130 



British Animals not generally known 



25 ^^, 



Asci'dia? //olothu'ria? a'nceps. (7%-. 25. «) — Sessile, 

 elongate, irregular in form, obscure greenish yellow, one of 

 the apertures lateral, erect, subterminal. Mouths crateriform, 

 with 8 or 9 segments, from each point of union a row of 

 bright yellow oval dots leading directly to the orifice, which, 

 on pressing the body, emits a jet of w^ater. The interior 

 structure was not examined, so that no opportunity occurs of 

 referring it to its proper position. It appears to approach in 

 form to Ascidia prunum. Dredged up off Carrickfergus, Belfast 

 Lough, August, 1811. {b,c. Views of the mouth, magnified.) 



26 



a, The animal of the natural size. b. The same magnified. 



c, A profile of the anterior portion magnified. 



An atom is an ample field." Cowper. 



^A^is Lin. ^ERPENTf NA Gmcl. {fg. 26. a) — Hyaline ; the 

 convolutions of the intestinal canal obvious. Two dark spots 

 mark the position of the eyes, which seem made up of nume- 

 rous irregular black points. Mouth immediately beneath the 

 eyes. The snout rounded. A single row of simple spines is 

 protruded from the belly at the will of the animal ; a sheath, 

 easily distinguishable, receives them when retracted. The 

 intestinal canal continues in constant action. 



If this be Nai5 serpentina, and I am disposed to believe it 

 is, it agrees indifferently with the generic character of La- 

 marck, and the specific of Miiller. The former describes the 



