320 



MR. CYRIL CROSSLAND OX THE 



[Feb. 16, 



nearly colourless but for the red gills and blood-vessels and, 

 posteriorly, the gut. Others, including specimens from Wasin 

 Harbour, of nearly the same size, were of a light brown colour 

 anteriorly, somewhat darker in the intersegmental grooves, but 

 nearly all the preserved specimens are now practically colourless. 

 One specinren shows mottling of brown pigment anteriorly as far 

 back as the middle of the gill-region. 



The prostomium is normally somewhat conical in shape, with a 

 veiy small notch in its anterior border, though it is deeply grooved 

 below (PI. XXI. figs. 9 & 10 and text-fig. 62, b). In two out of the 

 ten large African specimens specially examined it was, however, 

 as bi'oad distally as at its base, and in two others, as in one of the 



Text-fio-, 62. 



Heads of three sjiecimens of JS. indica, two of which (a and c) are of 

 abnormal shape. 



The figure shows also variations in the peristomium and in the thickness of 

 the tentacles. 



small Maldivan examples, its margin was quite entire. Compai'e 

 the drawings in text-fig. 62, The eyes are large and of the form 

 of a rounded triangle. The tentacles in all examples are quite 

 smooth, without trace of ringing. The smooth tentacular cii-ri are 

 i-emarkably long, extending usu.ally beyond the anterior border 

 of the buccal segment, and in some cases even to the front of the 

 prostomium. These proportions are shown in text-fig. 62 and in 

 PI. XXI. fig. 9. 



The jaw-apparatus is chai'actei-ised by the small size, delicacy 

 and calcareous composition of its plates, and by the asymmetry of 

 the gi'eat dentals. As in U. aniennata, E. vittata, and certain 



