122 Scientific Intelligence. 
parva instruct. Abdomen sat breve vel mediocre. Branchice sepius 
penicillate. Pedes 2 antici oblique projecti; 6 postici directione con- 
similes. 
1, Antenne extern squamd basali non instructe. Pedes antici non chelati. 
Fam. 1. Scyittartpz.—Carapax valde depressus, marginibus lateral- 
a sat tenuibus, carapace lateraliter subito inflexo. Antenne ex- 
terne laminate, breves. ternum trigonum.—GeEneERA: Scyllarus, 
Fabr., Arctus, D., Thenus, Leach, Parribacu s, D. Ibacus, Leach. 
Fam. 2. Patinurip#.—Carapax eiboylindridis, lateraliter tate rotun- 
datus. Antennz extern basi subcylindricz, longe. Ste m tri 
gonum, —GENERA: Palinurus, Fabr., Panulirus, Gray. 
2. Antenne externe squamd basali instructe. Pedes antici didactyli. 
. Eryvontp£.—Carapax non oblongus, ee lateribus su- 
on inxs abdomine multo augustiore.—-Genu Eryon, Desm. 
m. 4. Astacip#.—Carapax oblongus, sabeylind ricus, abdomine 
rece ninbatiore: Sternum angustum.--Genera: Homarus, Edw., 
Astacoides, Guerin, (subgen. incl. Avert. a Cheraps, Er ich.) 
Astacus (subgen. incl. Astacus et Cambarus, Erich.) Nephrops, 
Leach, Paranephrops, White 
Subtribus III. CARIDEA vel MACROURA TYPICA. 
Carapax sutura transversé non notatus, cephalothoracem plerumque 
tegens, lateribus anterioribus liberis, epistomate non connatis. Antenn® 
externe squama basali grandi instructe. Corpus sive subcylindricum 
sive paulo compressum. Branchire seepius foliose. 
Fam. 1. Cranconipz.—Mandibul graciles, valde incurvate, non pal- 
pigeré, corona angusta. Pedum pares Imi 2di inter se valde ineequi. 
Subfam. 1. Cranconinz.—Pedes Imi 2dis crassiores. Maxil- 
lipedes externi pediformes. Digitus mobilis in palmam clau- 
dens, immobilis spiniformis. Pedes 2di non annulati._-GENERA? 
Crangon, Fabr., Sabinea, Sime Argis, Kroyer, Paracrangon, D- 
Subfam. 2. Lysmatin=.—Pe mi 2dis crassiores. Maxillipedes 
» GNATHOPHYLLI 
i cades externi ian operculiformes.—Genus : Gnathophyllum. 
Fam, 2. Aryip#.—Mandibule crassze, non palpigere, corona lata, parce 
bipartita, processu terminali brevi et dilatato. Pedum pares 
ique inter se os carpo nunquam annulato, 
Subfam. 1. Ary ~Podes teeasia palpo non instructi.—G=N" 
ERA: Atya, heeehs Atyoida, Randall, Caridina, Edw. 
_ Subfam. 2. Ernvnwws.—Pedes thoraciei A pelts inst. 
Ephyra, Roux, DeH. — = 
