PLEURONECTES MANCUS. 



deprefTum, utiinque fquamatum : Squama irregulariter imbricatae, diftantes, membrana 

 fere teftas, obovatae, minutce. 



Rinus orc claufo oblique furfum fpeftans, fcmiarcuatus, aperto fubhorizontalis, orbicularis, 

 amplus. 



Maxilla tnferior vix longior ; MenW.m obtufum, fubtus tuberculatum : tuberculum obtufum, 

 compreflum, ofleum, bilineare; OJfa mobilia, valida, comprefliufcula, bafi fuperne dilatata, 

 extus convexa : «'f^f/ram membrana llbera, lacera, fubtus marginatum. Gi^/a dilatabilis ; 

 Memhrana gularii zxa-^\z, fordide grifea, rufo puntlata. 



J/«A-;7/a y5//ifr/»r apice obtufiufcula ; ([^ utrinque bina ; ^«/«-ior^j mobilia, arcuata, apice at- 

 tenuata ; pojleriora planlufcula, fubtriangularia : Jinijlrum fuperne terminatur in tubercu- 

 lum exfl;ans, conicum, acutiufculum, trilineare, membrana veftitum. 



l.ahia utriufque maxills, extus verfa, crafla, membranacea, extus maculofa : inferius latius, 

 fubtus medio tranfverfe incraflatum. 



Dentcs utriufque raaxillae biferiati, fubsequales, fubulati, acerofi, fixi, parvi : in ferie externa 

 breviores, crafliores, gingivis partim te£li. Mcmbrana gingivales ad apicem utriufque 

 maxillas, pone dentes, tranfverfce, liberse, membranacex, fufcefcentes : fuperior vix latior. 



Lingua libera, apice vix angulum oris attingens, bafi elevata, incraflata, linearis, comprefla, 

 oflea, membrana nuda, Iseviflima veftita. 



Palatum medlo fulcatum, longitudinaliter obfolete rugofum, lateribus planiufculum, lavifli- 

 mum, nudum. 



Faux rugofa : rugis longitudinallbus, papillofis, exafperata denticulis retrorfum verfis, linea- 

 ribus, minutis : inferioribus confertis : fuperioribus in duas areolas difpofitis. 



Apertura naJaUs in latere finiftro, oculis quam apici roftri dimidio fere propiores, feparatae, 

 mlnutae : pojlerior paulo major, orbicularis, tubulofa : tubulo brevi : anterior orbicularis, 

 tubulofa : tubulo antice lincari ; apertura; in latere dextro ad bafin Pinna; Dorfalis ob- 

 foletse. 



Ondi finiftri, remotl, fubovati ; anterior fupra angulum oris, apici roftri quam commifluras 

 fuperiori aperturx branchialls dimidio propior : orhita fuperne exftans, antice aculeata : 

 aculeus antrorfum verfus, linearis ; pojierior commiflurE fuperiori apertura; branchialis 

 quam apici roftri dimidio propior, anteriore paulo major : orhita inferne exftans, obfo- 

 lete ferrata. Palpchns cute communi formatx, corpori concolores, poftice ramentaceas : 

 ramentis inxqualibus, paucls : in pofteriore paulo longioribus. Iris argeutea. Pupilla 

 oblonga, nigra. 



Opcrcula Branchiarum in latere dextio plana : in fiiilftro convexiufcula, cute communi tefta, 

 diphylla ; Anteriora oflea, dura, bilaminata : lamina Jupericr ampla, apice angulato-ro- 

 tundata, medio levlter fquamofa, margine nuda : inferior oblonga, minor, bafi fuperiore 

 tedla : finiftra lcviter fquamofa : dcxtra nuda : Pojleriora fubcartllaginea, parum flexilla, 

 fquamofa, bilaminata: iamina Juperior fubovata, apice obtufe angulata : injcrior terminor, 

 teda cute communi fuperioris et inferioris anteriorum, apice rotundata. 



y^pertura 



