23 Messrs. Parker, Jones, and Brady on the 



Model no. 57. Bigenerina Nodosaria*, D^Orb. Page 2G1, no. 1, 

 pi. 11. figs. 9-12. 



Hab. Adriatic. PI. II. fig. 62. 



A subtypical form of Textularia, with a flat wide commence- 

 ment, but taking on a cylindrical uniserial mode of growth in 

 its later chambers. It is a common form in the Mediterranean 

 and many other seas, and has been found as far north as Shet- 

 land. 



Model no. 58. Bigenerina (Gemmulina) digitata^, D'Orb. 



Page 262, no. 4. 

 Hab. The Mediterranean. PI. II. fig. 61. 

 Narrower in the growth of the early chambers than B. Nodo- 

 saria, having frequently a curved and compressed contour. 

 This form and the preceding have usually the subarenaceous 

 shell-structure of the larger Textularice. 



Model no. 59. Vulvulina Capreohs*, Defr. Page 264, no. 1, 

 pi. 11. figs. 5-8. 



Hab. Adriatic. PI. II. fig. 63. 



D^Orbigny refers this species to Defrance; but we are unable 

 to find any notice of it in Defrance's works. 



As we have before stated, this is Grammostomum Pennatula, 

 Batsch, sp. 



Model no. 60. Dimorphina tuberosa, D'Orb. 

 Page 264, no. 1. 



Hab. Mediterranean. PI. II. fig. 53. 



Some very dissimilar forms have been grouped under the 

 name oi Dimorphina. As this is the first mention of the generic 

 term, we propose to confine its application to the Dimorphine 

 varieties of Polymorphina, of one of which Model no. 60 is a 

 correct delineation. It is rare. "We have specimens of it from 

 the Crag of Suffolk. A somewhat similar, but really Nodosa- 

 rine, form occurs not unfrequently in the Mediterranean area, 

 both fossil and recent ; off Syra (90 fathoms) ; and fossil, from 

 Tertiary clays near Malaga. 



Model no. 61. Polymorphina {Guttulina) Problema, D^Orb. 

 Page 266, no. 14. 



Hab. Fossil, Castel-Arquato, Italy. PI. II. fig. 50. 



A many-chambered Polymorphina, somewhat irregular in the 

 disposition of the segments, which are long and distinct, and 

 do not overlap each other to the extent that is seen in most 

 members of the genus. 



