The Museum Gazette 



Fig. 14. Corbula nucleus (= C. gibba). Valves remarkably 

 unequal, the larger marked sometimes with pale crimson 

 rays ; the smaller always with a thick umber-brown 

 epidermis. 



Fig. 15. Crenella discovs (== Modiolavia discors). Very thin 

 and fragile, epidermis various shades of green and olive. 

 C. {Modiolavia) marmovata is more or less painted with 

 minute linear angulations of a liver colour upon a pale or 

 whitish ground. Epidermis green and shining. 



Bivalves. 

 Description of Plate IV. 



Fig. 1. Cypvina islandica (== Arctica islandica). Sometimes 

 exceeds four inches in breadth. Reddish-white with a glossy 

 fawn colour epidermis. 



Fig. 2. Artemis exoleta (= Dosinia exoleta). Cream colour, 

 rayed and variegated with livid red markings. A. tincta 

 {= lupina) is a much smaller species, ivory white, never 

 rayed, umbones tinged brown or orange. 



Fig. 3. Astarte sulcata. Solid, whitish or rufous, covered 

 with a dull thick yellow or chestnut epidermis. 



Fig. 4. Pectunculus glycimeris (= Glycymevis glycymeris). 

 Whitish or pale red with zigzag markings of dark red 

 arranged radially. Our figure more nearly approaches the 

 variety pilosus, in which the zigzag markings tend to a 

 concentric arrangement. 



Fig. 5. Lucinopsis undata. Opaque, glossy, fawn colour, 

 with fine and irregular concentric striae. 



Fig. 6. Tellinadonacina. Colour variable, usually yellowish, 

 with interrupted rays of a carnation red hue. T. crassa is a 

 larger species, rounded oval, with strong concentric grooves. 



Fig. 7. T. tenuis. Very thin and glossy. Colour variable, 

 " ranging from pale crimson through orange and yellow to 

 almost white." It is never rayed. T.fabula is ovate-oblong, 

 with oblique striae on the right valve only. 



