119 
. THIA. 
Tura, Leach. 
CHARACTER GENERICUS. 
Testa subcircularis posticé truncata; orbita integra; oculi 
minimi vix prominuli; antenne exteriores corpore lon- 
giores utrinque ciliate ; segmento tertio ex articulis 
elongatis cylindricis effectis ; pedipalpi gemini externi 
cauli interno biarticulato ; articulo secundo primo multd 
breviore, ad apicem internum truncato-subemarginato. 
Pedes decem ; par anticum majus, equale, didactylum ; di- 
gitis deflexis ; paria alia tarsis tibiis dupld brevioribus ; 
unguibus acutis, flexuosis longitudinaliter sulcatis. 
Abdomen Maris 5-articulatum, articulo primo transverso, 
arcuato, lineari; secundo paululum longiore anticé ar- 
cuato-subproducto ; tertio valdé elongato apicem versus 
paululum angustiore, apice subemarginato ; quarto sub- 
quadrato, apice subemarginato ; quinto triangulari. 
THIA. 
GENERIC CHARACTER. 
Shell subcircular, truncate behind ; orlit entire; eyes very 
small, scarcely prominent ; external antenne longer than 
the body, on each side ciliated; third segment com- 
posed of elongate, cylindric joints ; external double palpes 
with their internal footstalk biarticulate; the second 
joint much shorter than the first, its internal apex trun- 
cate-subemarginate. 
Legs ten; anterior pair largest, didactyle, equal in size, 
with its fingers deflexed ; other Jegs with their tarsi half 
the length of the tibia; claws sharp, flexuose, longitu- 
dinally sulcated. 
