PLATE XX. 



[Part III.— Jauuari/ 1883.] 



Fig. 1, Macrochlamys longicauda, G.-A. : the extremity of foot^ from spirit-specimen, 

 X 12. 

 1 (I. Ditto: the extremity of foot, showing the long lobe over the mucous gland. 



Drawn from life. 

 1 h. Ditto : the mantle, from spirit-specimen, x \2. 

 1 c. Ditto : jaw, x 20. 

 1 d. The odontophore, central and median teeth, x 720. 



1 ('. Outermost laterals, x 720. 



2. Macrochlamys lailangkotensis, G.-A., jaw of, x 50. 



2 a. Ditto ; central and median teeth up to the 7th, and 8th, 9th, and 10th laterals ; 



2b, 11th, 12tb, and 13th laterals; 2c, the outermost laterals, x 720. 

 .'5. Macrochlamys tugurium, Benson, showing the shell- and mantle-lobes : lettering 

 as above. Res.or., respiratory onticc. In 3, 3 a, the l.s.l. would turn backwards 

 over the edge of the shell. 



