188 



MR J. D. MACDONALD ON THE LIVING CLIO CAUDATA. 



Explanation of Plate IX. fig. 3. 



1. Clio caudata, &c. 



2. The second species alluded to in the text. 



Both are about the natural size ; and 

 the appearance presented by a trans- 

 verse section, near the caudal ex- 

 tremity, is given immediately below 

 each figure. 



3. Enlarged figure of the head, proboscis, 



and cephalic arms of Clio caudata in 

 the expanded state. 



a. Proboscis, &c. 



b. Its pointed extremity. 



c. Oral cavity. 



d. Anterior or lower lip, armed with teeth. 

 d'. Do., magnified. 



e. Tongue with lingual pavement. 

 e'. Portion of the lingual dentition magnified. 

 /. Lateral or cheek pouches, with their 



curved conical teeth. 

 /'. Do., magnified. 

 gg. The four cephalic arms, with their minute 



suckers. 

 g'. One of the suckers magnified: 1. lateral 



view ; 2. in face. 

 h. The four minute tentacula, of which the 

 posterior pair is regarded as eye pe- 

 dicles. 

 i. Head. 



k. Swimming fins. 

 I. Auditory sac, with otoconia. 



