REPORT ON THE AMPHIPODA. 27 



cuius primus et seevndus rotundi et inermes, thoraoe jam majoros ; Articulus tertius oblongiis, 

 utrinque compressus, margine inferiore versus artioulum quartum cuspide valida aucto. 

 ArficuJus qnarfus teres, rectus, oblongiis, tertio parum brevior. Quintus subulatus, acutis- 

 simus, quarto dimidio brevior. Reliqui pedes brevissimi, exilitate aciem oculorura fugientes. 

 Tria posteriora paria deorsum et sursum versa. Color totius ex cinereo albidus. Lnngi- 

 tudo tota, extensis etiam prioribus pedibus, est quinque linearum." From this he passes at 

 once to the genus SquiJla, as follows : — 



" Sqtjilla, Corpus teres, compressum, incurvatum. Thorax brevissimus. Ocidi in lateribus 

 duo, non pedunculati. Antennee quatuor, subulatse. Pedes longitudine inasquales utrinque 

 septem, anticis paribus cheliferis. 



"990. Squilla Cauda eubulata, bifida: pede utrinque antico chelifero ; tribusque utrinque 

 ultimis natatoriis. 



" Cancer macrourus articularis, manibus adactylis, pedibus patentibus, cauda cylindrica bifida. 

 Lmn. Syst. Nat. Ed. 10. gen. 239. n 59. Rosel. Ins. torn. tab. 62. 



"Cancer macrourus rubescens, thorace articulato. Ins. Paris, vol. 2. p. 667. n. 2. tab. '2\. fiy. 6. 



" Krebs-formigen Wasser-wurm. FriscJi. Ins. part. 7. p. 26. §. 28. tab. 18. Jig. 1. 



"Pules marinus. Easter, Opusc. subsec. torn. 2. lib. \. p. 31. tab. Z. fig. 8. 



" Corpius teres, oblongum, latius quam in congenere a me descripta in Actis Helvetids vol. 4. 

 p. 39. et a CL Bastero in Opusc. subsec. torn. 1. Kb. 1. tab. 4. fig. 2. Dorsum curvatum, 

 rotundatum. Caput breve, obtusum. Ocidi in lateribus, atri, minimi, non pedunculati. 

 Antenna;, quatuor incurvatre. Incisuree duodecim requales, l£evissimse, splendid*. Pedum 

 septem paria, quorum primum par articulo eecundo tertioque trunci subnexum, breve, 

 cheliferum, requale, monodactylum : Tria eubsequentia paria omnium longissima, subulata, 

 subsequalia, admodum teretia, articulis quinto, sexto, septimo et octavo trunci subnexa. 

 Reliqui pedes antrorsum flexi teretes, articulis ultimis pilosis subulatis. Cauda Isvis, 

 subulata, bifida, baud longa. Habitat in stagnis aquse dulcis atque salsae. Dorso incum- 

 bens seque natat ac prone, 



"991. SquiUa Cauda subulata Integra : pedibus utrinque anticis binis cheliferis; quatuor subse- 

 quentibus natatoriis reflexis. 



" Cancer macrourus articularis, manibus adactylis, cauda attenuata, spinis bifidis. Linn. Si/st. 

 Nat. Ed. 10. ge7i. 239. w. 56? 



" Pulex marinus. Klein Pise. Miss. v. p. 9. tab. 4. fig. A. B. C. 



" Habitat in Mari Septentrionali. Balasnas vexans mordendo." 



The Iconographia sive Tabularum Explicatio, for pi. xvii. fig. 7, repeats the short definition of 

 Astacus muticiis, No. 989, of which the figure, though only life-size, is easily recognisable as 

 Oniscus volutcdor, Pallas. The elaborate description of the first pair of feet obviously 

 refers to the lower antennae, and this, no doubt, together with the epithet crassipes, quoted 

 by mistake from Pallas, led Linnseus in 1767 to call the species Cancer grossip)es. See 

 Notes on Pallas, 1766, 1772. Possibly the description of the "lateral or exterior" antennae 

 may be derived from the second gnathopods. No. 990 cannot be determined from the 

 inconsistent references or the indefinite description. The statement that "it lives in pools 

 of fresh and salt water" would imply that Gammarus pulex and Gammarus locusta are both 

 in question. The description of the eyes as "minimi" suits neither. Herbst unites it 

 with " Cancer gammarellus, Pallas," probably because Pallas does so. See Note on Pallas, 

 1772. No. 991, by the references, should be a Gai7imarus. The concluding observation 

 points to a Cyamus. It is difficult to fit either to the description. 



