76 PROCEEDINGS OF THE ACADEMY OF [1879. 



cover the back entirely. The number of rows was about twenty- 

 five to thirty-two, the foremost shorter, with about seven to nine 

 papillre;. the hindmost the shortest, with about three to four 

 papillae, the rest longer and much more oblique, with about twelve 

 to thirteen papillae. The papillae flattened, quite as in other true 

 Aeolidise. The anus is between the outer part of two rows behind 

 the middle of the back (at about the thirteenth or fifteenth row). 

 The intestines were seen very distinctly shining through the wall 

 of the back. 



The cerebro-visceral ganglia were somewhat elongated, reniform, 

 thinner and broader in the fore part, thicker in the hindest part; 

 the pedal ones rounded, triangular, as thick as the confining part 

 of the visceral ganglia. The buccal ganglia were about one- 

 quarter of the size of the pedal ones ; the gastro-oesophageal 

 ganglia rounded, about one-quarter of the size of the buccal ones, 

 with three large cells. 



The eye was furnished with black pigment and yellow lens. 

 The otocysts could not be found. 



The buccal tube short, rather wide, with strong longitudinal 

 folds on the inside. The bulbus pharyngeus rather short, some- 

 what compressed ; in length about 3.5 mm. by a height of 2.75, 

 and a breadth of about 2.0 mm. The form-relations for the rest 

 quite as in the Aeolidia serotina (cf. 1. c). The mandibles (fig. 1) 

 were very strong, flattened, yellowish, or brownish-yellow ; the 

 articulation strongly developed, on the anterior outer side some- 

 what twisted, slightly bilobed ; the keel on the inside (crista con- 

 nectiva) short, somewhat prominent (fig. la); the cutting blades 

 (processus masticatorius) rather prominent (fig. 16), the margin 

 with very fine longitudinal lines (fig. 2). The tongue rather 

 short and strong (on the under side, the end, and the upper side), 

 with 13 plates, under the narrow tectum radulse and further back- 

 ward in the sheath {vagina, pulpa radulse) seven developed and 

 two immature teeth ; the total number of teeth was twenty-two. 

 The plates similar in form (fig. 3, 4) to those of the two other 

 species ; light brown-yellowish ; on each side of the nearly imper- 

 ceptible median impression and prominence in the foremost 

 plates thirteen, in the hindmost as many as seventeen lancet- 

 formed denticles ; the breadth of the foremost teeth was about 

 0.3 mm.; of the hindmost nearly 0.68 mm. 



The salivary glands were as in the typical form. 



