JAPANESE NUDIBRANCHS. 41 



The smaller specimen is contracted so as to make the sides 

 of the body seem nnnsnally high and the side lamellae relatively 

 small. But this conformation appears not to be natural. 



The edges of the jaws bear 5-6 rows of lumps. The radulse 

 of the two specimens are almost exactly the same. They contain 

 52 and 53 rows respectively and in both the formula for the 

 longest rows is 28 + 1 + 1 + 1 + 28. The median tooth bears 8- 

 11 denticulation on either side of the central cusp, The first 

 lateral bears 6-8 denticles and from 8 to 11 of the following 

 teeth are denticulate, the rest being smooth. 



These specimens agree with L. fallax Bgh. (known by a 

 single example from Enosima, Japan) in the radula and several 

 other points, but can hardly be identified with it, because it is 

 expressly said to have a smooth dorsal surface, Even in the 

 smaller specimen the back, though less markedly tuberculate than 

 in the large one, cannot be called smooth. They also show many 

 resemblances to L. variolosa Bgh. (although in all the specimens 

 of this animal hitherto described only 3-4 of the lateral teeth 

 were denticulate) and I think they should bear that name. L. 

 variolosa, as described by me in previous papers (1. a), shows 

 considerable variation in external appearance and some in the 

 radula. I am inclined to believe that it is really the same species 

 as L. fallax and that in the specimen to which Bergh gave that 

 name the dorsal tubercles had become obliterated. Unfortunately 

 the appearance of the living L. fallax is unknown. 



Pleuroleura striata van Hass. 



See Bergh, Notes from the Leyden Museum, ix, 1887, pp. 303-322; id. Die Pleuroleuriden 

 in Zool. Jahrb. Abth. für Systematik, 3. Band, Heft 3, Jena, 1888, p. 362 ; id. Siboga, 

 Opisthob. pp. 209, 210. Eliot in Stanley Gardiner's Fauna of the Maldives and Lacca- 

 dives, 1904, p. 26 ff. 



Two specimens from Misaki, much bent but 25-30 mm. long, 

 if straightened out. The dorsal stripes and other external charac- 

 ters agree with previous descriptions. The colour is yellowish 

 brown with darker spots such as are shown in van Hasselt's 

 figure. The formula of the radula is about 42x13 + 1 + 1 + 1 + 13, 



