332 rUOCEEDINGS OF TUK II ALACOLOGICAI, SOCIKTY. 



light-coloured area. The rhinophores are grey with purplish spots, 

 large (4 mm. high), and have between them a large crest of the same 

 colour. Both the rhinophores and the crest are so amply and deeply 

 ])ei"foliate that the whole arrangement superficially resembles the 

 branchial rosette of a Dorid. The anal papilla is large, prominent, 

 medio-dorsal, and nearly terminal, with a crenulated edge. 



The cerata are very numerous, often flattened as preserved, but 

 apparently originally fusiform. The innermost are the largest and 

 as much as G'5mm. high. They are not set in regular rows, but in 

 a reticulate pattern which is generally 4-6 mm. deep transversely. 

 Two or three lines of small cerata extend round the head in front of 

 the rhinophores. The hepatic diverticula within the cerata are of 

 irregular shape and often conspicuously granulate or foUiculate, but 

 not bifid or branched. Some parts of tliem are much darker than 

 others and spotted with purple. 



Below the anterior mantle-edge is a small oral veil bearing two 

 distinct purple tentacles. The foot is broad, with expanded lateral 

 margins which are not, however, broader than the body. Its anterior 

 margin is bilobed and connected with the mouth, but not grooved or 

 produced into tentacular processes. The genital orifices are rather far 

 back, 6 mm. from the anterior end. The tail is very short. 



Tlie central nervous system consists of three very distinct pairs of 

 symmetrical ganglia which are all strongly granulated. The pedal 

 ganglia lie a little lower than the others at the sides of the oesophagus, 

 and are connected by a very short commissure. 



The buccal mass is very large. The jaws are long, but narrow, 

 bright yellow, but darker near the hinge and edges. There are 

 accessory pieces near the hinges. There appears to be some denticu- 

 lation on the cutting-edge, but it is not large or distinct. Possibly 

 the jaws have been injured. The radula consists of 23 rows (of 

 which three are undeveloped) of white transparent teeth. The 

 maximum formula is 37 + 1 -f 37. The central tooth is not con- 

 spicuous, and differs from the others only in its central position and in 

 being smaller. The teeth are hamate, not denticulate, and increase 

 in size outwards. Only the outermost of all is smaller. 



The stomach is rather large and laminated internally. As far as 

 could be ascertained, it receives two main hepatic ducts in front. 

 They are ramified and transparent, but speckled. The intestine 

 issues posteriorly. No armature was found on the genitalia, and the 

 verge is not very long. The mucus and albumen glands extend far 

 forward and lie under the mouth. At the sides of the back beneath 

 the cerata is a spongy layer composed of minute tubes out of which 

 rise the hepatic diverticula contained in the cerata. 



This species appears to have the characters of a typical Antiopella, 

 except that the jaws are not distinctly and strongly denticulate. It 

 diff'ers from the British A. cristata in its colour and in the size of the 

 rhinophores and crest, perhaps also in the jaws. 



For the synonymy Antiopella = Antiopa := Janus, see Eliot, 

 Notes on some British Nudibranchs, Journ. Mar. Biol. Assoc, vol. vii, 

 p. 373, 1906. 



