EXPLANATION OF THE PLATES OF ANIMALS. 



SERIES I. 



GENERA OF TUNICATA, ACEPHALA AND PTEROPODA. 



Plates A and B.— 1. Aplidium fcdlax. 2. Sidnyum turhinatum — 

 both from specimens taken on the shores of the Isle of Man (E. F.). 



3. Polydinum aurantium (miscalled gelatinosum in Plate B). 



4. Amouroucium. argus. 5. Leptoclimtm gelatinosum. 6. Di- 

 stoma ruhruin. 1 . Botryllus polycyclus. S. Botrylloides albicans. 

 The figures of Plate A, from 3 to 6, and fig. 8, are after Milne 

 Edwards. Those of Plate B are mostly after Savigny, and repre- 

 sent (greatly magnified) the individual mollusks extracted from the 

 common masses. 



Plate C. — 1. Ascidia mentida. 2. A.virginea. 3. A.scahra. 4. A. 

 echinata. 5. Molgida tiibulosa (arenosa of Alder) ; all from life 

 (E.F.). 



Plate D, — 1. Cynthia quadrangvlaris. 2. C. morus. 3. C. tessellata. 

 4. C. limacina. 5. C aggregata, 5. a. the tadpole of the last 

 highly magnified. 6. Molgula ocidata, adhering to a Pecten, and 

 encrusted with shells and sand ; all from life (E. F.). 



Plate E. — 1. Clavdlina lepadiformis, a. natural size of a group of 

 examples; h. a single individual magnified. 2. Perophora Listeri, 

 a. of the natural size, upon a fucus ; b. the same highly magnified. 



3. a. and b. Pdonaia glabra, in different states of contraction, 



4. Pelonaia corrugata ; all from life (E. F.). 5. The solitary, and 

 6. The aggregate individuals of Salpa nmcinata, from specimens 

 taken in the Scottish seas by Lieut. Thomas, R.N. 



Plate F. — 1. Animal of a Teredo; the upper figure representing the 

 siphonal extremity, magnified. 2. Xylophaga dorsalis, after a 

 sketch and specimens communicated by the Rev. D. Landsborough ; 

 the siphons, however, are not collateral at the extremity of the 



VOL. I. 3q 



