668 CLASS X. 
Compare Lracu On the characters of the genus Thalassina of LATREILLE, 
Zool. Misc. 111. 1817, pp. 27, 28. 
+ Accessory branchial appendages cylindrical, dichotomous, adhering to 
the abdominal feet. 
Callinidea Enw. 
Callinisea Epw., Zsea GUERIN. 
Compare GUERIN Description d’un nouveau gemre de crustace macrowre. 
Ann. de la Soc. entom. de France, 1. 1832, pp. 295—300. 
+ + External branchice none. 
a) Four anterior feet didactylous. 
Thalassina Larr. (in part), Leacn, Aaius Leacu, Callianassa 
LEACH. 
Sp. Thalassina scorpionides, Cancer anomalus HerBst, LEacH Zool. Mise. 
Tab. 130, Dresmar. Crust. Pl. 35, fig. 1, GuéRIN Jconogr., Crust. Pl. 18, 
fig. 4; from the coast of Chili ;—Callianassa subterranea LEacH, DESMAR. 
Crust, Pl. 36, fig. 2, GuERIN Iconogr., Crust. Pl. 19, fig. 4, on some parts 
of the English coast and in the Mediterranean. According to EpwaRps 
Callian. laticauda Orro, Nov. Act. Acad. Ces. Leop. Car. Tom. XIv. 
Tab. 21, fig. 3, is not specifically different from it. 
b) Two anterior feet alone didactylous. 
Genera: Gebia Leacu and Glaucothoé Epw. (Prophylax Latr.?) 
Note-—Genus Megalopa Lracu, Megalops Evw., placed here by 
LatTREILLE between Galathea and the preceding genera, must be 
suppressed ; from the observations of THompson and RatTHKE it 
belongs to the earlier forms of brachyurous Decapods. The same 
conclusion is to be formed respecting JJonolepis Sav. 
TuHompson Phil. Trans. 1835, pp. 358—362, Pl. v.; RaTHKE Beitr. z. 
Vergl. Anat. 1842, p. 46. : 
Galathea Fasr. Middle antenne short, geniculate, terminated 
at the apex by two sete; external long, with elongate, multiarticu- 
late seta, without a scale at the base. First pair of feet large, 
chelate; fifth pair of feet slender, recurved. Shell ovate, depressed. 
Galathea and Grimothea LEACH. 
Sp. Galathea strigosa FaBR., Cancer strigosus L., DisM. Crust. Pl. 33, fig. 1, 
Gusrin Iconogr., Crust. Pl. 17, fig. 3. 
