176 Mr. Toulmin Smith on the Ventriculidse 



Arethusa lactea, Mont. (sp.). 

 Roundstone, co. Galway, Mr. Barlee, by whom I have been 

 favoured with a specimen thence*. 



ECHINODERMATA. 



Thy one raphanus, Duben and Korenf. 

 A specimen was dredged from between fifteen to thirty fathoms 

 about Bantry bay by Mr. McAndrew in 1846. 



Zoophyta. 

 Alecto granulata, Edw. ; Johnst. Brit. Zooph. 2nd edit. p. 280. 

 pi. 49. f. 1, 2. 



Found attached to stones and shells brought up from deep water 

 in Belfast bay, &c. 



[To be continued.] 



XIX. — On the Ventriculidse of the Chalk. By J. Toulmin 

 Smith, Esq. 



[Continued from p. 97.] 



The structure which has hitherto engaged our attention is, 

 strictly, that of the polypidom only. It remains to seek the na- 

 tural affinities of the group the polypidom of which is marked 

 by these high characters of structure. 



The difficulty of this task will be readily appreciated when it is 

 considered that it involves an inquiry into the nature, in respect 

 to fossil bodies, of the parts most perishable and most difficult of 

 observation even in recent species, and that it becomes necessary 

 first to remove preconceived notions, and afterwards to begin de 

 novo to find out the true relations. Further than this, in the 

 structure which I have already described, the combined process 



* Mr. Wood, on looking over some species dredged at Lamlash (S.W. 

 Scotland) from a depth of about fifteen fathoms (coralline bottom) bv the 

 Rev. D. Landsborough and Major Martin, who favoured me with them, 

 named the following : — 



Quinqueloculina semilunaris, D'Orb. 



Quinqueloculina 1 



Spiroloculina depressa, D'Orb. 



Triloculina trigonula, D'Orb. 



Biloculina umbonata, Wood MSS. I have English specimens from Mr. 

 Barlee also. 



Guttulina communis, D'Orb. 



Plancii, D'Orb. 



Rotalina beccarii, Mont. (sp.). 



f In a memoir entitled " Skandinaviens Echinodermer " (p. 311. t. 11. 

 f. 58, 59), for a copy of which I am indebted to the kindness of Professor 

 Loven. 



