18 AET. II. — A. IZUKA : 



with lateral prominences lies nearer to the posterior than to the 

 anterior border ; and on these lateral prominences arc situated the 

 larger anterior eyes. Posterior eyes of about half the diameter of 

 the anterior, situated on the postero-lateral border of prostomium ; 

 invisible from above, being covered over by nuchal fold. Both pairs 

 of eyes somewhat elliptical and black. 



Ceratophore of median tentacle much larger than lateral 

 tentacular ceratophores, which are prolongations of the prostomium. 

 Style of median tentacle twice as long as those of lateral tentacles, 

 gradually tapering from the broad base to the small subterminal 

 bulb, after which it again tapers to form the short terminal fila- 

 ment. Style of lateral tentacles similarly built as that of the 

 median, but shorter. All the tentacles are smooth ; their colour 

 nearly white with a reddish brown ring around the base of style, 

 and also around the proximal region of the subterminal enlargement. 

 Subtentacles stout, their tip extending a short distance beyond that 

 of the terminal filament of lateral tentacles, gradually tapering from 

 base to tip ; the entire organ nearly white. Tentacular cirri simi- 

 lar in form and colour to those of lateral tentacles, but with 

 longer style. 



There are 26 segments to the body, which is smooth on both 

 dorsal and ventral surfaces. Neural depression well marked, slight- 

 ly wider in about the anterior J of its length than in the posterior 

 parts. Nephridial papillae commence from the 9th segment and 

 continue to exist posteriorly to the 24th segment ; the first one is 

 very small. 



Elytra in 12 pairs, borne on segments 2, 4, 5, 7, 9, 11, 13, 15, 

 17, 10, 21 and 23. They are rather small, leaving a median longi- 

 tudinal portion of the back exposed, thin and semi-transparent, 

 generally oval (fig. 12), with the attachment indicated by a brown- 



