292 GILBERT C. BOURNE. 



what is raorpliologically the left side of the foot. The minute 

 structure of the gills is curiously similar to that of An o mi a 

 ephippium. The velar filaments of the external demibranchs 

 bear special cilia. 



7. The intestine is coiled. 



8. The kidneys and the openings of the reno-pericardial 

 ducts and gonaducts into the kidneys are similar to those of 

 Anomia ephippium. The gonopores have ciliated funnels. 



9. There are extensive remnants of the pericardial gland. 

 The wall of the pericardial cavity is shown to be incorporated 

 with the walls of the ventricle and auricles. 



10. An internal ciliated groove runs along the whole length 

 of the caecum of the crystalline style. 



11. The left gonad extends far back into the left lobe of 

 the mantle. 



List of the principal Authors keferred to. 



1. Bareois, Th. — "Sur la structure de rAnomia ephippium," 'Full. 



Sci. Dep. Nord' (2), ii, 1879. 



2. Baerois, Th. — "Le stjlet crystallin des Lamellibianches," ' Rev. biol. 



Nord France,' i, 1890. 



3. Bourne, G. C. — "On Jousseaumin, anew genus of Eulamcllibranchs," 



' Report on the Pearl Oyster Fisheries and Marine Biology of the Gulf 

 of Manaar,' part v, Roy. Soc, 1906. 



4. BouTAN, L. — "Recherchcs sur le Byssus des Lamellibranclies," 'Arch. 



Zool. expcr. et gen.' (3), iii, 1895. 



5. Caueiere, J. — "Die Driisen im Fusse dcr Laniellibranchiaten," ' Arb. 



Zool. Inst. Wurzburg,' v, 1879. 



6. Geobben, C. — "Die Pericardialdriise der Laniellibranchiaten," 'Arb. 



zool. Inst. d. Univ. Wien.,' vii, 1888. 



7. HoRST, 1{. — "1st die Byssus eine Cuticularbildung?" 'Tijdschr. Ned. 



Dierk. Vcreen.' (2), ii, 1889. 



8. Lacaze Dutiiiers, H. re. — "Memoire sur I'organisation de TAnoniic 



(Anomia ephi[)pium)," 'Ann. des Sci. Nat.,' 4e ser., ii, 1854. 



9. Letellier. — " Etude sur le fonction urinairc clicz las Mollusques ace- 



piiales Lamellibranclies," 'Arch, de Zool. expdr. et gen. (2), v bis, 

 1887. 

 10. List, Th. — " Die Mytiliden," ' Fauna u. Flora des Golfes von Neapel,' 

 xxvii, 1902. 



