13 Crust. 
CRUSTACEA. 
Armadillidium or Glomeris, it seems very probable that the TrilohitCB 
were provided with feet for locomotion ; but whether these were foli- 
aceous or styliform, soft or solid, horaonomous or heteronomous, cannot 
be decided from the materials at present known, and therefore the real 
affinity of the Trilobites to other orders of the Crustacea must be left 
undecided. The known Tritohitce form rather a retrograde than a pro- 
gressive series, as regards time ; in the individual development the 
number of segments is increasing, but this number is larger in the geo- 
logically oldest than in the more recent forms (pp. 1208-1224 & 1306). 
An abstract of this author’s views on the systematic position of Limulus 
and the Trilobites [Zool. Rec. xv. Crust, p. 46], in Naturforscher, xii. 
pp. 337 & 338, by the Recoudek. 
DEOAPODA. 
J. Boas, Zool. Anz. ii. p. 257, proposes to classify the Decapoda aa 
follows : — 
1. Reptantia, containing the Brachyura, Anomura^ Palinuridce, ScyL 
laridte, Astacidoi, and Thalassinidce. 
2. Natantia — (a) Eukyphota. All Carides except the Penceidce. 
(b) Penatidce. 
Oxyrrhyncha. 
B. F. Mieus, J. L. S. xiv. pp. 634-671, after recapitulating the syste- 
matic arrangements of former authors, proposes the following, giving short 
differential diagnoses for all genera ; — 
Family 1. — Inachid.®. Eyes nou-retractile, or retractile against the 
sides of the carapace ; no defined orbits. Basal joint of antennse 
usually slender. 
Sub-family 1. — Leptopodiince. Eyes slender, laterally projecting, not 
retractile ; prseocular and postocular spines minute or wanting. 
Basal antennal joint very slender throughout its length. Lepto- 
podia (Leach), Metoporaphis (Stimps.), Stenorrhyiichus* (Lam.), 
Achceus (Leach), Podochela (Stimps.), Podonema (Stimps.). 
Sub-family 2. — Inachince. Eyes slender and retractile ; praeocular 
spine usually wanting, postocular usually distinct. Basal 
antennal joint very slender throughout its length : Eucinetops 
(Stimps.), Collodes (Stimps.), Arachnopsis (Stimps.), Batracho- 
notus (Stimps.), Euprognatha (Stimps.), Achceopsis (Stimps.), 
Inachus (Fab.), Oncinopus (Haan), Inachoides (M.-Edw.), Eury- 
podius (Gudr.), Oregonia* (Dana), Plistacantha (Miers), Halimus 
(Latr.), Amathia (Roux), Chorimis (Leach), Macrochira (Haan), 
Trichoplatus (A. Milue-Edw.). 
Sub-family 3. — Acanthonychince. Eyes small, concealed beneath the 
prominent praeocular spine. Basal antennal joint usually 
enlarged at base. Xenocarcmus ^ (White), Anomalothir (n.), 
Mocosoa (Stimps.), Trigonothlr (u.), Ilaenia (Haan), Simo- 
