Vll 



u) 



EXPLANATION OF THE PLATES. 

 Plate 



Dissections. — Thorax of Blow-fly and other Insects, illustrative 

 of Mr. A. Hammond's researches. 



III. Enlarged Views and Details of Polypholis echinata, as de- 

 scribed by Prof, Duncan. 



IV. Argentina sphyr^na in side view, and stomach and ca^cal 

 appendages. 



V. Amblypneustes. — Abnormal specimens of, illustrating Prof. 

 Bell's and Mr. Stewart's papers. 



VI. Hemipholis Wallichii, a form of Ophiuran described by Prof. 

 Duncan. 



VII. Mackerel figured by Dr. Day, as combining the characters of 

 Scomber punctatus, Couch, and S. scomber, Linn. 



VIII. Camponotus inflatus, a new species of Honey-Ant. Charac- 

 teristic parts referred to by Sir J. Lubbock. 



IX." 



. Specimens of Solanocrinus, Antedon, Actinometra, JPentacrinus, 



' V and Promachocrinus, illustrating Mr. Carpenter's paper on 



their relations to recent Comaiulce. 

 Xli-. J 



XIII. Arctic Polyzoa, illustrating Mr. Busk's account of specimens 



obtained in the North-Polar Expedition. 



XIV. ^ 

 XV. 



XVI. 



Ascidians, and Structural parts of same magnified, being figures 

 y illustrative of Mr. Herdman's researches on the British 

 Tunicata. 



XVII. 

 XVIII. 



XIX J 



XX. 1 Dtjrgella. — Anatomy of the genus described by Lieut.-Col. 

 XXI. J Godwin- Austen. 



XXII- \ G-amasiNjE, as coming under the observations of Mr. A. D. 

 XXIII. J Michael. 



XXIV. 1 Spicula of Lithistid Sponge and of a species of Aphrocallistes 

 XXV. J from the coast of Spain, described by Prof. Duncan. 



XXVI. 1 Chitinous Appendages of species of Cellepora, illustrating Mr. 

 XXVII. J Busk's views on their value as characters for classification. 



XXVIII. "I Echinodictyum, new species of. 



XXIX. > Structural details of species of Dirrhopalum. 



The two plates illustrating Mr. Eiclley and Prof. Duncan's 

 paper on Sponges = Schmidt's genus Tlocamia. 



