MOLLUSCA. 67 



1. Bornella digitata. PI. XIX. Fig. 1. Born, corpore carneolo, lineis carmineis infra reticularis 

 transversim striato, appendicibus dorsalibus elongatis, bifidis aut trifidis, in apicibus conicis carmineis 

 terminatis, brancMis ab parte superiore appendicibus dorsalibus exsertis, pede albo. 



Hab. Straits of Sunda. 



This species was found adhering to floating Fuci : it crawls briskly, and when detached 

 swims by lateral inflexions of the body. 



2. Boenella Adamsii. PI. XIX. Pig. 3. Gray, Mrs. Gray's Pigures of Molluscous Animals, p. 107. 

 Born, corpore carneolo, lineis carmineis infra reticulatis transversim striato, appendicibus dorsalibus elon- 

 gatis, simplicibus aut bifidis, in apicibus carmineis terminatis, brancliiis ab parte inferiore appendicibus 

 dorsalibus exsertis, pede stramineo. 



Hab. Coast of Borneo. 



Like the preceding species, this also was found adhering to the stems of a mass of 

 floating Fuci, clinging to them by its narrow grooved foot. 



These handsome Nudibranchs, which are figured of the natural size and colour, resemble 

 Dendronotus of Alder and Hancock in their dorsal tentacles being branched at the ends, in 

 their ramifying digestive apparatus, and in their back being furnished with cylindrical 

 branching processes arranged in a single row on each side ; but the existence of distinct 

 gills, arising, as in Scyllcea, from the dorsal appendages, at once distinguishes them. They 

 seem to form a connecting; link between the Trifoniadcs and the Eolididce. 



*s 



60. SCYLLJM, LinncBus. 



1. Sctll^a Gkay^:. PI. XIX. Pig. 2. Scyl. corpore flaveolo, punctis compluribus parvis fuscis 

 et maculis majoribus fulvis, in lateribus notis ovalibus albis serie curvata ornato, linea lata turbide viridi 

 maculis viridioribus in parte inferiore, in utroque latere una nota ultramarina, tentaculis luteolis, rnar- 

 ginibus flavis et roseis, appendicibus dorsalibus liberis, extvemitatibus vivide flavo-marginatis, lateribus 

 notis parvis viridibus pictis. 



Hab. North Atlantic Ocean. 



We have dedicated this species of Scyll&a to Mrs. Gray, a lady to whom all who 

 desire to study the nature of Molluscous animals are highly indebted for having presented 

 them with outlines of the figures of this class, hitherto contained in expensive and generally 

 inaccessible works. 



61. CEKATOSOMA, n. g. 



Caput magnum, antice rotundatum, proboscide retractili, appendicibus lateralibus cylindricis, trun- 

 catis ; velum nullum. Tentacula dorsalia claviformia, non retractilia, apicibus laminatis, e tuberculis rotun- 

 datis orientia. Corpus oblongum, angustatum, postice acuminatum : appendices dorsales duas, conicse, ante- 

 riores ante aperturam branchialem, breves, rotundatse, posteriores post aperturam branchialem, elevatiores, 



