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



grouped under the designations Brachyurus and Macrourus. The second section of the 



Macrouri is defined " Testa thoracem non tegente, brevissima : Manibus adactylis : " and 



may perhaps include the Amphipoda, notwithstanding the pedunculate eyes in the definition 



of Cancer. 



In the preceding group, number 2 is the interesting new genus, which was soon after confounded 



with the Amphipod C?/a?«M6-. It is thus defined : " Oculis IV. Verticalibus ; Corpore inciso 



tuberculato ; Ore tubuloso producto : Ptcnogonum (Fig. 7)." In the German rendering on 



the opposite page it is called " (Strant)Spini?cl (Fig. 7)." The reference should obviously 



have been to Fig. 4. 



In the " Explicatio tabulae aenese " the following account is given : — " Fig. IV. Novum genus, a 



R. D. Strom inter plialangia relatum, Sondm. Tom. 1. p. 209. t. 1 /. 17. Exemplar hujus 



insecti, quod munificentia R. Autoris possideo, ita describo ; Caput 



c'^^n-Aj *"'^'" thorace unitum, tubo h. excavato cylindrico, antice angustiore, 



. -^ ' postice in thoracem recepto, prominens ; Oculi IV. dorsales a. in gib- 



bositate thoracis positi ; c. Antennie 2. tubo breviores moniHformes, 



subtus in segmento thoracis, cui oculi insident, radicatse ; segmenta 



corporis, excepto tubo, IV. cum tuberculo e medio singuli segmenti 



prominulo. Pedes VIII. singuli ex articulis VII. bre?issimis com- 



j)ositi, ungue vaUdo terminati. Ex descriptione patet insectum hoc a 



generibus antea notis omnino difFerre, ideoque novum genus, quod e crebris articulationibus 



Pycnogonum dico, constituit." 



Briinnich's Fig. 4 is here reproduced. 



1764. Geonov, Lorenz Theodor. 



Zoophylacii Gronoviani Fasciculus secundus exhibens enumerationem In- 

 sectorum cpaj in Museo suo adservat, examini subjecit, systematice disposuit atc[ue 

 descripsit Laur. Theod. Gronovius. Additis rarissimorum Insectorum iconismis. 

 Lugduni Batavorum, MDCCLxrv. 



■*o^ 



Among the Insecta Apterahe gives on p. 227 the following : — " Astacus, Corpus suboylindricum, 

 oblongum, articulatum, deorsum inflexum. Thorax trunco multo brevior. Antennx binse, 

 vel sex subulatae, articulatse, tenuissimse. Cauda foliacea, horizontaliter expansilis. Oculi 

 duo, pedunculati, in fronte siti. Pedes utrinque novem vel decern. Posteriora quatuor 

 quinqueve paria curta natatoria. Anteriora longissima, quorum nonnulla plerumque 

 chelifera." 



Under this genus several Podophthakua are included, till on p. 232 he gives the following : — 



" 989. Astacus muticus ; pede utrinque antico subulato, edentulo, longissimo, crassissimo. 



" Astacus (crassipes) cauda inflexa, jsedibus secundi paris tenuibus muticis. Pallas in litieris. 



" Inter medium animal inter Astacum descriptum N. 985, et subsequens genus Squillse. Habitat 

 in aquis substagnantibus prope Lugdunum Batavorum. Tlwrax compressus, liBvis, brevis, 

 latiusculus, postice truncatus ore subtus prominulo. Antennas, quatuor, quarum utrinque 

 lateralis seu exterior corpore parum brevior, attenuata, articulo ultimo in eetam abiente 

 longissimo hispido : interius par brevissimum setaceo-articulatum. Truncus elongatus, 

 compressus, inciu'vus, segmentorum decern, quse utrinque pone pedes (primo pari excepto) in 

 triquetrum acumen abeunt. Cauda angusta, inliexa, expansilis, ejusdem structurse, qua 

 gaudent Astaci sub N. 985-988. descriptL Pedes in universum novem ? Prms ^ar toto 

 corpore longius omniumque pedum maximum, et validissimum, corpori paraUelum, antrorum 

 [antrorsum] protensum, crassum, corpori utrinque sub thorace adnexuiu : hujus paris arti- 



