158 Dr. G. C. Wallich on the Type 



shell-dealer, of which I possess specimens. This species was 

 dredged by the late Professor Barrett at Jamaica ; and it is a 

 fossil of the Sicilian Tertiaries. I received specimens of the 

 latter from the Marquis di Monterosato as " Cadulus subfusi- 

 tformis^ Sars," and from Dr. Tiberi as " Siphonodentalium 

 Olivi, var. minor ^ Scac." 



An undescribed species of Cadulus, dredged bj Admiral Sir 

 Edward Belcher in the N.W. Pacific (for specimens of which 

 I am indebted to his kindness), is also allied to G. Olivi ; but 

 the narrower and smaller extremity has four slight notches and 

 corresponding slits. It is therefore possible that the genera 

 Siphodentalium and Cadulus should be united, and that Dis- 

 cMdes must " follow suit." 



Cadulus cylmdratus^ ^ Jeffr. 



Shell forming a narrow cylinder, slightly contracted at 

 each end, gently curved, thin, transparent, and glossy : sculp- 

 ture none, except a few microscopic and faint lines of growth : 

 mouth somewhat obliquely truncated, but not thickened : base 

 circular, with numerous minute notches, which are not per- 

 ceptible to the naked eye. L. 0*325. B, 0*075. 



Station 12, 1450 fms. ; a single specimen. ' Porcupine ' 

 Expedition, 1869, oiFthe West of Ireland, 1215-1476 fms. ; 

 very rare. 



XIV. — On the Fundamental Error of constituting Gromia the 

 Type of Foraminiferal Structure. By G. C Wallich, 

 M.D., Surgeon-Major Ketired List H.M. Indian Army. 



Rathee more than forty years have elapsed since the first 

 attempt was made by Dujardin to classify the Rhizopods. 

 During the latter half of this period, the study of these singular 

 organisms has not only been invested with much additional 

 scientific interest, but has received a powerful impetus from 

 its intimate connexion with the geological and biological rela- 

 tions of the deep-sea bed. And yet our knowledge of the 

 Rhizopods as a whole, and especially of the animal portion of 

 their structure, is by no means so complete as it ought to have 

 been, considering the amount of attention that has been 

 bestowed upon it. This, I venture to think, is in a great 



* Cylindrical. 



