EXPLANATION OF THE PLATES. 

 Plate 



I. "1 Dissections. — Thorax of Blow-fly and other Insects, illustrative 

 II. i of Mr. A. Hammond's researches. 



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

 scribed by Prof. Duncan. 

 IV. Argentina sphye^na in side view, and stomach and ctecal 

 appendages. 

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

 Bell's and Mr. Stewart's papers. 



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



Duncan. 



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



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

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

 teristic parts referred to by Sir J. Lubbock. 



IX.) 



' Specimens of Solanocrinus, Antedon, Actinometra, Pentacrinus, 



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



' their relations to recent Comatulce. 



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



obtained in the North-Polar Expedition. 



XIV. 1 



XV I 



■ Ascidians, and Structural parts of same magnified, being figures 



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



XVIL I Tunicata. 

 XVIII. I 



XIX J 



XX- \ Duegella. — Anatomy of the genus described by Lieut.-Col. 

 XXI. J Godwin- Austen. 

 XXII- \ Q-AMASIN.E, as coming under the observations of Mr. A. D. 

 XXIII. J Michael. 



XXIV. "I Spicela of Lithistid Sponge and of a species of Aphrocallistes 

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

 XXVI. ] Chitinoes Appendages of species of Cellepora, illustrating Mr. 

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

 XXVIII. \ Echinodictyem, new species of. 



XXIX. J Steecteeal details of species of Dirrhopalum. 



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

 paper on Sponge's = Schmidt's genus Plocamia. 



