NOTARCHUS. 137 



The figures of Cuvier, Rang and Mobius correspond moderately 

 well. Bang's (pi. 61, figs. 56, 57, 58,) were drawn from specimens 

 which had been in alcohol. The figures given by Quoy and Gaimard 

 (pi 17, figs. 12, 13) represent the living animal ; but are so different 

 from the others as to excite suspicion that a distinct species may be 

 represented. Whether this diversity is wholly due to the fresh or 

 alcoholic condition of the specimens figured cannot readily be de- 

 cided. 



K PUNCTATUS Philippi. PI. 40, figs. 1-13. 



Length 8-4'5 cm. or less. Animal oblong, swollen and much 

 dilated at the sides, acute behind (figs. 1, 3, 12, 13). Head globose, 

 on a rather short neck. Anterior tentacles cylindric-conic, open 

 above, the margins rolled together below, continuous with the frontal 

 veil (fig. 4, head seen from beneath). Rhinophores shaped like the 

 tentacles, but open behind ; the eyes sunken in the integument a 

 little in front of the bases of the rhinophores. Surface of body 

 bearing numerous somewhat dendritic or branching conic tubercles, 

 irregularly scattered. Foot forming a smooth, quite narrow band, 

 acute behind. Penis having a number of chitinous spurs distributed 

 over its surface (fig. 11). 



Color in life a yellow-fawn tint, with irregular spots of deeper 

 color and a minute white punctation. Alcoholic specimens retain 

 quite well the general tint, but the tissues lose their transparence. 



Shell (fig. 10, magnified 25 diameters) minute, diam. 2 mill., very 

 fragile, hyaline, placed under the mantle behind the anus, of the 

 form of that of Coriocella. 



Mediterranean : Gulf of Marseilles, 15-25 metres, on Zostera 

 (Vayssiere) ; Palermo (Philippi, Monterosato) ; Nice (Verany). 



Notarchus punctatus PHIL., Enumeratio Molluscorum Sicilise, 

 1836, p. [255], pi. 7, f. 9. VAYSSIERE, Journal de Conchy 1., 1882, 

 p. 271, pi. 11, f. 8; Recherches Zool. et Anat. sur les Moll. Opisto- 

 branches du Golfe de Marseille, p. 77, pi. 3, f. 77-85 ; pi. 4, f. 86- 

 $5 (shell, anatomy). 



This Mediterranean species is now well known by the work of 

 Vayssiere. The larger tubercles of the surface are arranged in a 

 median series behind the gill slit, and two irregular rows on each 

 side. The presence of a minute vestigial shell was first demonstrated 

 by Vayssiere. 



