WORMS, ETC. 507 



superiors corporis facie ; capite longiori, fronte mediocriter 

 excisa, oculis in unam seriem dispositis. Halimede, nov. 

 gen., with the single species, H. venusta, is distinguished 

 from Hesione by the following diagnosis : proboscis sub- 

 globosa, crassa, orificio sub-quadrangulari, tentaculis non- 

 nullis prsedita ; maxillae nullae ; antennae 4 parvse ; externae 

 interraediis paulo majores ; cirrorum tentacularium paria 6 ; 

 cirri superiores praelougi filiformes ; pedes indivisi, brauchiis 

 tribus parvis praediti. Ephesia, nov. gen, with the species, 

 E. gracilis, differs from Goniada in the following : maxillae, 

 oculi, tentaculi, et cirri tentaculares desunt ; proboscis longa, 

 clavata, Isevis ; corpus elongatum, utroque latere eminentiis 

 mammaeformibus, et fasciculis setarum brevissirnarum in 

 unam seriem dispositarum. Besides these there are also 

 new Nephtys ciliata : proboscide cirris conoideis brevi- 

 oribus in 5 series transversas dispositis ; extremitatum ramo 

 superiorc carente. GJycera alba : antennis 4 extremita- 

 tibus branchia una falciformi, cirro superiore minori, cirroque 

 inferiori multo majori, complanato, triangular! fere, in- 

 structis. Aricia MuUcri : duobus minutissimarum setarum 

 fasciculis in utraque 1 7 anteriorum segmentorum latere ; 

 eminentia lamelliformi pone inferiores illos fasciculos aut 

 indivisa, aut semel incisa. Arenicola Boecfcii : corpore gra- 

 cile, extrema versus pedetentim attenuate ; branchiarum 

 paribus 40. Bordering upon Arenicola is the new genus, 

 Scalibregma, with the species, Sc. inflatum : corpus molle, 

 longum, annulatum, subcylindricum ; setarum fasciculi 4, in 

 omnibus fere corporis segmentis ; branchiae in anteriore 

 corporis parte, pone totidem setarum fasciculos dorsales, 

 fruticosae; eminentiae setiferae in posteriore corporis dimidiA, 

 parte pediformes, complanatae, in duos ramos divisae ; an- 

 tennae, maxillae, oculi nulli ; proboscis sine eminentiis ver- 

 rucaeformibus. Ammotrypane: corpus elasticum, prolongation, 

 annulatum, glabrum ; branchiae simplices, cirriformes, in 

 duos series ad corporis latera dispositae ; setae omnes tenues, 

 simplices ad corporis latera; caput ante diminutum et acute 

 terminatum ; os in inferiore capitis facie, nudum, transver- 



