Messrs. Hancock and Embleton on the Anatomy of Eolis. 87 



rior transverse muscles to open jaws; c, anterior ditto to close 

 jaws ; d, inferior ditto to close jaws. 



Fig. 11. Same view as fig. 10 : a, corneous plates; b, muscles of inner lip ; 

 c, inner lip. 



Plate II. 

 All the anatomical figures in this plate are from E. papillosa unless other- 

 wise stated. 



Fig. 1. Two views of transversely arched plates from ridge of tongue, mag- 

 nified, to show the spines. 



Fig. 2. Anterior aspect of buccal mass, with lips and lateral muscles re- 

 moved: a, cutting-edges of jaws ; h, superior anterior transverse 

 muscles ; c, inferior ditto ; d, tongue appearing between cutting- 

 blades. 



Fig. 3. Lateral view of buccal mass of E. coronata. 



Fig. 4. Muscular cheek-masses inclosing o, the tongue ; the horny plates 

 have been removed ; h, flat upper free border of masses ; c, ante- 

 rior pointed extremity of muscular masses attached to lower end 

 of cutting-blades ; d, oesophagus. 



Fig. 5. External lateral view of horny plate, all muscles removed : a, ridge 

 giving origin to muscles of inner lip ; c, portion of same giving 

 origin to muscles of outer lip ; &, cutting-blade. 



Fig. 6. Same view of horny plate oiE. coronata. 



Fig. 7. Interior view of horny plate of E. papillosa : a, fulcrum or hinge ; 

 b, cutting-blade ; c, line dividing the origin of the anterior and 

 posterior superior transverse muscles. 



Fig. 8. Front view of horny plates of E. coronata. 



Fig. 9. Digestive apparatus of £. papillosa, the glands of the papillae re- 

 moved : a, buccal mass ; b b, corneous plates of same ; c, oesopha- 

 gus ; d, bulb of stomach ; e, true intestine ; /, anus; g, great central 

 canal leading from stomach and ending posteriorly in a blind sac ; 

 hf a primary branch from digestive cavity ; i, secondary branches ; 

 k, ducts from glands of papillae. 



Fig. 10. Teeth of E. nana. 



Fig. 11. Spiny ridge of tongue ofE. alba. 



Fig. 12. Upper aspect of three plates of same. 



Fig. 13. Portion of spiny ridge of E. olivacea. 



Fig. 14. Upper aspect of two plates of same. 



Plate III. 



Fig. 1. Digestive apparatus of E. coronata; the letters correspond to those 

 offig. 9, PI. II. 



Fig. 2. Digestive apparatus of E. olivacea ; letters as above. 



Fig. 3. Upper aspect of two plates of spiny ridge of tongue of E. nana. 



Fig. 4. Digestive apparatus of ^. despecta; letters as in fig. 9, PI. II. 



Fig. 5. Salivary gland and duct of E. papillosa, highly magnified. 



Fig. 6. Lateral view of buccal cavity and cheek-rnass of E. papillosa, one 

 horny plate removed : a, salivary gland ; b, horny plate ; c, part 

 of cheek-mass attached to horny plate ; d, flattened upper border 

 of cheek-mass ; e, anterior extremity of cheek-mass passing to its 

 attachment to inferior points of cutting-blades ; /, free part of ex- 

 ternal surface of cheek-mass. 



Fig. 7. Stomach of E. papillosa laid open, showing rugae of internal sur- 

 face of bulb, central canal, primary and secondary branches. 



Plate IV. 

 Fig. 1. Papilla with gland of E. concinna. 



