ffom the Proceedings of the Acacleiay of Natural Sciences, June, 1857. 



Prodromas descriptionis animalinm evertebratorum, quse in Expeditione ad 

 Oceammm Facificum Septeutrionalem, a Bepublica Federata missa, Cadwala- 

 daro Binggold et Johanne Bodgers Ducibus, observaTit et descripsit 



W. STIMPSON. 

 Paes. II. TURBELLARIEORUM NEMERTINEORUM 



GENEEITM ET SPECIERUM ADHDC INEDITAKUM DESCRIPTIONES ; 

 ADJTINCTIS NOTIS DB GENEEIBUS JAM CONSTITUTIS. 



Characteres, ex quibus generum distinctiones pendent in hoc tribu, sunt : 

 corporis forma, longissima v. brevior et lata, plana v. teretiuscula ; forma capi- 

 tis discreti v. continui ; positio proboscidis aperturse, (os, Quatref.,) terminalis 

 V. subterminalis ; et prsesentia aut absentia aperturse ventralis, (os, Grube; aper- 

 tura genitalis, Quatref.) lobarum, plicarum frontalium, fissurarum lateralium, 

 et ocellorum. Aperturam parvulam (anum v. ap. genitalem) apud extremitatem 

 corporis posteriorem describunt auctores, quam nunquam invenire potui in 

 speciebus quas observavi. 



Genera adhuc proposita sunt : 

 LiNEUS, Sowerby, 1804. 



TuBULANus, Renier, 1807. 



Ceeebeatulus, Renier, 1807. 



Nemertes, Cuvier, 1817. = Linbus. 



Borlasia, Oken, 1817. = Lineus. 



LoBiLABRUM, Blaiuville, 182-. 



Folia, Delle Chiaje, 1823. Prseoc. — Polia, Ochsenheim, Ins. 1816. 



Ophiocephalus, belle Chiaje, 1823. 



Meckelia, Leuckart, 1828. = Cerebratulus. 



NoTOSPERMUS, Huschke, 1830. 



MiCRURA, Hemprich et Ehrenb., 1831. 



Tktrastkmma, Hemp. etEhrenb., 1831. 



Omatoplea, Hemp. et Ehrenb., 1831. 



Hbmictclia, Hemp. et Ehrenb., 1831. 



Polystemma, Hemp. et Ehrenb., 1831. 



Amphiporus, Hemp. et Ehrenb., 1831. 



Notogymnus, Hemp. et Ehrenb., 1831. = Notospermus. 



Tricelis, Hemp. et Ehrenb., 1831.= Notospermus. 



Carinella, Johnston, 1833 ; fide ejusd. = 3Ieckelia. (CEBSBRATnLDS.) 



Acrosiomum, Grube, 1840. (v. Acrostoma, Le Sauv., Verm., 1826.) 



Rhamphogordius, Rathke, 1843. 



Cephalotrix, Oersted, 1844. 



BoRLASiA, Oersted, 1844. 



Nbmertes, Oersted, 1844. 



Amphiporus, Oersted, 1844. (non Ehrenb.) 



Astemma, Oersted, 1844. 



Sbrpentaeia, Goodsir, 1845. 



Valencinia, Quatref., 1846. 



