58 THE, VOYAGE OF H.M.S. CHALLENGER. 



videantur oculis, et duo tantum eommdem paria, pro tribus, adesse credantur. Ex quo forsan 

 prrecipua Locustam inter et Pulicem desutapta f uerit diversitas 1 Corpus anomalo huic 

 Cancro est oblongum, semitereti-compressum, lunato-incurvuni, nudum, Iseve, nitens, semi- 

 diaphanum, articulare ; constans capita absque thorace, turn suturis quatuordecim, utrinque 

 ad latera deflexis; quarum anteriores, septem abdominis, longius tantisper utrinque pro- 

 currentes, marginibus lateralibus rotundatae ; posteriores septem caudre, magis, magisque 

 attenuatoe, oaudam formant longiusculam, inourvam, apice acutiusculam, sursumque subre- 

 curvam; dorso cKterum, longitudinaliter convexum sen teretiusculum est corpus, subtus 

 concavo-caualiculatum. Caput inflexum, oblongum, declive, fronte longitudinaliter convexa, 

 compressum, os versus obtusum, nee rostratum; oculis binis, oblongo-ovalibus, atris, nitentibus, 

 ad summa capitis latera, inter superiores, et inferiores postice antennas, sitis. Antennae 

 duorum parium, sen quatuor, ex summo frontis vertice, autrorsum porrectfe et incurvse, 

 setacese, paribus approximatis ; singulis quadriarticulatis ; superiores longiores, tertiee parti 

 corporis subaequales ; articulis tribus inferioribus crassioribus, teretibus, inaequaliter oblongis, 

 ramulo laterali moniliformi-setaceo ad apicem appendiculatis ; articulo extimo reliquis 

 omnibus longiore moniliformi-setaceo, ciliis adsperso. Inferiores breviores, non nihil 

 superioribus crassiores, iis cfetera simillimse, dempto ramulo laterali. Os inferum, maxilloso- 

 dentatum. Palpi duo, os versus porrecti, articulati, apice uncinati. Pedes quatuordecim, 

 utrinque septem, sub suturis abdominalibus, quorum quatuor antica paria antrorsum, tria 

 vero postioa, eaque longiora, retrorsum versa. Prima omnium duo paria brevissima, quadri- 

 articulata, articulo extimo subcheliformi, tumidiusculo, ovato, extrorsum compresso, apice 

 ungue hamato-uncinato retractili armato ; binis insequentibus paribus sexarticulatis, articulis 

 oblongis, infequalibus, extimo in unguem subulatum abeunte. Tribus denique isosticis 

 paribus, et ipsis sexarticulatis, articulis oblongis, tereti-compressis, femoribus soils incrassatis, 

 ovato-oblongis ; ungue extimi subulato. Pedes omnes per latera ciliati. Suturse tres caudse 

 anteriores singula subtus pari pinnularum pediformium, teretium, semibifidarum, brevium 

 instructce ; extimas contra itidem tres, et ipsse quoque ad lateralem utrinque marginem pinnula 

 pedif ormi natatoria terete bif urea longiuscula retrorsum versa, et velut adscendente, ciliisque 

 adspersa, instructie." 

 The above carefully detailed account probably refers to Gammarus pulex alone, without taking 

 any notice of the other Amphipoda, differing in colour, size, and shape of tail which Wulfen 

 supposed to be merely varieties of it. The Crustacean which he next describes, he calls 

 " Cancer Locusia," the largest of all the Canori he had ever seen, and a specimen of which 

 had cost him two florins in the market of Trieste. He thought Linna3us unlucky in having 

 attributed the name Locusta "non tam peculiar! Cancri alicujus speciei, quam exiguse verius 

 Caucri Pulicis varietati." 



1792. Olivi, Giuseppe, born 1769, died 1795. 



Zoologia Adriatica ossia Catalogo ragionato degli Animali del Golfo e delle 

 Lagune di Venezia ; preceduto da una Dissertazione sulla Storia fisica e naturals 

 del Golfo ; e accompagnato da Memorie, ed Osservazioni di Fisica Storia naturale ed 

 Economia. Bassauo, mdccxcii. 



The Insecta Aptera of the genus Cancer are discussed on pages 41-61. Only two Amphipods 

 are spoken of, one under the title Cancer " Locusta, Linn. sp. 82," the other Cancer 

 "linearis, Linn. sp. 83." Of " C. Locusta" he says "this is the only species of Gamberi 

 or SquiUe indigenous to the Terme Aponesi," and infers therefore that it must be the 

 species inaccurately described and obscurely figured by Sig. Vandolli in the first of his 



