54 ASTACID^E. 



tenia dente apicali acuto erecto ; parte externa apice incurva, internam 

 tegente, dentibus duabus apicalibus comeis perparvis, coadunatis. 



Forma II. differt chela non barbata ; pedibus abdominalibus magLa 



cylindricis, basi articulatis, parte interna dente apieali extrorsuin re- 

 curvo, parte externa dentibus non fusco comeis, majoribus, distantibus. 



Femina differt ehelis minoribus ; ventre inter pedes quartos lasvi, 

 anuulo majori, ovali, sulco longitudinali, alternatim fisso. 



Long. 1.8 ; antenn. 1.3 ; ped. ant. 1.2. 



Habitat : Georgia ; Charleston, South Carolina. 



Animal paulo villosum. Vidi juniores rostro acutiori. ante apicem 

 ntrinqne dente acuto, pedibus maris abdominalibus dentibus magis ex- 

 pressis. 



The description of C penicillatus LeConte differs somewhat. The 

 words, " Thorax lateribus granulatis," "brachio punctato, spinoso, tuber- 

 culato," do not answer very well to the single male, Forma I., which I 

 have seen. But I think the species the same. The tuft of hairs along 

 the inner margin of the hand is very striking. 



(^it. No. 250, Charleston, S. C, L. Agassiz. Male, female, young. 

 Spec. 8. 



Cat. Xo. 254, Charleston, S. C, Professor Baird. Male Form I. Fern. 

 Spec. 2. 



Cat. No. 279, Georgia, Dr. Jones. Male, young. Spec. 1. 



12. Cambarus "Wiegm.vn'xi Erichson. 



Astacus Wiegmanni Erichson, Wiegm. Arch., T. 12, p. 99, n. 19. 



Figures on PI. III. 

 Antcnual lamina, fig. 151, a; cpistoma, b; spine of the second joint of the exterior antenna, c. 



Fem. Rostro lato, modice longo, articulum antennarmn secundum 

 vix superanti, piano, punctato. antice sensim angustiori, acumine subito 

 ac breviter triangulari, latitudine fere dimidio breviori ; marginibus 

 usque ad apicem elevatis ; cretis modice elevatis, postice divergentibus, 

 extus obsolete lineato-impressis, antice muticis. Antennis validioribus, 

 corpore breviorilnis ; articulis basalibus dente parvo externo ; antennis 

 internis dente infero medio acuto ; lamina brevi, antice latissima. mar- 

 gine externo inflato. spina apicali brevi, acuta. Epistomate brevi. lato, 

 antice triangulari, acutiori ; pedibus maxillaribus intus dense, subtus 

 minus barbatis. Thorace elongate ovato. ubique punctato, lateribus 

 mesothoracis granulosis ; linea modica profunda, subsinuata, lateribus 

 divisa, apiee mutica ; areola punctata, angusta, postice subito latiori. 

 Postabdomine thoracis longitudine, basi thorace latiori, subcompresso, 

 la?vi, postice angustiori; segmentis anteapicalibus angulis externis ob* 

 tusis, subrotundatis ; lamina media parte basali apice utrinque bispina 



