OVULA. 407 



Simnia of Leaches MS. was founded on the solitary- 

 species which our seas produce ; the two Mediterranean 

 species assigned to it by Bisso (if they are not iden- 

 tical) have the outer lip inflected, with a notched edge ; 

 although he describes that genus as having the mouth 

 thin. 



Ovula pa'tula*, Pennant. 



Bulla patula, Penn. Br. Zool. iv. p. 117, t. lxx. f. 85 A. 0. patula, F. & 

 H. iii. p. 498, pi. cxiv.B. f. 1, 2, and (animal) pi. NN. f. 1-4. 



Body yellowish- white tinged with brown : mantle smooth, 

 loose about the neck, and having two lateral lobes, which 

 are reflected on the back of the shell, so as at times to cover 

 the whole of it ; these lobes are striped transversely with pale 

 red-brown or brownish fine lines, interrupted by small spots 

 or dots : pallial tube not extending one-eighth of an inch 

 beyond the canal or beak of the shell [" rather long," 

 F. & H.]: head consisting of a rather large and moderately 

 long contractile muzzle (not a proboscis), the mouth being 

 placed at its extremity underneath, with a concave disk which 

 is marked in a star-like fashion with white lines on very fine 

 plates ; at the bottom of this disk is a vertical orifice, within 

 which is the buccal mass, containing two strong white semi- 

 circular jaws with a short rough lingual riband running 

 between them : tentacles rather long and conical, somewhat 

 bluntly pointed ; they are white, and their extremities pale 

 brown tipped with white : eyes on very large broad stalks 

 (which are considerably raised) on the external angles of the 

 tentacles : foot very large, exceeding the limits of the shell 

 [" scarcely broader than the shell," F. & H.] ; it is truncated 

 or subangular in front [" its frontal angles are rounded," 

 F. & H.], marked lengthwise with intensely flake- white lines, 

 which, when the animal is at rest or not fully extended, 

 corrugate into distinct folds or plaits, and the front margin 

 of the foot then seems notched; it expands considerably 

 beyond the right side of the shell, and tapers behind, termi- 

 nating in a sharpish [" obtuse," F. & H.] point, much beyond 

 the posterior part of the shell ; sole grooved down the middle : 

 gills coarsely pectinated, forming a single plume : verge large 

 and flat, curved, and ending in a point. (Clark, MS.) 



* 



Open. 



