192 34 



This specimen is said to have been velvet black when living: it was in spirit 

 quite black, a little lighter at the sides of the body. Its length was 2 - 5 cm , by a breadth 

 of l-5 cm . and a height of 0-6™. 



The form was as usual. The diameter of the branchial tuft, which was formed of 

 8 leaves, was 8°™. 



The yellowish glans penis projecting from the genital aperture, had a length of 

 ø.35mm ; an( j was armed with about 12 irregular quincuncial series of hooks; the armature 

 continued in the common way into the seminal duct, at least to a length of 6"™. The 

 hooks were yellowish, almost always straight, of a length of up to (M™™ (fig. 17). 



Doriopsilla, Bgh. 



R. Bkrgh, die Doriopsen d. Mittelmeeres. Jahrb. d. malacozool. Ges. VII. 1880. p. 316—326. Taf. 11, 

 Fig. 3—11. 

 — üb. die Gattung Doriopsilla. Zoolog. Jahrb. IX. 1896. p. 454 — 458. 



The genus Doriopsilla is already externally distinguished from the Doriopsis, 

 which are all soft, and mostly with smooth back, by their stiffness and the granu- 

 lous nature of the back and still more by the quite different situation of the 

 buccal ganglia. 



In the whole large group of Gasteropoda the situation of the buccal ganglia 

 is below the pharynx, accordingly backward on the upper side of the pharyngeal bulb ; the 

 organ situated before these ganglia, is the bulbus pharyngeus, and behind them the oeso- 

 phagus begins. The fore end of the alimentary canal is, in all Doriopsididae , a peculiar 

 suctorial apparatus , and as well mandible plates as tongue is wanting. In the genuine 

 Doriopsis the buccal ganglia are situated at the hinder end of a long, cylindric, muscular 

 tube, where also the small salivary glands open. To judge by the place of these ganglia 

 and the salivary glands, this tube would have to be regarded as a bulbus pharyngeus. 

 This arrangement is quite different in the Doriopsillae. In the latter the buccal ganglia 

 are situated at the fore end of this tube, at the base of the pharyngeal cone, close behind 

 the pedal ganglia. The arrangement of the alimentary system in the Doriopsillae is 

 otherwise quite as in the Doriopsis, and so the single parts of the system should be homo- 

 logous. But this is, according to the situation of the buccal ganglia, which seems other- 

 wise to be determinative, not the case here. In the Doriopsis, in which the ganglia are 

 situated far behind, the long tube ending in the pharyngeal cone, was to be regarded as 

 the pharyngeal bulb ; while in the Doriopsillae , where the buccal ganglia are situated 

 before, the pharyngeal cone alone represented the bulbus pharyngeus, and the part behind 

 the bulb, the oesophagus. 



