3« 



MI ABRANCHIATE GASTEROPODA. 



forward; in front the strong conical tentacle (fig. 6a) projects on either side; behind the rather close 

 set, longer, and more powerful rhinophores, likewise conical (fig. 6b); in front the roundish onter 

 month. The back is broad, its last fourth part highly decreasing in breadth, almost flat, smooth; its 

 lateral parts rising only a little over the sides of the body. The papilligerons lateral parts are rather 

 narrow, in front almost stretching to the base of the tentacles (fig. 6c— a), behind almost meeting at 

 the base of the tail. The papilla; were densely crowded without being distinctly placed in oblique 

 series, those series perhaps containing 6 — 8 papillae 1 ). The size of the papillae is upon the whole as 

 in other Aeolidiadae, decreasing outwardly; the remaining papillae were uncommonly small, conical, 

 and did not fall off quite easily. The sides of the body were not quite low. In the region under 

 the right rhinophore a rather long and rather strongly projecting fold was seen running towards the 

 anus; the fore end (praeputium penis) of this fold projected 5 mm in a lobelike manner, and behind and 

 parth - covered by this fold the genital aperture was seen (fig. 6). Farther back, about at the middle 

 of the side of the body the anal papilla was found directed a little upward, and before it the little 

 renal papilla (fig. 6d). The foot is powerful, the rounded fore end with a deep marginal furrow (fig. 6), 

 and mediauly emarginate upper lip; the foot-brim not narrow; the tail flat, lanceolate, rather short. 



At the uppermost part of the sides of the body towards the dorsal edge the liver shone through 

 as quite small, slightly yellowish white grains; similar grains, but more powerful (for a great part 

 with mark from fallen-off papillae) were seen on the lateral parts of the back towards the papillae. 



The central nervous system showed almost the same structure as was seen by the 

 preceding examination 2 ) of the typical species; especially on account of the contractility of the 

 enclosing loose capsula, the absolute and relative form and size of the different ganglia vary not a 

 little in the Nudibranchiata. The boundary between the cerebral ganglia and the pleural ones (fig. 8 a) 

 was rather distinctly marked, and the pedal ganglia (fig. 8b) a little larger than the cerebro-pleural 

 ones. The strong ganglia rhinophorialia (olfactoria) (fig. 8c) were rather short-stalked; the buccal 

 ganglia and the gastro-oesophagal ones (fig. 8d) were as before described. The pedal commissure 

 was a double one, before it the much thinner pleural one was seen, and in front a subcerebral com- 

 missure. 



The otocysts as earlier described. I succeeded also in this individual in finding eyes (fig. 8); 

 they were almost sessile, of a diameter of about cri6 mm , with a black pigment and a yellowish lens. 



The buccal tube is short. The bulbus pharyngeus very strong, shorts), 8 mm broad by a 

 length of 6 mm , and a height of 6 mm , the radula sheath not projecting or indicated on the hinder end. 

 The mandibles were as long and high as the bulb, light amber coloured, only the crista counectiva 

 and the masticatory edge yellowish brown (fig. g); in front on the outside was seen a short, strongly 

 projecting, broad keel (fig. io); the masticatory edge rather broad ( — o-oio" 1 " 1 ), the masticatory process 

 rather short, straight; the masticatory edge somewhat worn with many (up to about 20) irregular rows of 

 close set, little (o-oi3" m ) projecting nodules, most frequently obtuse and cleft (fig. n). The secondary 

 oral cavities rather large with a rather wide opening; their hinder wall had a slightly yellowish 



'j In the (smaller) individuals of the typical species earlier examined by me, the series appeared to contain more 

 (8—io) papillae, and the innermost of these to rise to a greater length (5-511111). 

 -•' 1. c. fig. 5. 

 ..) Comp. 1. c. Taf. Ill, fig. 7. 



