318 THE VOYAGE OF H.M.S. CHALLENGER. 



a species found by Kroyer but left indeterminate ; 34. Pontoporeia femorata Ivr0yeT ; 

 35. Pardalisca cuspidata Ivr0yer; 36. "Ampelisca Gaimardii " Kr0yer; 37. "Ampelisca 

 Eschrichtii" Kr0yer; 38. Ampelisca laevigata Liljeb.; 39. Amphithoe serra Kr0yer, with the 

 remark that the fourth .side-plate is much too small in the figure in Kr0yer's Gr0nl, 

 Amphip., it being both in Norwegian and Greenland specimens, -which Sars had examined, 

 double as long as the third and somewhat deeper. 40. Amphithoe cristata (Acanthonotus) 

 Owen, a species said to be very like Amphithoe serra, but still more like a remarkable new 

 species from the coast of Norway, Amphithoe parasitica, which is fully described, the Latin 

 description being : — "A. serrsn affinis, dignoscitiir carina in medio dorso segmenti thoracici 

 qvinti oriunda et usqve ad segmentum qvartum abdominis porreda, postice in qvoque 

 segmento in dentem, triangvlarem acidum desinente; oeulis magnis, paululum ovalihus, 

 convexis ; epimero qvarto et qvinto insolita magnitudine, anterioribus duplo longiorihis, qvarto 

 infra et antice, qvinto infra et postice in spinam fortem conico-acuminatam exeunte (in epimero 

 qvarto uncinatam, in qvinto rectam); pedibtts thoracicis primi et secundi paris magnitudine 

 mediocri et mami subcheliformi prseditis ; antennis fere seqiialibus aut inferioribus paulo 

 longioribus, dimidiam longitudinem corporis parum super antibus." This species was referred 

 to Acanthosoma by Boeck in 1860, to Acanthonotus by Sp. Bate in 1862, and subsequently 

 identified by Boeck with Epimeria cornigera, Fabricius. 

 A full description is given by Sars of Owen's Amphithoe cristata, which " in the short form of the 

 body, the sharp serrate-like back, and strong development of the fourth and fifth side-plates 

 much resembles Amphithoe serra and still more Amphithoe parasiiiea, but is distinguished from 

 both inasmuch as the dorsal carina extends over all the peraon-segments and the four first 

 of the pleon (while in both those species it is wanting on the four first perason-segments) or, 

 as Owen expresses it, ' segmentis 4 anticis in crista continua superne elevatis.' Where, 

 however, the same author adds, ' reliqvis in spinis retrorsum inclinatis productis,' he is so 

 far incorrect as in fact these spines or processes are entirely wanting on the last three 

 abdominal-segments." By Boeck this species is called Acanthonotozoma cristatum. The 

 list continues with 41. Amphithoe hystrix (Acanthosoma) Owen. Comparing his specimens 

 with Kr0yer's description, Gr0nl. Amph., p. 260, Sars was inclined to regard the Norwegian 

 form as a distinct species from the Greenland, but by comparison of these with Owen's 

 figure, which he says is more correct than his short description, he was convinced of the 

 identity of the forms from the two localities. To Kr0yer's description he offers coiTections ; 

 — " Hovedet bar i Midten af Panderanden et meget lidet, men tydeligt, horizontalt, tiJsindet 

 Horn, ikke, som Kr0yer siger, kun en stump Vinkel. De ipverste F^lere ere noget inere end 

 halvt eller nsesten Totrediedele saa lange som de ncderste (efter Kr0yer naae de ikke disses 

 halve Lajngde) ; Skaftets f0rste Led udsender fra Enden af sin 0verste Band en opad og 

 udad rettet steerk og spids Torn, som nxsten cr ligesaa lang som selve Leddet (efter Kr0yer 

 er denne Torn lang mindre) eller som andet Led, det tredie Led er kun halvt saa langt. 

 Svijiben, unders0gt kun hos et enket Exemplar, bestod af 79 Led (efter Kr0yer 'af 20 Led og 

 derover'), af hvilke de 7 (efter Kr. de 4) f0rste Led have i deres underste Band smaa 

 Haarknipper, men af alle de folgende Led viser, som Kr0yer meget rigtigt anforer, kun 

 hvert andct Led Haar og hvert andet er blottet for dem. Sv0bens f0rste Led er af Lsengde 

 som Skaftets tredie Led (efter Kr. er det betydeligt Ifengere). / de nederste Fi^leres Sv^be 

 taltes hos det samme Exemplar 111 Led (efter Kr. bestaaer den ' af i det mindste 50 Led '). 

 Be sijv Brystsegmenter ere, som Kr0yer rigtig fremstiller det, bedsekkede m^d 5 eller, naar 

 man regner Sidepladernes Pig med, 7 Rsekker af Pigge ; Bagkroppens 2 f(j>rste Segmenter 

 vise derimod hvert 9 Pigge (af hvilke de 2 nederste ere de mindste), det tredie 5, det fjerde 

 3, det femte og y'ette 2 (idet Piggen paa Midtlinien af disse Segmenter mangier), og det 

 syvende ingen. Heraf sees, at det rette Forhold ikke rigtigt fremstilles af Kr0yer, naar ban 

 kun augiver 7 Pigge paa Bagkroppens andet Segment og slet ingen paa det femte og sjette. 



