190 J. E. S. MOORE. 



on the tentacles themselves, hut on secondary papillae at their 

 posterior hases (PI. 20, figs. 5, 12, 6). There is a well-de- 

 veloped mucous gland in the mantle cavity (PI. 20, fig.5,m.g.), 

 and the animal, unlike the genus Spekia, is viviparous. On 

 opening up the body from before there is found to be a tolerably 

 well-developed buccal mass (PL 20, fig. 12, b. m.) ; the radular 

 sac is of average length, and the salivary glands are somewhat 

 tortuous, simple saccular organs (fig. 12, s.g.). The radular 

 dentition is strong and of the Littorino-planaxoid type 

 (PI. 20, fig. 8). 



From a portion of the radula obtained by Smith, Guatkin 

 referred it to the types approximating to the genus Cerithium, 

 while Smith himself remarked upon its similarity to the 

 radula of the Planaxidse. The oesophagus is long, narrow, 

 and simple, and leads into a large stomachic chamber (PI. 20, 

 figs. 9 and 11, also Fig. I, page 189), on the walls of which 

 there are numerous glandular folds (fig. 11), and a very curious 

 and striking double hemispherical caecum on the floor (fig. 11, 

 and Fig. 1, p. 189), between the folds of which the curiously 

 rectangular orifice of a single bile-duct opens (fig. 11, a.h.d.). 

 Besides this stomachic chamber there is an anterior diver- 

 ticulum into which the large stomach opens by a tubular aper- 

 ture, through which a bristle is represented as passing in fig. 

 W^w. X., and in this anterior stomachic chamber there lies an 

 almost spherical crystalline style. The intestine passes out of 

 the stomach beneath the tubular aperture between the posterior 

 and anterior stomachic chambers, as indicated by the bristle 

 represented in fig. 11, y. z., also Fig. I, p. 189. The intestine 

 is simple, almost straight, and towards its rectal extremity it 

 contains a number of glandular folds and striae. 



The liver is large, and occupies the lower two thirds of the 

 last two whorls of the animal's body. Tliere is a single bile- 

 duct, opening, as has already been stated, in the posterior 

 chamber of the stomach. 



The heart has the normal taenioglossate characters, and con- 

 sists of a thin-walled auricle, a thick-walled ventricle, and a 

 short aortic trunk (PI. 21, fig. 1). Between the auricle, ven- 



