40 



maxima dorsalia et 2 multo minora labialia ad margines laterales veil lati antice truncati 

 posita. Maxillae corneae in proboscide conica exserta valvulas Limae referentes, antice supeme 

 auricula triangulari ornatae, processu infero uullo. Lingua subcuneiformis radula seriebus trans- 

 versis dentium circiter 20 Isevium dente medio conico retroflexo utrinque lateral! recto acu- 

 minato. Papillae dorsales simplices. conicae, breves, utrinque ad latera dorsi et ad marginem 

 pallialem disperse. Pes ovato-elongatus, latiusculus, angulis anterioribus rotundatis, pallio 

 major. Orificia generationis et ani ad latus dextrum. 



Goiiieolis-typica. M. Sars. 



Corpus triple circiter longius quam latius, altitudine maxima in parte antica sita lati- 

 tudinem aequante, capite antice valde declivi. Tentacula dorsalia latitudinem corporis aequantia 

 postice cornuum instar curvata minime lamellata; labialia tenuissima fere filiformia lateribus 

 corporis appressa. Papillae dorsales minimae, inaequales, sparsa. Pes amplus postice conico- 

 rotundatus. Color albido flavescens subpellucidus. Longit. 12 Mm. latit. max 5 Mm. Ha- 

 bitat rarissima ad Christiansund prof. 5070 orgyarum, nee non in sinu Hardangerfjord prof. 

 100 orgyarum fundo argillaceo. 



The Genus Gonieolis belongs to the family Eolididae Alder & Hancock, but is not 

 properly referable to any of the sub-families formed under this head. It cannot be classed 

 with the Dendronotinae the tentacles of which are lamellated and retractile into sheaths; nor 

 yet to the Melibaeinae, which have tentacle-sheaths and claviform dorsal papillae; neither can 

 it be referred to the Hermaeinae and Proctonotinae, which have a dorsal anus. The sub-family 

 with which it best agrees is that of the Eolidinae, where however there is not to be found 

 any trace of the mantle, so distinctly marked in the Gonieolis, although not projecting much 

 beyond the sides of the body, and without spiculae, which are found in the mantle of the 

 family Dorididae. Among the Eolididae it has most resemblance with the proper genus Eolis 

 Cuv. but differs by the presence of a mantle-border, which gives the body a square form, 

 (while the Eolis has a round back), by its unusually large dorsal tentacles, as well as by the 

 labial tentacles springing from the sides of a broad velum, points that are not to be observed 

 in any other species of Eolis with which I am acquainted. It ought therefore certainly to be 

 placed nearest to the Eolis, and the characters for the sub-family Eolidinae should be some- 

 what modified in order to admit it. 



