— 24 — 



M. barbata, Lamk. Comuioii. Aitachcd to rocks. Lengtb 

 54 mm.; breadth 29. 



M. vestita, Pliil. t Maltese name Zlnzla. Common. 



M. discrepans, Lamk. Eare. 



M. costulata, Piisso. Very rare. 



M. lithophaga, Lamk. ; syn. Lithodomus d.ictvlus. Maltese 

 name Tamra. Yery common. "With a variety which 

 rarely exceeds a decimctre in length. Found embedded 

 in the rocks. 



M. caud igera, Lamk. ; syn. Lithodomus caudigerus. Rare. 

 In com pact calcareous sandstone. Near L' Imgherbeb, 

 under the Lower Barracca. Also nnder Sun Rocco, 

 Marsamuscetto Harbour. (C. A. Wright.) 



M. petagnrc, Scacchi. Bare. Marsascirocco, 



M. zizyphina, t Nobis. * Malfcese name zlnzla. 



t Testa ventricosa, ohlonga, gibbosiuscula, solida, nitida, 

 zizyphina, iransverse striato-rugosa, ut plurimum lineis 

 minimis elevatis, interruptis, evanidis, rugas decussanti- 

 bus 5 margine ventrali postice declivi productiusculo, 

 coarctato, sinuatoque, lateribus sulco impresso longitudi- 

 nali antice convexo, medio subrecto, umbonibus evanido 

 dimidiata; natibus obtase angulatis, apicibus incurvis, 

 pallidis. Ligamento interno ; intus submargaritacea* 

 Millimetra 35 longa, 42 lata. 



Testa lapillis, fragmentisquo conchiliaceis proprio bysso con- 

 textis diu ponderose involucrata. 



Genus Mjtilus, L. 



M. galloprovincialis, Lamk. Maltese name Masclu. Found 

 attached to rocks on the coast, and on ships' bottoms, 

 and otlier floating objects. 



M. edulis, L. Common on rocks on the coast. 



M. minimus, Polii. Very common everywhere. 



+ This species is saiJ by Ph ilippi aud Aradas to be fouad only ia 

 Multa. 



