124 



APHRODITACEiE. 



1. S. boa, scales entirely covering the back, reniform, roughish, 

 ciliated on the external margin ; lateral antenna? a common stalk, 

 with three setaceous palpiform appendages articulated on its top. 

 Length 8" ; breadth 4'". No. XIX. and PI. V. fig. 6-15. 



Sigalion boa, Johnston in Loud. Mag. Nat. Hist. vi. 322 (1833), 

 f. 42, and in Ann. Nat. Hist. ii. 439. pi. 23. f. 6-15. Williams, 

 Rep. Brit. Assoc. 1851, 201. 



Sigalion Idunse, H. Rathke in Nov. Act. Acad. Ccesar. Nat. Cur. xx. 

 150 (1843), tab. 9. f. 1-8. Gruhe, Fam. Annel. 38. 



Nereis squamosa, Leach, Mus. 



Hab. The littoral region near low- water mark. 



Desc. Body seven or eight inches long, linear, flattened, slightly 

 tapered towards the tail, the anterior extremity obtuse and somewhat 

 rounded, the beak covered with two rows of scales of an ash or some- 



No. XIX. 



a. Sigalion boa of the natural size. b. A scale enlarged. 



c. Side view of a foot magnified. 



times reddish-brown colour, but as some of the scales are often paler 

 or whitish, the body then appears piebald. Head small, convex, 

 corneous, concealed by the rounded anterior pair of scales, terminated 

 in front with three short setaceous two-jointed antennae, the central 

 one larger and longer than the others. Eyes none, but at the base 

 of the least antennae there are two depressed punctures very like 

 eyes. Palpi two, setaceous, half an inch long, arising above and at 

 the sides of the mouth. Mouth inferior, furnished with a retractile 



