REPORT ON THE AMPHIPODA. 201 



The second portion of the paper deals with the genus Tanais, Milne-Edwards, describing the new 

 species Tanais savinnyi, Tanais edwardsii, Tanais dubins, Tanais gracilis, Tanais tnmmitosus, 

 Tanais orstcdii, Tanais curculio. 



1813. Kr0YER, H. N. 



Om Cyamus Ceti (med et Par Bemserkninger, betrsefFende den mulige Anveu- 

 delse af de paa Hvalerne levende Smaadyr ved Hvalarternes Adskillelse). Natur- 

 historisk Tidsskiift. Ser. 1. B. IV. pp. 474-489. 



Kr0yer says that both Roussel do Vauzume and Milne-Edwards took it for granted that the 

 "Pedicidus Ceti" of Martens, and the " Onisrus Ceti" of Linnaeus, must be the same as one 

 of the three species brought home by the former of these two authors. E. de Vauzfeme 

 thought that his Cyamus ovalis, as being the commonest, must be identical with Cyamus 

 ceti. But the differences are, in fact, so striking that Milne-Edwards chose Cyamus 

 erraticus, E. de V., for identification with Cyamus ceti. Kr0yer therefore gives full 

 accounts of " Cyamus Ceti Linn. (Tab. V. Fig. 63-70) " and " Cyamus erraticus (Tab. V. 

 Fig. 71-76)," to show how distinct they really are. He thinks it probable that the distinc- 

 tions between species of Cyamus may be of use in distinguishing the species of whales 

 which they infest, different species of whales having one or more different species of 

 Cyamus or some other peculiar parasite upon them. Liitken expresses his surprise that 

 Kr0yer, while correcting the errors of others, and offering the ingenious suggestion just 

 mentioned, should have himself made the mistake of supposing that there was only 

 one northern species of whale-louse, and not have recognised that the forms described 

 by Martens and Abildgaard were different species from that which Otto Fabricius had 

 before him. Liitken cannot understand how Ivr0yer came to ignore the article on Cyamus 

 in the " Zoologia Danica," and points out his error in attributing the habitat of Marten's 

 whale-louse to the long-armed Fin-whale, Balxnoptera longimana (Krepokaken), while 

 affirming that no Cyamus has been found on " Balrena Mysticetus," the northern Slsp.thag, 

 Retinal, or Right-Whale, to which, in fact, the Cyamus ceti described by Kr0yer, the 

 Cyamus mijsticeti of Liitken, undoubtedly belongs. 



1843. Kr0YER, H. N. 



Beskiivelse af iiogle Arter og Slsegter af Caprellina ; med indledende Bemaerk- 

 ninger om Lwmodipoda og deres Plads i Systemet. Naturhistorisk Tidsskrift. 

 Ser. 1. Bd. IV. pp. 490-518. 585-616. PL VI. VII. VIII. 1843. 



After remarking on various mistakes and improvements made by his predecessors in the 

 classification of the Lfemodipoda, Kr0yer gives his own opinion that they ought not to 

 constitute a separate order, but to be united with the Araphipoda, as a family of that 

 order. This had been already done by Burmeister, but as he at the same time united the 

 Pycnogonida to the Amphipoda, Kr0yer thinks that his systematic arrangement was not 

 well grounded. Kr0yer points out that the Loemodipoda no less than the Amphipoda 

 have seven segments to the peraeon (Brystringe), the first being always distinguished from 

 the head by a more or less obvious line of demarcation ; the Tnandibles, though sometimes 

 mthout a palp, in some species have a large, three-jointed one; the eyes are not, as 

 Burmeister states, simple, but "consist, as in the Amphipoda, of a number of small 

 pyriform lenses, ensheathed in pigment and covered by a common cornea;" the want 



(ZOOL. CHALL. EXI'. — PART LXVII.^1887.) XxX 26 



