168 10 



almost colourless. The median plates (figs. 24, 25) were of the common form, with highly 

 spread legs, the cutting edge had 2 strong denticles on either side of the median hook. 

 Also the inner lateral plates (figs. 24 — 26) were of the common form; the first had an 

 inner and an outer denticle besides the two truncate median ones; in the following plates 

 only an outer denticle was found, and from the sixth or seventh plate (fig. 27) also this 

 denticle was wanting; in the plates of about the outer half of the series the basal plate 

 was shorter and the compressed hooks erect, rather straight, tapering; the outermost ones 

 (fig. 28 a) decreased in size. 



The salivary glands were as usual, rather long, reaching to the masticatory 

 stomach, thin, rugged, whitish. 



The hinder part of the oesophagus was developed into a first stomach. The 

 masticatory stomach formed a short, highly muscular cylinder of a diameter of 

 j-gmnij tilg length was smaller than the breadth. The stomach showed the common two 

 circles of pyramids ; they were hyaline , almost colourless with a bluish tint , of rather 

 irregular forms (fig. 29), of a height of up to O'âO™ 11 , with the common, here scarcely 

 slightly iridescent axial string. 



The penis is long, as is also the glans penis; on the inside of the praeputium, 

 as also, but more sparingly, on the glans, a not large number of rather soft cones (fig. 30) 

 distributed into a few longitudinal series, were found, reaching to a height of up to O'OB 111111 . 



For the present it must remain doubtful whether the present form is identical 

 with the Aplysia unguifera of the Mediterranean described by Rajïg. The latter is of a 

 greenish colour, and shows small round wartlets (»verruculis rotundis»). Its shell is 

 similar to that described above. 



As mentioned above, the relations of the nervous system, i. e. the situation of the 

 visceral ganglia were not to be determined, and so the fact is not certain, although prob- 

 able, that the present form belongs to the Notarchidae. It will then have to be referred 

 to the Aplysidla, which is likely to be identical' with the Dolabrifera. 



Aclesia, Rang. 



Aclesia, Raxg. Hist, natur, des Aplysiens. 1828. (p. 68) PI. XX, XXI, XXII. 



Notaeum sicut rhinophoria et tentacula villis majoribus simplicibus et compositis 

 instructum; fissura branchiali brevi. Scutum palliale sicut testa desunt; branchia. ren et 

 pericardium in cavitate branchiali libera (scuto non tectai. Podarhim non angustum. 



Ganglia visceralia antice, inter pleuralia sita. Penis conulis armatus. 



