VERMES. 91 



d. More than one of the Vermiculi have occurred with four distinct 

 eyes in definite position and arrangement. 



VEEMICULUS COLUBER Serpent-headed Worm. Plate X. figs. 22, 23. 



So many worms resemble serpents in miniature, that to find distinc- 

 tive corresponding names, expressive of their figures, would be a pre- 

 carious attempt. 



1. Length, an inch and a half; breadth, a line. Body flattened ; 

 anterior extremity obtuse, posterior tapering to a point. Head enlarging 

 from the narrower neck, with a dark quadrangular spot on the surface, 

 towards the front, a small black eye being at each angle. Body univer- 

 sally cream colour. Motion smooth and gliding. Marine and littoral. 



PLATE X. 



FIG. 22. Vermiculus coluber. 

 23. Head, enlarged. 



2. A variety, or distinct species, of small dimensions, occurs also as a 

 littoral marine animal. This extends above two lines, by less than the 

 third of a line in breadth, and is rather of a ruddy colour. Figure flatten- 

 ed ; eyes large, black, and distinct, and set in the same arrangement as the 

 former. The enlargement of the head is less definite. Motion gliding. 



PLATE X. 



FIG. 24. Vermiculus coluber ? 



e. VERMICULUS VARIEGATUS Variegated Worm. Plate X. figs. 25, 26. 



Length, eight lines ; thickness, about the fifteenth part of its length ; 

 form, cylindrical ; extremities rather obtuse. Towards the front of the 

 upper surface are four black eyes, set in long quadrangular arrangement ; 

 the two posterior are difficult to be seen. Colour universally variegated 

 red and white, with a white line down the back. 



