17 175 



Doridiidae. 



DoridiUin, Meckel. 



Doridium lineolatum (II. & A. Adams). 



Aglaia lineolata, H. et A. Adams. The genera of recent moll. II. 1 S58. p. 27. III. PI. .08, fig. 4. 



PI. II, Fig. 12. 



The here examined form seems to be identical with the one figured (originally) by 

 Adams, which was taken «von Gould in Australien». To these words and a figure is con- 

 fined what is hitherto known of the animal. 



The only (soft) specimen kept in spirit, was taken by Dr. Mortensen on the 6"' of 

 Febr. 1900 to the north of Koh Kam at a depth of 5 fathoms on sandy bottom. 

 The length is now 6 mm , by a breadth of 4 mm , and a height of 3.2 mm . — The back (fig. 12) 

 was covered with not quite narrow, brownish gray transverse lines, sometimes dividing and 

 anastomosing, and alternating with similar whitish ones; the outside of the foot-lobes 

 showed similar gray transverse lines, only a little lighter, and still lighter were those on 

 the sole of the foot. The fore-end of the head was whitish, but the edge black, which 

 latter colour was also found on the lower side of the hinder wings. The sides of the 

 body were whitish, dotted with brownish gray, and the upper side of the foot had the 

 same colour. The gill, the vulva, and the seminal furrow on the contrary were white. 



The form was the one common in the Doridiidae. .The fore shield was somewhat 

 longer and a little narrower than the hinder shield ; the not thin lateral edges somewhat 

 loosened, the hinder one a little more; eyes were scarcely to be seen. The hinder shield 

 was posteriorly broader, its lateral margins, especially the right one, more conspicuous; 

 the shield passes posteriorly in the median line into the lower side of the body proper, and 

 either of its lateral parts forms a wing-like lobe downwards projecting, with the point 

 turned somewhat inwardly, and somewhat concave on the inside ; the right lobe was some- 

 what larger than the left one. The shields were quite even. The sides of the body were 

 as usual; the gill-cavity which was overhung by the hinder shield, was as usual, and so 

 was also the large gill that was turned downward. The foot was as usual ; its even lobes 

 running along its whole length, were rather thick, not high; the whole hinder part of the 

 body rests on the large, broad, freely projecting tail. 



The shell, as far as it might be judged, was of the common form, the right end 

 of the large winding projected rather far into the right dorsal lobe; the shell seemed to 

 be calcinated to a great extent, and was very fragile. 



The intestines were nowhere to be seen from without. 



The central nervous system that encompassed the fore end of the bulbus pharyn- 



