- 



steosoma or Thaumat- 



ops». Bill. t. K. Sv. 



Vet. Ak. Handl. Bd. 11. 



N:o 9, p. 5. 

 » » C. BovALLius. 1887. »Systeniatical list of the Am- 



phipoda Hyperiidea». Bill. 



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



Bd. 11. N:ol6, p. 14. 

 » B » 1887. »Arctic and Antarctie Hy- 



perids». Vega-Exp. Ve- 



tensk. Iakttagelser. Bd. 



4, p. 5. 



In my previous papers on Ampliipoda Hyperiidea I have overlooked the early de- 

 scription of Onisciis ftpinos^is made in 1775^) by J. 0. Fabricius. Already from the de- 

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

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

 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 låter names 

 of GuÉRiN-MÉNEvii.LE and v. WiLLEMOES-SuHM. After the thorough examination and 

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

 (jld specific name, given by Fabricius, Cystissoma iSfeptunus, Guérin-Méneville and Tluva- 

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

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

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

 mediate in characteristics. 



Thus the genus contains three species. 



A. Tlie fir.st two pera3onal segments are coalesced. The heatl is longer than the 



first fonr pei-fconal segments 1. Tli. spiiiosa. 



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



b 1. Tlie head is longer than the first four pei-ffional segments 2. Tli. loiigipes. 



b 2. The head is shorter than the first three perreonal segments .- 3. Tli. Liivéiii. 



') Systema Entoniologire, p. 298. 



