MANGELIA. 475 



moderately arcuated outer lip, which, although strength- 

 ened a little distance behind by a varix-like rib, is acute 

 at the edge, where it is finely jagged by the external 

 sulci. This thin portion, which advances in the middle, 

 but recedes again at the base, gives a greater apparent 

 depth to the upper sinus. The pillar is rounded, devoid of 

 sculpture, and tolerably perpendicular, there being no 

 marked concavity in the middle of the inner lip. A mag- 

 nificent specimen from Bray measured an inch and a half 

 (Barlee), but ordinary examples are only ten lines and a 

 half long, and three lines and a half broad. 



A pretty variety in Mr. Jeftreys'' collection is encircled 

 by an interrupted brown line, that wdnds between the 

 ribs immediately below the concave area. 



We have figured the animal from a drawing by 

 Mr. Alder ; a detailed description of it has been published 

 by Mr. Clark. It is of a general white hue, with fleshy 

 specks and numerous minute pink lines and dots, so as to 

 give the body and siphon in many examples a general 

 rosy tint. The tentacula are short and thick, with the 

 eyes borne on their thickened portions at less than a third 

 of their lengths from the tip ; their bases are set rather 

 apart. The foot is ample and lanceolate, pointed behind, 

 truncate and obtusely auriculated in front. This creature 

 secretes an indigo blue fluid, with a garlicky odour 

 (Alder). 



This is one of our more southern forms, becoming more 

 and more rare as we proceed northwards, and probably 

 absent from the east coast. It is abundant in the coral- 

 line zone at Exmouth (Clark), and rather common at 

 Torquay (S. H.) We have met with it dead in thirty 

 fathoms on the Devonshire coast, and alive in twelve 

 fathoms among stones and mud on the north and south 



