322 THE VOYAGE OF H.M.S. CHALLENGEE. 



from the description and figures of -wliicli his own specimens somewhat varied. His next 

 new species is Pcmtoporeia armaia, which he afterwards named Prisdlla armata. The 

 genus CEdicems, Kroyer, he thinlis should form two separate divisions, one containing 

 sarjinatus, Kr., affinis, Bruz., lynceus, Sars, and norvegicus, n. s., the other novi-zealandlx 

 Dana, and oMusus, Bruz. For the latter division he institutes a new genus, Aceros, using a 

 name pre-occupied among Aves (although there with a diilerent meaning and pronunciation), 

 and taking Aceros obtusus, Bruzelius, as the type, which he afterwards named Aceros 

 plujllonyx, Sars. His new species, (Edicerus norvegicus, he renamed in 1870, Pontocrates 

 norvegicus, giving it as a synonym Kripyeria arenaria, Spence Bate, 1863. Spence Bate's 

 genus is in fact not the pre-occupied Krijiyerich but Kroyera, which perhaps lapsed as a 

 synonym of Monoculodes, and the species Kroyera arenaria dates, not from 1863, hut 

 1858, taking precedence, therefore, of Boeck's norvegicus. Boeck next gives Ampelisca 

 spinipes, n. s., stating that it is very like Ampelisca xquicornis, Bruzelius. For a specimen 

 described by Lilljeborg as LeucotJioe articulosa, Montagu, he proposes a distinct name 

 "Leucothoe Lilljehorgii," which in his later works he hesitates to uphold. He recognises that 

 LeucotJioe articulosa should be called Leucothoe spinicarjM, Abildgaard. Making Prololium, 

 Costa, a synonym of the earlier Stenothoe, Dana, he adds a new species "StenoiJioe Danai," 

 which he afterwards found to be synonymous with Stenothoe {Montagua) marina, Spence 

 Bate, 1855. After pointing out the resemblances between JEusims and Leucothoe, he adds 

 a new species, Eiisinis longipes. For Gammarns brevicornis, Bruzelius, and Gammarus 

 fissicornis, M. Sars, he establishes a new genus, Iduna, a name pre-occupied among Birds 

 and Annelids, and consequently in Boeck's later works giving place to the synonymous 

 Liljeborgia, Sp. Bate, 1862. Iduna brevicarnis he afterwards identified with Liljeborgia 

 pallida, Sp. Bate. To Dexamine he adds a new species, "Dexamine Tliea." For Amphiihoe 

 compressa, Lilljeborg, he establishes the new genus, Epidesura, which was dropped when 

 later on he found the species in question to be Atylus {Amphitlwe) su-ammerdamii, Milne- 

 Edwards, 1830. He makes a new species, "Gammarus Batei," of which no notice is taken in 

 his subsequent works, probably because be thought it too obviously a Gammarus locusta to 

 be worth further mention. To the genus Parampldthoe, Bruzelius, he leaves the species 

 panopla and piulchclla, but establishes a new genus AmpUthopsis to receive the species, 

 bicuspis, elegans, Ixviuscida, tridentata, and the two new species Ampliithopsis glaber and 

 Amphithopsis longicaudata, the former of which he transferred first to Paramphithoe, and 

 afterwards to Pleusfes, retaining the latter as type of the genus Amphithopsis. He discusses 

 the genus Acanfhonotus, Owen, which he afterwards called Acanthonotozoma, and the 

 neighbouring genus, Iphimedia, Eathke. To Acantbosoma, Owen, he assigns the species, 

 Acanthosoma hystrix, Owen, Amphitlwe parasitica, Bats, and Epimeria tricristata, Costa. 

 He afterwards found reason to name the first Acanthozone cuspidata, Lepechin, and the 

 other two, Epimeria ccn-nigera, Fabricius. 



In his third family, Corophidae, Dana, Boeck places a new genus, Podoceropsis, with a new 

 species, " Podocnrop»is Sophia" (afterwards Sophia:), for its type. After some discussion 

 of species which he considers to belong to Leptocheirus, Zaddach, and to Gammaropsis, 

 Lilljeborg, respectively, he describes a new species, Ampliitho'e grandimana, and a new 

 genus, Uela, with a new species, Hela monstrosa, for its type. The name Hela, being 

 pre-occupied, has been changed by S. I. Smith to Neohda. 



The fourth tribe he calls CapriUidea. In it he places Proto pedata, afterwards recognized as 

 P7-oto ventricosa ; yEgina longispina, Kr0yer, he here assigns to Protella, though he after- 

 wards called it ^gina phasma, Montagu, it being properly Protella phasma ; to ^gina, 

 Kroyer, he adds the new species, yEgina (Caprella) echinata, Esmark, which he afterwards 

 claims as his own species, and ^gina leevis, which, according to Mayer, is the young of 

 ^gina longicornis, Kr0yer. He next establishes a new genus, jEginella, with a new 



