352 NOTES ON SO.MK BIJITISH NUDIBHANGHft. 



dorsal margin starts from the rliinopliore sheath ; it makes four not 

 very distinct undulations and bears about twenty-two papillie, most of 

 which, especially the taller ones, are carried vertically, though some of 

 the smaller ones point sidewards. The taller papilUe bear a distinct 

 bull) under the pointed tip, but in the smaller ones the bulb is less 

 developed. Four of the papilku are distinctly larger than the rest and, 

 roughly speaking, mark the divisions between the undulations. The 

 third of these larger papilhe is the tallest of all and is about 2 mm. 

 higii (Fig. 9. c). 



Another specimen (B), which was about 7 mm. long when at rest and 

 8 mm. when crawling, was brownish white, with yellowish-brown mott- 

 lings down the centre of the back and deep purplish-brown mottlings 

 on the cerata. The other external characters arc much as in the 

 specimens already described, but the papillae are not so long and there 

 are only obscure indications of the subterminal bulb. The dorsal 

 margin is more clearly a web connecting the papilla;. The rhinophore 

 sheaths bear five processes each. 



Three other specimens of about the same size were so macerated that 

 nothing could be done with them except to examine the buccal parts. 



The jaws and radula are much the same in all eight specimens. The 

 jaws are not denticulate, but near the edge is a mosaic formed of tile- 

 like prominences denticulate on the anterior edge. The radula is very 

 irregular in appearance and could not be laid out straight in any 

 specimen. There is a wide naked rhachis bearing folds, and on each 

 side of the rhachis fifteen to twenty rows of teeth, each containing 

 eight to ten teeth on either side. More could not be made out with 

 certainty. The teeth are longer than in Alder and Hancock's and 

 Bergh's plates, and more uniform. They are dagger- shaped, but slightly 

 bent at the end, bearing at least twelve denticles on either side and 

 perhaps considerably more, but the denticles are hard to see, even with 

 a high power. The innermost are slightly shorter and stouter; the 

 outermost longer and thinner. 



The animals are very delicate. They die in captivity without 

 apparent cause, and the body becomes decayed and macerated very 

 rapidly. 



This form, especially the specimen called B, approaches the L. mar- 

 vioratus of Alder and Hancock sutticiently nearly to bear the name. 

 Their plate {Eumenis marmorata, Fam. 3, pi, 1. a.) contains one of the 

 few inaccuracies to be found in their works, inasmuch as it represents 

 the dorsal margin as continuous with the oral veil, not as starting from 

 the rhinophores. But in a preliminary study for the drawing preserved 

 in a bound volume of Alder's drawings, belonging to the Hancock 

 Museum at Newcustle-on-Tyne, the disposition of the parts i.s somewhat 



