282 Messrs. W. K. Parker and T. Rupert Jones on some 



the Chalk, the tertiary LinguliruB of San Domingo, and the recent 

 ones of the Canaries f. 



4. Nodosaria {Dentalina) communis, D^Orb. PL X. figs. 3, 4, 5. 



Nodosaria (subgen. Dentalina) communis, D*Orb. (Anu. des Sc. Nat. vii. 

 p. 254. no. 35.) 



Shell hyaline, elongate, tapering, somewhat bent, circular in 

 section, composed of several chambers; sutures more or less 

 constricted ; aperture produced, small, round, central or excentric. 



Fig. 3 was dredged at 160 fathoms on the Finmark coast ; 

 figs. 4 and 5 represent an individual from 60 fathoms at West 

 Fiord, Nordland. 



This form is of frequent occurrence in the Chalk and the 

 Tertiary deposits j and is found also, but usually of a small size, 

 in the recent sea-sands. 



The infinite varieties presented by these delicate, tapering, 

 arcuate Nodosaria (or Dentalince, as they are usually termed) 

 have, as far as authors haye been able to figure them, received 

 name upon name ; and it will require much research to arrange 

 the varieties under normal specific types. 



4*. Nodosaria, PI. XI. figs. 1, 2. 



Nodosaria {Dentalina) communis, var. fig. 1. 

 Nodosaria ( Vaginulina ?) ? fig. 2. 



These are fragments (figured upside down) of two stichoste- 

 gian shells, with oblique, closely-set chambers. 



Fig. 1 has its chambers somewhat separated by sunken sutures, 

 and its section transversely is nearly round. It belongs to the 

 same type as D. communis. 



The other (fig. 2) is not constricted at the junctions of the 

 chambers ; it is elliptical in cross-section, and is ornamented with 

 slight, irregular, longitudinal riblets. [The apparent aperture in 

 fig. 2 arises from the first chamber having been broken open.] 

 One other fragmentary specimen occurred, consisting of the base 

 or first few chambers, similar in character to fig. 2, but having 

 a large primordial chamber and a faintly helical arrangement of 

 the two next chambers, before the axis of the shell takes the 

 straight direction ; thus approaching the so-called " Vaginulinse^' 

 and " Marginulinae" in the mode of growth of the early seg- 

 ments, in the nearly uniform size of the chambers, and their 

 elliptical transverse sectional area. 



These nearly straight, obliquely-chambered Nodosaria have 

 numerous representatives, both in the recent and the fossil state. 



t Hist. Nat des iles Canaries, Foram. p. 124. pi. 1. f. 5, 6. 



