marine British Shells and Animals. 203 
Their general appearance has a strong resemblance to some of 
the naked larve of winged insects. 
Drrroris. 
Body gelatinous, anterior end truncated, from which issue two 
auricular appendages ; posterior end acuminated: mouth small. 
DriPLOTIS HYALINA. 
Tas. XIV. Fig. 6, 7. 
Dody taper from the anterior to the posterior end ; the front 
truncated, and furnished with two earlike projections pointing 
forwards; these are also truncated and concave, the margin 
ovate and purple, the concavity orange with a central dark spot: 
beneath these, at the lower extremity, the mouth is situated, 
Which is small, and a little protruded : along the sides.is a faint 
line forming a slight angle with the under part of the body: the 
back is a trifle convex ; the sides and belly are wrinkled: the 
posterior end is pointed and slightly tridentate. The colour is 
hyaline, with a few undulating intestinal markings of a yellowish 
appearance. 
Length half an inch. Devon. coast: rare. 
This is another Vermis of the order Intestina, which cannot 
be referred to any one of the present genera. In its general ap- 
pearance there is so much resemblance to the larva of some in- 
sect, that, had any such ever been known to undergo their trans- 
formation. in the marine element, some suspicion might have 
arisen with respect to the rank to which it should be consigned. 
But besides there being no well authenticated account of any 
insects changing their form in sea water, the situation in which 
this animal was found would be the strongest evidence of its 
marine origin. — fo — I | 
VOL. XI. 2E l REFE- 
