290 



THE VOYAGE OF H.M.S. CHALLENGER. 



The microscopic structure of the Integumentary Skeleton is discussed ; the process of moulting 

 described ; the fact noticed that the Amphipoda do not appear to be capable of throwing 

 off a wounded limb ; the " auditory ciHa " of the upper antennae are considered; the denticle 

 at the base of the lower antennae is regarded as an olfactory organ ; this is now generally 

 recognized as a duct for the excretion from the antennary gland. The internal structure of 

 an Amphipod is very fuUy described. Some remarks are made upon the development of the 

 young. The paper concludes with a list of all the then known British species, including many 

 new ones in various genera to be subsequently described. The names which do not reappear, 

 or reappear with important changes, in Mr. Spence Bate's list in 1857, are as follows : — 

 Montagua duliius, perhaps represented by " Montagua Alderii ; " SrojJelocheirus hreviatus, 

 for which ajipears Scopelocheirus crenatus ; " Amanonyx Gueriniamw," omitted ; Wesiwoodea 

 coeculus, altered to Westiooodia ccecula ; Weshvoodea carinatus, altered to Kroyera carinata ; 

 Gammarus elegans, altered to UrofJioe elegmis ; TJiersites Guilliamsonia, altered to Thersites 

 Guilliamsoniana ; Podocerus pelagicus, Edwards, omitted ; Siplwnocetus duhms, omitted ; 

 Lxstrigonus Fahreii, Edwards, omitted ; j^gina longispina, Kroyer, referred to Dana's genus, 

 Protella ; Cap)-ella Ixvis, Goodsir, omitted ; Caprella acanthifera. Leach, placed as a 

 synonym of "Caprella acuminifera, Edwards;" Caprella acuHfro7is, Desm., omitted; 

 Caprella phasma, Latr., omitted, " C. Phasma ? (Latr.)," being given as a synonym to 

 Protella longispina. 



Plates xii. to xxii. give valuable illustrations of the structiu'e, both external and internal of the 

 Amphipoda. They do not, however, supply the want of descriptions, so as to give any 

 scientific value to the names of new genera and species here first published. On plate xvi. 

 the terms applied by Milne-Edwards to the seven joints of a leg or equivalent appendage are 

 contrasted with their abbreviated equivalents as used by Mr. Spence Bate, (1) Coxopodite 

 shortened to coxa, (2) Basopodite to basis, (3) IscMopodite to ischium, (4) Meropodite to 

 meros, (5) Oarpopodite to carpus, (6) Propodite to prop>odos, (7) Dactylopodite to daciylos. 



In view of their forthcoming work on the British Sessile-eyed Crustacea, the following Table was 

 drawn up in concert by Messrs. Bate and Westwood on this occasion : — 



Classis Crustacea. Subclassis I. Malacostraca. 



EDRIOPHTHA.LMA (Legio II). " 



Order. Division. SubtUvisiou. Group. Tribe. Family. Division. Subfamily. 



/Saltatoria, OrchestidiE, 



I 

 ( Vagantia, "i 



I l-Natatoria, Gammaridfe, 



(-Gammariua, J 



CNidiflca, Podocerides, 



.Corophiids,] Cerapides, 



[Tubifica,.} c„„phiides, 



-Nonnalia, 



Amphipoda, . 



<-Aberrantia, 



Isonoda \ Normalia. 



" ' t Aberrautia. 



. Domicola, 



1. Stegocephalides, 



2. Lysianassides, . 



3. Tetromatides, . 



4. Pontoporeides, . 



5. Gammarides, . 

 ^6. Leucothoides, . 



r 



1 



Genus. 



Orchestia. 



Montagua. 



Lysianassa. 



Tetromatus. 



Sulcator. 



Gammarus. 



Leucothoe. 



Podocerus. 



Siphonocetus. 

 Corophium. 



L Clielurida; Chelura. 



{Hyperidffi, . 

 Phronimidae, 

 Tyijhidse, . 



Caprellid;?, . 



Hyperia. 



Pnronoma. 



Typhis. 



Caprella. 



