REPORT ON THE AMPHIPOBA. 23 



" Merref. pin, p. 192. Squilla fluviatilis. Squilla jjarva. 



" Rosel. ins. vol. 3, supplem. tah. 62. 



" La crevette des ruisseaux. Longueur 7 lignes. Largeur 2 lignes. 



" Cette crevette est d'un jaune couleur de rouille ; ses yeus sont noirs ; ses antennes sont fines 

 et assez longues, k peu pres de la longueur des deux tiers du corps. EUe a cinq pattes de 

 chaque cote & plusieurs appendices h, la queue. Tout son corps est compose de douze anneaux 

 sans la tete ; quatre de ces anneaux composent le corcelet, qui dans I'ecrevisse est d'une seule 

 piece. Cette crevette est applatie par les cotes ; aussi est elle toujours posee sur le cot^ 

 soit qu'elle se meuve, soit qu'elle reste en place, & lorsqu'elle marche, elle approche par des 

 mouvemens vifs sa tete &. sa queue I'une de I'autre. 



" Ou trouve commun^ment cette crevette dans I'eau courante des petits ruisseaux, elle est en 

 grande quantity dans la riviere des Gobelins. Souvent les plus petites se retirent & se 

 mettent a I'abri sous le ventre & entre les pattes des plus grosses." 



The figures, life-size and enlarged, are here reproduced. It is obvious that Eosel's species 

 Astacus (Squilla) fluviatilis, is represented, though Geoffroyis probably describing Ganimarus 

 pulex. Boeck rather singularly remarks, " Denue Afbildung er kopieret af Siilzer (2.53). 

 Tab. xxiii. Fig. 152," the number 253 being a reference to the title of Sulzer's work in 1761, 

 of which Boeck takes no further notice. The figure in question has fourteen segments, 

 independently of head or telson, which is obviously one too many, although in agreement 

 with Riisel's description. The last seven are strongly dentate medio-dorsally. The figure, 

 being a striking one, was frequently repeated, without regard to its accuracy or its fitting 

 the species, the description of which it was supposed to illustrate. Herbst in his large 

 work, Bosc in his small one, alike use it, the former for Cancer {Gammarellus) pulex, the 

 latter for La Crevette des ruisseaux, Ganimarus pulex. An interesting discussion of the 

 subject will be found in Bate and Westwood, Brit. Sess. Crust,, vol. i. pp. 388-396. 



Geoffroy shows in the figure a series of seven feet, but does not take the trouble to reconcile this 

 with the definition which he gives of Cancer, including " Dix pattes, les deux premieres en 

 forme de pinces." On the contrary, he describes his species as having " cinq pattes de 

 chaque cote." The statement that the body is composed of twelve annuli without the head, 

 is an improvement upon Eosel's account, but all the same not in agreement with the 

 figure. 



1762. Gronov, Lorenz Theodoe. 



Acta Helvetica, Physico-matlieraatico-anatomico-botanico-medica figuris teneis 

 illustrata, et in ilsus publicos exarata. Volumen V. Basiled, mdcclxii. 



Pages 353-382 contain "Animalium Belgicorum a Laur. Theod. Gronovio observatorum 

 Centuria quinta." In this century of animals he describes, "455. j4stacd8 muticus; 

 pede utrinque antico subulato, edentulo, longissimo, crassissimo," of which he re- 

 peats the full accoimt in his later work. (See Note on Gronov, 1764.) "456. 

 Squilla cauda nulla" is his Squilla acatidafa of 1760, to which he refers. "457. 

 Squilla cauda nulla? pedibus quatuordecim, tertio quartoque paribus vesicaeformibus 

 natatoriis" is referred to Baster's "Animal in coraUiis." "458. Squilla cauda subulata, 

 bifida: pedibus utrinque anticis binis clieliferis; quatuor subsequentibus natatoriis 

 longissimis" is referred to Cancer macrourus, &c., Linn. Sijst. gen. 239, n. 59, and to the 

 " Krebsformiger Wasser-Wimn. Frisch. Ins. Germ.,p)art. 7. ^;. 26. § 18. Tah. 18. fig. 1." 

 The fuU description is repeated in his larger work almost verbatim. "459. Squilla 

 Cauda subulata integra : pedibus utrinque anticis binis cheliferis : quatuor subsequentibus 

 natatoriis longioribus" is referred to Cancer macrourus, &c., Linn. Syst. gen., 239, n. 56? 



