S Mr. F. p. Pascoe on new Genera 



Fig. 3. Ovum of G. ceglefirms, some time after closure of the blastopore ; 

 the embiyo fairly advanced, but the yolk {y) shows very shght 

 diminution. 



Fig. 4, Ovum of G. caglejinus ; embryo about to emerge from the egg- 

 capsule, which is ruptured. The yolk (?/) has diminished to 

 some extent, and a perivitelline chamber intervenes between the 

 yolk-surface and the embryonic membrane (e.m.). 



Fig. 5. Emerged embryo of a Pleuronectid, species not known. Portion 

 of the yolk seen protruding from an accidental rupture in the 

 embryonic membrane (e.m.). 



Fig. 6. Embryo of Gadus ceglefinus, six days after hatching ; yolk {y) still 

 persisting, but showing very evident diminution. 



Fig. 7. Transverse section through embryo of Petromyzon (after Shipley). 

 Yolk-cells (y) entering actively into the formation of the embry- 

 onic tissues, especially the gut (g) : n, notochord ; mes., meso- 

 blast. 



Fig. 8. Transverse section of Gadus cegle-finus, about same stage as fig. 7. 

 The yolk (?/) is separated from the embryo by the cortical 

 protoplasm (c./).) and the hypoblast (hyp.), and does not directly 

 form embryonic tissue, w, notochord ; mes., mesoblast. 



Fig, 9. Diagram of Teleostean ovum when the periblast (perib.) is first 

 clearly distinguishable. The radial arrows indicate the passage 

 towards the surface of the protoplasm miugled with the yolk 

 (y), and foiTaing the cortical protoplasm (c.p.). g, germ. 



Fig. 10. Diagram of Teleostean ovum at a later stage. No intra-blasto- 

 dermic segmentation-cavity exists ; but a germinal cavity (g.c.) 

 exists, roofed over by the germ and floored by periblast (pei'ib.). 



Fig. 11. Transverse section of G. (pylefinus on second day after hatching. 

 The cortical protoplasm (c. p.) still separates the embryo from 

 the yolk (?/). The hypoblastic gut (g) is now fully formed and 

 invested by a layer of mesoblast; its lumen is ciliated, e.m., 

 embryonic membrane formed of two layers, epiblast and hypo- 

 blast. 



II. — Notes on Coleoptera, with Descriptions of new Genera 

 and Species. — Part YI. By Feancis P. Pascoe, F.L.S., 



&c. 



[Plate I.] 



List of Genera and Species. 



COLYDIID^. TELEPHORID^. 



Bothrideres impressus. 



Deilinje. 

 PTINID^. 



. Eugeusis nigripennis. 



ANOBIINiE. ggi^3i^ p^l^|^^_ 



Clada (w. g.) Water housei. laticeps. 



