180 DR. T. DAVIDSON ON KECENT BRACHIOPODA, 



Figs. 15-19. Plati/dia anomtoides, Scacclii, sp. 15. Specimen dredged by E. Forbes in tlic ^'Egean Sea. 



IG. Dredged by the ' Challenger' Expedition off Marion Island (Zool. Dept., British Museum). 



17. Dredged by W. S. Kent off Setubal, coast of Portugal^ near the Tagus (Davidson Collection, 



Geol. Dept., British Museum). 18. Interior o£ dorsal valve. 19. Interior of dorsal valve, 



enlarged to show labial appendages (after E. Deslongchamps) . 

 Figs. 20-22. Terebratula seminultun, Philippi (a synonym of Platydia anomioides). From the 



Mediterranean. After Philippi's figures. 

 Figs. 23-27. Plutijdia Davidsoni, E. Deslongchamps, sp. From the Mediterranean. 23. Type. 



23 a, b. Enlarged. 24. Spiny surface of ventral valve, much enlarged. 25. Fragment to 



show the foramen. 2G, 27. Interior of dorsal valve (after drawings by E. Deslongchamps). 



(Davidson Collection, Geol. Dept., British Museum.) 

 Figs. 28, 29. Gmi/n'ui capsu/a, Gwyn Jeffreys, sp. Specimen, much enlarged, from Belfast Bay (Davidson 



Collection, Geol. Dept., British Museum). 29. A very young shell, much enlarged (after Gwyn 



Jeffreys). 

 Figs. 30-35. Argwpe decollata, Chemnitz, sp. From the Mediterranean. 30. Natural size (Davidson 



Collection, Geol. Dept., British Museum). 31. Dredged by the 'Challenger'' Expedition off 



Gomera, Tenerifte (in the Zool. Dept., British jNIuseum). 32. A very young shell dredged at 



Cape Breton (Marquis de Folin's Collection) . 33. Interior of dorsal valve, enlarged. 34 a. 



Interior of ventral valve, much enlarged (after E. Deslongchamps). 35. Interior of dorsal valve, 



much enlarged, showing the labial appendages. 



Plate XXII. 



Figs. 1-4. Cistella cistellula, Searles Wood, sp. 1. Natural size. 1 a, b. The same, enlarged ; from off 

 Shetland Island. 3. Interior of dorsal valve; enlarged. (1,3. Davidson Collection, Geol. 

 Dept., British Museum.) 2. A young specimen, enlarged (after Gwyn Jeffreys) . 4. Interior of 

 both valves of the same species, showing the powerful muscles on the ventral valve and the 

 labial appendages on the dorsal one. 



Figs. 5, 6. Cislc'l/a? //««/b'fl, Philippi, sp. 5-5 c. Figures after Philippi. 6. A perfect specimen, enlarged, 

 from the Mediterranean ; sent to me by the Marquis of Monterosato. 



Figs. 7-7 c. Cistella Woodwardiana, Davidson, sp. 7. Natural size; dredged by Lucas Barrett on the 

 N.E. coast of Jamaica (from the tj'pe, in the Cambridge Museum). 7 a, b, c, enlarged. 



Figs. 8-24. Cistella neapolitana, Scaechi, sp. 8, 9, 10. Three examples from the Mediterranean 

 (Davidson Collection, Geol. Dept., British Museum). 11. Interior of dorsal valve. 12. Interior 

 of ventral valve. 13-24. After A. E. Shi^jley : — 13. Ovum. 14. Ovum with two segments. 

 15. Ovum with three segments. 16. Gastrula. 17. Larva with two segments, showing the stalk 

 attaching it to the walls of the brood-pouch. 18. Larva showing traces of three segments, 

 with eyespot c and commencing bristles : the outline of the alimentary canal is seen faintly. 

 19. Slightly older larva. 20. Larva with two kinds of cilia on the first segment: the second 

 segment has already begun to grow down over the third, which has constricted slightly into two 

 parts. 21. Free-swimming larva seen from the ventral side. 22. Free-swimming larva seen 

 laterally. 23. Young Argiope, the lophophore still circular, with twelve tentacles : the liver is 

 growing out as two lateral diverticula of the stomach. 24. View of the ventral shell of the same. 



Figs. 25, 25 a. Chlella bipUcutu,'^c<^\\e\viA, sp. (probably Cistella neapulitana). From off' ]\Iessina. (Type 

 from Segucnza's Collection.) 



Figs. 26, 27. Cistella Kowalevskii, Schulgin, sp. After Schulgin's figures. Enlarged. On Posidunia 

 off Sardinia. 27. Shell-structure. (Schulgin's Collection.) 



Fig. 28. Cistella (jlubulijorinis, Schulgin, sp. ; after his figure. On stones off Sardinia. (Schulgin's 

 (Collection.) 



Fig. 29. C«/e//a? iJarroisi, Schulgin, sp. ; after his figure. On stones at Villafranca; much enlarged. 

 (Schulgin's Collection.) 



Figs. 30-34. Cistella cuneata, Risso, sp. 30-31 b. Exterior of two examples from the Mediterranean 

 (Davidson Collection, Geol. Dept., British Museum). 32. Interior of dorsal valve. 33. Interior 



