CRUSTACEA. 653 
** Anterior feet short, thickened at the apex, furnished with hook in- 
curved. 
Munna Krotryer. External antenne very long. Feet, except 
the first pair, longer than body. Tail destitute of appendages. 
Sp. Munna Backii Kronyer, Tidsskrift, 1. 1839, pp. 612—616, with plate. 
(The specimen, described by KROEYER, seems not to have been full grown). 
Asellus Guorrr., SCHAFFER, LAtTr. External antenne elongate. 
Feet shorter than body. Two abdominal appendages terminated by 
two elongated filaments. 
Sp. Asellus vulgaris Larr., Oniseus aquaticus L., Grorrr. Jns. 11. Pl. 22, 
fig. 2, Dre Gurr Mém. p. s. aU Hist. des Ins. vu. Pl. 31, DEsMaR. Crust. 
Pl. 49, figs. 1, 2, TREvIRANUS Verm. Schr. 1. Tab. x. figs. 56, 57. This 
species is very common in wet ditches, and is almost 3” long. The little 
animal passes the winter in the mud. It differs from the genus Oniscus, to 
which Linn&us united it, in the tail, which is covered above by only a single 
shield-like plate, and further, in the greater development of the middle 
antennz and in the feet, which increase in length from the head to the tail. 
Limnorta Leacu. Four antenne short, subequal. Body cylin- 
drico-linear. 
Sp. Limnoria terebrans LEaocn, Trans. of the Linn. Soc. Xi. pp. 370, 3713; a 
small animal (1—2’”) which perforates the piles and wood-work of marine 
jetties, and in a short time may destroy them. 
B. First pair of feet short, thick, terminated by a didactylous 
chela. 
Apseudes Leacn. ‘Tail composed of six segments, terminated 
by two long filiform appendages of the last pair of feet. 
Sp. Apseudes talpa Luacu, Cancer gammarus talpa Montacu, Trans. of the 
Linn. Soc. 1X. p. 98, Pl. 4, fig. 6 (this figure is copied in the Hncycl. méthod., 
Crust. et Ins. Pl. 336, fig. 26, Desmar. Crust. Pl. 46, fig. 9). MILNE 
Epwarps has given a better figure, Cuv. R. Anim. éd. ill., Crust. Pl. 62, 
fig. I. 
Tanais EDWARDS. 
Sp. Tanais Cavoliniti M1tnE Epwarps, Résumé d’Entom. par MM. Avupouin 
et Epw. (Encyel. portative, 1829), 1. p. 182, Pl. 29, fig. 1, Epw. Hist. nat. 
des Crust. Pl. 31, fig. 6. 
Comp. on this genus Kronyer, Naturh. Tidsskr. tv. 1842, pp. 167—187. 
Tab. It. figs. 1—22. 
Zeuxo TEMPLETON. 
