ELIOT : NTTDIBEANCHS FKOM THE PACIFIC. 231 



longcerata; the fifth and sixth also 14, but rather shorter; the 

 seventh and eighth 10 each, shorter still. 



The cerata are longer towards the middle, and shorter towards the 

 ends of the horse-shoe. The largest are in the second group, and 

 measure 1 1 mm. They are all cylindrical, rather thin, and contain 

 yellow liver-branches, which nearly fill the small ones, though they 

 form only a comparatively narrow centre in the larger. These 

 branches are not ramified, but are constricted here and there, and 

 have an irregular lumpy surface. The cnido-sacs at the tip of the 

 cerata ai'e paler than the rest of these organs. The genital papilla is 

 between the first and second gi'oups of cerata. 



The foot is broad, with expanded lateral margins ; the anterior 

 margin is produced into moderately long tentacular expansions, 

 grooved and bilobed in the upper lip. The mouth is a large, round 

 opening. The jaws are large, yellow, with a single row of short, 

 blunt denticles. The radula consists of a single row of 28 yellow 

 teeth, of horse-shoe shape, with a strong central cusp, and five rather 

 long and slightly curved lateral denticles, as in Bergh's plates 

 (I.e., pi. i, figs. 7-8). A few teeth have only four denticles, but 

 I did not see any which had more than five. 



This is perhaps a large specimen of H. modesta, recorded from 

 Eno - sima, Japan. But it is proportionately stouter, and with 

 longer tentacles ; also the colour in life was possibly different. On 

 the other hand, the arrangement of cerata seems the same, and the 

 teeth agree with Bergh's plates, though none have more than 

 five denticles. Perhaps a description of the colour and appearance of 

 the living animal would enable one to formulate characters justifying 

 specific rank. 



It may be doubted whether the genus Rizzolia is really distinct 

 from Hervia. The characters, as formulated by Bergh, are almost 

 identical. If the two genera are to be regarded as separate, it would 

 appear that the chief peculiarity of Ri%%olia is that the groups of 

 cerata are set on low but still quite distinct projections of the body. 



Cheomoboeis petechialis (Gould). 

 Doris petechialis, Gould : United States Exploring Expedition, 1838-42, 

 vol. xii, p. 296, Atlas, figs. 391, 391« (1852). 



One specimen obtained by Mr. Gordon Smith in the Inland Sea, 

 Japan. 



The animal, as preserved, is soft in texture, almost gelatinous ; 

 thick and stout; length 30mm., breadth 21-5, height 15. The 

 ground-colour is a semitransparent white, showing the viscera. The 

 mantle completely covers the head and foot, and is bordered with 

 orange, as is also the foot, but less distinctly. On the inside the 

 mantle-border looks as if the colouring-matter had dissolved and 

 slightly tinged the adjacent parts. On the back are scattered purplish 

 spots, not at all raised, and about 2 X 1*5 mm. in size. They are 

 thickest behind the branchiae. Similar spots are found at the sides of 

 the foot. 



The pockets of the rhinophores and branchiae are not raised. The 



VOL. VI. — MARCH, 1905. 17 



