CRUSTACEA. 653 



* Anterior feet short, thickened at the apex, furnished with hook in- 

 curved. 



Munna KROEYER. External antennas very long. Feet, except 

 the first pair, longer than body. Tail destitute of appendages. 



Sp. Munna Boeclcii KROEYER, Tidsskrift, n. 1839, PP- 612 ^16, with plate. 

 (The specimen, described by KROEYER, seems not to have been full grown). 



Asellus GEOFFR., SCH^EFFER, LATR. External antennae elongate. 

 Feet shorter than body. Two abdominal appendages terminated by 

 two elongated filaments. 



Sp. Asellus vulgaris LATR., Oniscus aquaticus L., GEOFFR. Ins. n. PL 22, 

 fig. 2, DE GEER Mem. p. s. a I'Hist. des Ins. vn. PL 31, DESMAR. Crust. 

 PL 49, figs, i, 2, TREVIRANUS Verm. Schr. i. 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 LINNAEUS 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 

 antennae and in the feet, which increase in length from the head to the tail. 



Limnoria LEACH. Four antennae short, subequal. Body cylin- 

 drico-linear. 



Sp. Limnoria terebrans LEACH, Trans, of the Linn. Soc. xi. pp. 370, 371 ; a 

 small animal (i 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 LEACH. Tail composed of six segments, terminated 

 by two long filiform appendages of the last pair of feet. 



Sp. Apseudes talpa LEACH, Cancer gammarus talpa MONTAGU, Trans, of the 

 Linn. Soc. ix. p. 98, PL 4, fig. 6 (this figure is copied in the Encycl. method., 

 Crust, et Ins. PL 336, fig. -26, DESMAR. Crust. PL 46, fig. 9). MILNE 

 EDWARDS has given a better figure, Cuv. R. Anim. ed. ill., Crust. PL 62, 

 fig. i. 



Tanais EDWARDS. 



Sp. Tanais Cavolinii MILNE EDWARDS, Resume d'Entorn. par MM. AUDOUIN 

 et EDW. (Encycl. portative, 1829), i. p. 182, PL 29, fig. i, EDW. Hist. not. 

 des Crust. PL 31, fig. 6. 



Comp. on this genus KROEYER, Naturh. TidssTcr. iv. 1842, pp. 167 187. 

 Tab. n. figs. i22. 



Zeuxo TEMPLETON. 



