Plate 46. Supplementary. 



TONGUES OF THE DORIDIDiE AND TRITONIADjE. 



The figures represent a single row of spines in each tongue ; or, in the broad tongues, 

 half, or such other portion of a row as is necessary to show the varying character of the 

 spines. Our space would not allow us to figure all the tongues of which we have made 

 drawings : we have, however, given the more striking and typical forms, and descriptions of 

 the others will be inserted, with a comparative reference to those that are figured. Of the 

 species omitted in the descriptions the tongues have not been examined. 



The number of rows of spines increases with age, so that the numbers given in the 

 descriptions can, in most cases, only be considered as an approximation. Care has been 

 taken, however, where it was possible, to make the calculation from full-grown specimens. 



Fam. DORIDIDiE. 



Sub-Fam. Doridince. 

 * Tongue broad. 



Doris tuberculata. Lateral spines numerous, 70 to 72 on each side, decreasing towards the centre, 



stout, smooth, strongly hooked. No central spine. 40 to 43 rows. 72*0-72. Fig. 1 ; and 



Fam. 1, PL 1, figs. 6, 7, 8, 9. 

 D. flammea. Lateral spines 35 or 36 on each side, similar in form to the last. No central spine. 



25 rows. 36-0-36. 

 D. Zetlandica. Lateral spines numerous, long and slender, subclavate, minutely denticulated on the 



inner margin; decreasing abruptly towards the centre. No central spine. (The exact 



number of rows, or of spines in a row, could not be made out.) Fig. 2. a, a spine enlarged ; 



b, portion of the same more enlarged. 

 D. millegrana. Lateral spines about 50 on each side, gradually decreasing towards the centre, stout, 



smooth, strongly hooked ; 5 or 6 of the extreme laterals small, slightly bifid, and minutely 



denticulated. No central spine. About 32 rows ; dark amber-coloured. 50-0-50. Fig. 3. 

 D. Johnstoni. Lateral spines about 25 on each side, stoutish, hooked, smooth; 5 of the extreme 



laterals slender, diminishing outwards, set at a different angle from the others. No central 



spine. 24 rows; pale straw coloured. 25-0-25. Fig. 4. 

 D. planaia. Lateral spines about 30 on each side, long, stoutish, slightly hooked, smooth, diminishing 



gradually towards the centre; 9 or 10 of the extreme laterals smaller, very slender, arched, 



diminishing outwards. No central spine. (Number of rows not made out.) Colour pale 



yellowish-brown. 30-0-30. Fig. 5. 



