ASTACID^. 53 



iiilbrioro scricbus lUuibus spinulaniiii. Lamella; caudalis intermedia) 

 pars anterior trispinosa. 



Long. eorp. 2.3 inch ; antonn. L3 ; elieloe, 0.5. 



Patria: Habitat emu ])riore [C. fossaruni) in fossi.s Georgia) inferioris. 



The number of the hooked legs is not mentioned, and perhaps this 

 species belongs to the group of C. affinis. The " areola suturalis angus- 

 tissima, stria solum," is a very striking character, suggesting more or 

 less agreement with C. Clarkii, C. Wicgmunni, C hmcifcr, C. obcsus, C. 

 adi'eiHi, and C. Caroliims. C. adrciia is otherwise described by LeConte ; 

 in C. Cuniliinis, C. ohcms, and C. Clarkii the hands are different; in C. 

 lancifer and C. Wiegmanni the rostrum differs. 



11. Cambarus penicillatus LcConte. 



Aslacus pcnicillalus LeConte, Proc. Acad. Philad., T. 7, p. 401. 



Fijiures on PI. I. and III. 



First abdominal legs of the male : 



first form, fig. 93 in front ; fig. 94 outside. 



second form, fig. 9 J in ti-ont ; 96 outside. 

 Antennal lamina, fig. 149, a; epistome, l>; spine of the second joint of the exterior an- 



tenna% c. 



Mas. Rostro lato, longo, piano, lajvi, apice subdeflexo, marginibus 

 ad acuminis brevis acuti apicem elevatis, convergentibus, antice subito 

 incurvis; cretis vix elevatis, subparallelis, lineato-impressis, muticis. 

 Antennis modicis corpore brevioribus ; articulis basalibus duobus dente 

 parvo externo ; antennis internis articulo basali dente infero submar- 

 ginali ; lamina brevi, lata, apice fere truncata, margine externo inflate, 

 spina apicali acuta. Epistomate brevi, lato, antice obtuse-triangulari ; 

 pedibus maxillaribus externis intus et subtus barbatis. Thorace e^lin- 

 drico, compresso, punctato, lateribus granuloso ; linea niodice profunda, 

 subsinuata, lateribus divisa, apice mutica ; areola punctata, modica, 

 postice valde dilatata. Postabdomine thoracis longitudine ac latitudine, 

 lateraliter compresso ; lamina media parte basali apice utrinque bi- 

 spina, parte apicali elliptica, vix breviori ; segmentis anteapicalibus 

 angulis externis posticis obtusis, rotundatis. Pedibus anticis modicis ; 

 chela, latiuscula, punctato-granulosa, margine interno recto, serrato, 

 longe barbato ; digitis chelie ajqualibus, rectis, costatis, punctato-ciliatis, 

 intus spongiosis, digito mobili basi extus serrato. Carpo parcepunctato, 

 longiore, extus ol^lique truncato, margine interno serrato, spina media 

 majori ; subtus Igeviori, spina antica media. Brachio Itevi, spinis ante- 

 apicalibus parvis ; subtus biseriatim spinoso. Pedibus tertiis et quartis 

 articulo tertio nnguiculato ; pedibus quartis capitulo basali conico, 

 quintis spina basali obtusa. Pedilnis abdominalibus rectis, brevibus, 

 apice contortis, subtus medio excisis, apice fere coadunatis ; parte in- 



