carnosum, flavo - fuscum , latcraliler lineolis nigris variegalum, roslro porreclo, acu- 

 to, brevi, maxillis lulvo-corneis , subsinuose marginalis, subaduncis, cirrliis infra 

 menlum quatuor, pone aliis duobus; collum subdislinclum, breve , nudum, sublus 

 flavicans. Testa ovato-globosa, supra nigro-fusca, sublus flavicans, anlice sub- 

 anguslior, obliqua , apice truncata, sinuosa, poslice convexa, subacutior, rolundato- 

 marginata, versus dorsum inedium obsolete tricarinata , planiuscula; scuta dorsi non 

 slriata , obsoleta, spinalia obscui'e subtricarinata , convexo - planiuscula , quinc^ue, 

 quorum prinmm pentagonum, antice alatum, sinuoso -marginatum , postice rectan- 

 gulare, suboblic^uum , niedio obtuse angulatuin , secundum et terlium oblonga, oct- 

 angula, planiuscula, postice subtenuia, antice et postice angulate emarginata, medio 

 obtuse canaliculata , quartum svibbexagonum , convexum, antice et postice lenuius, 

 antice trispinosum, quintum triangulum, convexum, apice obtuse acutum, subverticale, 

 medio canaliculatum , lateralia disci obliqua, convexa, quatuor, quorum anticum 

 primum triangulum, largum , extus dilatatum , media subrectangula, oblonga, versus 

 dorstun introrsvim angulate reflexum , posticum minus, subpentagonum, pone angu- 

 late subacutum, marginalia dorsi brevia, subrugosa, rotundato-marginala, viginti 

 quinque, quorum primum impar brevissimum, vix conspicuum, subplanum, secun- 

 dum minus, quadrilaterale, tenue, intus angustius, subobliquum , terlium et sex- 

 tum subrectangula , oblonga , media verticalia , rotundato-marginala, cataphracla, 

 subtus flava, posteriora paulo largiora, obliqua, subquadrata , non excavata, margi- 

 ne rotundo. P ec tus ocbraceo-flavicans , varie sinuoso-subsulcatum, oblongum, an- 

 lice et postice rotundato-marginatum , postice medio obtuse emarginatum, lobo an- 

 terlore et posteriore membranoso-articulatis ac flexibilibus; bracteae undecim, qua- 

 rum antlca impar rotunda, larga, antice subtruncata, nigro-exsculpta, sccunda utrin- 

 que rbomboidea, intus subacvita , tertia triangula , intus acuminatissima, medio ni- 

 ero-sulcata, quarta quadrata, magna, laevis , quinta trapezoidea , intus attenuata, 

 nigro-sulcata, postica subtriangula vel trapezoidea, antice et postice tenuior, poslice 

 apice obtuse emarginata, a testae margine remota; bracteae pectoris medii laterales 

 duae, suturis separatae; pedes palmati, supi-a vii-idi-fusci, membranosi, infi-a flavi- 

 cantes, intus transverse bisquamosi; ungues breves, compressi, anteriores falcifor- 

 mes fusci; cauda brevissima, e testa vix exserta, rugosa, pone anum tenuior, sul- 

 cata, apice acuta, breviter unguiculata. Longitudo corporis 7' 3", capitis i'g", 

 testae 5'9"> caudae 4", sterni 4'; latitudo testae 2-^', capitis i'; altitudo testae li'. 



Habitat ad ripam fluminis Solimoens. 



3* 



