CRUSTACEA -- ISOPODA. 



ISOPODA. 



IDOTEIDES. New species of Idotea are, /. Lichtensteinii, Krauss (1. c.), 

 from the Cape (Table Bay), and /. gmnulosa, I. brevicornis, Rathke (1. c,), 

 from the coasts of Norway ; /. trulentata, Lat., also, wliieh occurs abun- 

 clautly in the same locality, has been more particularly described, and distin- 

 guished from /. Hasten, And. 



ASELLOTA. A new genus, Crossurus, has been instituted by Rathke 

 (1. c.) : Tour rather thick antennse, the outer longer than the inner, body 

 elongated, convex above, tail with two half bands of mimerous hairs, like 

 fringes, with short, jointed appendages at the point. The first pair, very strong 

 nipper-feet, the rest slender and ambulatory. Six branchial lamellae with corre- 

 sponding opercular lamella?. V. vittaius, 2 '" long, found near Molde, on oysters. 



ONISCIDES. A detailed description of the external and internal confor- 

 mation of Liffidium Persooni, Brandt, has been given by Lereboullet. (Ann. 

 d Sc. Nat. xii, p. 103, pi. 45.) 



Ti/los has been enriched with two new species, by Krauss (1. c.) : T. gra- 

 nitlnti's and capensis, from Table Bay. 



SPH.EROMIDES. The same author (ib.), among five South African species 

 of Splurroma, has described a new species, Sph. macrocephala, Kr., from the 

 coast of Natal. 



White (Ann. Nat. Hist, xii, p. 345) has described Sphteroma gigas, var. 

 lanceolata, from the Falkland Islands. 



A preliminary notice has been given by Milne Edwards (Ann. d. Sc. Nat. 

 xx. p. 326) of two new fossil forms. The one, Palceoniscus Brongniartii, 

 from the green marl of the Paris basin, belongs decidedly to the Spha3ro- 

 mides, though it cannot be assigned to any existing genus. The other, 

 Archeoniscus (Brodii), found by Brodie, in Wiltshire, appears rather to belong 

 to the Cymothoada, in many respects it comes near Serolis in particular. 



CYMOTHOADA. A detailed description of the external and internal 

 structure of JEga bicarinata, Leach, has been given by Rathke (1. c.) 



EPICAHIDES. He (ib.) has instituted a new genus of this family, 

 Phryxus, nearly allied to Bopyrus, but differing in the large bilobed branchiae 

 of the female. Two species infest Crabs, viz. Phr. Hippolytes, on Hipp, len- 

 tifj'mosa, R., and Phr. Paguri, on P. Bernhardi. The former species is 

 identical with Kroyer's Bopyrus abdominalis (vid. Report for 1840) ; who 

 overlooked the division of the branchiae, but has so beautifully represented 

 the history of the later development ; whilst the history of the earlier stages 

 of development within the marsupial cavity of the mother has been pursued 

 further by Rathke. 



