128 
Priate XVI. 
. Planaria gravata ? 
PLANARIA. 
. The same, enlarged. 
. Planaria hebes. 
. The same, enlarged. 
Planaria lactea, abstinent. 
The same, having fed, back. 
. Belly. 
. Head, enlarged. 
. Supposed ovum. 
. Planaria arethusa, adult, dark grey. 
. Specimen, adult, brown. 
. Head of a grey specimen. 
. Specimen, compressed, enlarged. 
. Extremity of fig. 10, regenerating the anterior part. 
. The same, become an entire animal. 
. Anterior section of fig. 11, regenerating the part defective. 
. Anterior section of another portion, regenerating the posterior part. 
. Middle section of the same specimen, regenerating the defective an- 
terior and posterior parts. 
. Posterior section of the same specimen, haying regenerated the de- 
fective anterior. 
. Planaria variegata, enlarged. 
. Planaria alba, enlarged. 
22. Head, more enlarged. 
3. Planaria gracilis. 
. Planaria alge, enlarged. 
. Head, more enlarged. 
26. Planaria falcata, enlarged. 
. Anterior portion, more enlarged. 
. Another specimen, shewing the internal organization, enlarged. 
. Another specimen, enlarged. 
. Planaria stagni, enlarged. 
. Planaria fecunda, enlarged. 
. Planaria flustre, enlarged. 
. Planaria voraz. 
. The same, enlarged. 
