CRUSTACEA. 611 
Atya (Atyoidd), ep., very nearly allied to hisidcata (Randall) and tahi- 
tensis (Stimps.), from the Seychelle Islands. Ililgendorf, 1. c. p. 101. 
ralcemon id<B (Heller), from Zanzibar, Ililgendorf, I, c. p. 102, pi. 6. fig. 6. 
Palcemon jamaicensis (Herhst), spinimanus (M.-Edw.) = o^ersw (Wieg- 
mann), and forceps (lSl.-Ptdw.) = acant1mrtis (Wiegm.) are freshwater species 
from Brazil; P. ap>puni, sp. n., from Venezuela; remarks on the genus 
Macrobracliium (Sp. Bate, see preceding volume of the Record, p. 618), and 
a list of the known South- American species of Palcemon, by E. v. Martens, 
Arch. f. Naturgeschichte, xxxv. pp. 22-33, pi. 2. figs. 3-6 (hands of P. sp>ini- 
manus, forcep)S, and appuni). 
Palcemon ensiculus, sp. n.. Smith, Transact. Acad. Connecticut, ii. p. 26, 
pi. 1. fig. 2, and Am. Journ. Sci. and Arts, vol. xlviii. p. 390, Para. — Compa- 
rative measurements of P, jamaicensis (Oliv.) and forceps (M.-Edw.) are given 
hy the same author, ibid. p. 24. 
Palcemonetes, gen. nov. Mandibles as in Anchistia, flagella of the anten- 
nulre as in Palcemon. Type Palcemon varians (Leach, — Palcemon 
antcnnarius (Milne-Edwards, Palcemon lacustris (Martens, 1857) = 
Anchistia migratoria (Heller), living in brackish water on the British shores, 
and in freshwater lakes of Italy, as well as in the Albufera, near Valencia, 
in Spain, and in the Nile. Heller, Zeitschr. f. wiss. Zool. xix. pp. 167-161. 
Xiphopcneus, gen. nov. Rostrum very long and slender; gastrohepatic 
sulcus scarcely perceptible ; lamelliform appendages very small ; aiitennulary 
flagella very long and slender. Fourth and fifth pairs of legs very long, the 
terminal segments very slender and flagelliform. In other respects like 
Peneus (Fabr.). X. hartti, sp. n., from Caravellas, province of Bahia. Smith, 
Transact. Acad. Connecticut, ii. pp. 27-30, pi. 1. fig. 1, and Am. Journ. Sci. 
and Arts, vol. xlviii. p. 390. 
CUMACEA. 
A. Dohrn has examined the structure and development of 
Cmna rathkei (Kroyer), trispinosa {QoodidiY) , plicata , goodsiri 
(Van Beneden as Bodotria), and several others in the Frith of 
the Clyde. These species are found with eggs in the month of 
July. The eggs are very similar to those of the Amphipods 
and Isopods ; also the first stages of development of the^ egg, the 
formation of a fold which penetrates to the middle of the yolk, 
are the same as observed and described in the genus Asellus 
and other Isopods, by the same author ; but during the progress 
of development the animal assumes gradually the shape of a 
Decapod. In the first stage there are two pairs of antend^, the 
first very large, three pairs of buccal organs, and seven pairs of 
bifurcated legs. The outer branch of the first pair oB legs is 
transformed afterwards into the third maxilla, the inner branch 
becoming obsolete ; in the second pair the inner branch only de- 
velopes itself into a maxillary organ ; in the two following the 
inner branches arc stretched forwards on the lower side of the 
body, the outer branches producing the natatory setae ; in the 
last three pairs the inner branch developes itself into normal 
legs; the outer branch becomes obsolete in some species, hn 
others it serves as a tmtatory appendage. The eyes are 
