292 
ZOOLOGICAL LITERATURE. 
II. Posterior pair of pleopoda witli one branch. 
A. Sides of pleon not covered with hair. 
1. The post, pair of pleopoda with a long ciliated process j hand with a 
blunt tooth above the moveable finger. 10. hrevimanus, sp. n. 
2. The post, pair of pleopoda with a much shorter process j hand 
without tooth. 11. Jiliformisj sp. n. 
B. Sides of pleon covered with hair ; two bands on pleon. 
12. vittatuSf Btke. 
[^Apseudes] Rhcea latifronSf sp. n., Insel Lussin, p. 75, from Lussin. Un- 
doubtedly Rhcea (M.-Edw.) is synonymous with Apseudes (Leach), which 
takes priority. 
Tanak loricalm, sp. n., Spence Bate, Proc. Zool. Soc. 1864, p. 668, from 
Esq[uimalt Harbour, Vancouver’s Island. 
Munnopsid^ (Lilljeborg). 
Hr. G. O. Sars says that among the number of new marine 
Crustacea that he has met with during the previous two years, 
there are some belonging to the order Isopoda, the structure 
of which is worthy of notice. The animals are difficult to be 
detected, from their resemblance to the mud in which they are 
found at a considerable depth, and consequently have hithertp 
escaped the observation of natm^alists. They were first noticed 
by the author's father, Prof. Sars (Forhandlinger i Videnskabs- 
Selskabet i Christiania for I860, p. 84), who gave a description 
of one under the name of Mumiopsis typica, as belonging to 
the order Isopoda, and they have been stated by Kroyer to 
have affinity with the genus Munna j but they differ from this 
genus, as well as from the Isopoda generally, both in their com- 
plete want of eyes and in the form and function of the posterior 
three pairs of pereiopoda, which differ fi’om the anterior paii-s by 
being developed into swimming-appendages. 
The author says that there are no less than nine species of 
this form, which ma}' be divided into four genera under the 
general name of Isopoda remigantia, which he thus describes : — 
Coipus divisiones ostendit duas plus minusve distinctas, anteriorem capite 
et segmentis 4 anterioribus pereionis, posteriorem segmentis sequentibus 
tribus pereionis et pleone compositam. Inter ambas constrictio adest ple- 
rumque perspicua. Pleon segmento unico supra convexo constans. Oculi 
nulli. Antennae inaequales, superiores vel interiores parvae in superficie 
dorsali capitis sitae supra interiores, articulo basali niagno et laminari, 
inferiores vel exteriores plerumque valde elongatae, pedunculo 6-articulato, 
articulis 3 primis brevissimis, ulliniis duobus elongatis, flagello multiarti- 
culato. Maxillipedes laminares partes orales fere omnino obtegentea 
extua ad basin lamina magna instructae, 6-articulatae, articulis ultiniis 
duobus chelani efiicientibus plus minusve compietam. Pedes primi paria 
ceteris plerumque breviores, imperfecte prehensilcs ; paria sequentia 3 ambu- 
lutoria siepiuscpio vuldc eloiigata. Petlum paria 3 ulliiuu ceteris valde disai- 
milia, natatoria, articulis plerumque ultiniis plus minusve dilatatis et folia- 
