NOTES ON RETICULARIAN HIZOPODA. 273 



these figures are taken are probably merely fragments, and 

 no description of genus or species is given beyond that con- 

 veyed in the terms " simple, calcareous, subsegmented, 

 branching, Nodosarian form." The diagnosis is further 

 complicated by the author referring to the same genus, '^the 

 so-called Dentalina (?) aculeata'"' of the Chalk. D'Orbigny's 

 Dentalina aculeata, as far as 1 can gather from the original 

 description and figure,' is a characteristic and easily recog- 

 nised true Dentalina, and why it should be associated with 

 any " Ramuline" form it is difficult to understand. Having 

 for some time past been collecting materials for the study 

 of the Cretaceous types of Foraminifera I have become quite 

 familiar with the organisms figured by Mr. Wright, and I 

 believe them to be closely allied to the recent species above 

 described, I have, therefore, adopted the generic term pro- 

 posed by Professor T. Rupert Jones, and must leave the 

 determination of the distinctive characters of the recent and 

 fossil species until better specimens of the Cretaceous forms 

 can be found to serve as a basis for their more accurate 

 treatment. 



The test of Hamxdina glohuUfera is always hyaline and 

 perforate, and usually more or less hispid. The genus is 

 probably nearly related to the Nodosarince, as suggested 

 in the foregoing quotation, but its branching habit of growth 

 is an essential and distinctive feature. 



The " Challenger" dredgings have yielded examples from 

 at least nine or ten stations. These are, for the most part, 

 at no great distance from island groups, either in the 

 North Atlantic or in the South Pacific ; the depth of water 

 ranging from 145 to 600 fathoms, and the bottom commonly 

 consisting of coral debris or shelly sand. 



Genus— VYlGERm A, d'Orhigny. 



The specimens from the " Challenger" collections repre- 

 senting the genus Uvigerina form an exceedingly interesting 

 series, and there is one group in particular, namely, that 

 embracing the dimorphous varieties, on which considerable 

 new light is thrown by them. The general characters of 

 Ucigerina (proper) are well understood, but this is far from 

 being the case Avith the forms assigned to the genus or sub- 

 genus Sagrina. 



Normally, Uvigerina may be described as having an elon- 

 gated spiral test, the clustering chambers of which are 

 1 'Mem, Soc. Geo!. Fr./ 18i0, vol. iv, p. 13, pi. 1, figs. 2, 3. 



