60 HALKYARD, Fossil Foraminifera of the Blue Marl 



The typical form with regular raised hexagonal reticulated 

 ornament is rare, and is found only in the upper half of the Marl. 

 In our collections, on the one hand it merges into L. melo, 

 d'Orb, and on the other the reticulation becomes irregular, the 

 meshes taking on a square, and also pentagonal form over a 

 large portion of the shell, so merging into L. reticulata (Mac- 

 gillivray.) 



(We do not see any evidence of affinity with L. melo in 

 Halkyard s specimens, which are all of a small type and 

 resembling Williamson's varieties scalariformis and catenulata.} 



120. Lagena reticulata (Macgillivray..) 



Lagenula reticulata, Macgillivray, 1843, Hist. Moll. Anim. 



Aberdeen, etc., p. 38- 

 Lagena squamosa, P. J. & B., 1865, Foram. of the Crag, pt. I. 



p. 39, pi. IV, fig. 7. 

 L. reticulata, T. R. Jones, 1895, Foram. of the Crag, pt. II. 



P- 195- 



This species is more frequent than the last named, and is 

 distinguished by the irregular reticulation of its surface orna- 

 mentation. As regards the size of the test and reticulation, 

 as well as in form, there is no difference between the two species 

 in the Biarritz examples. 



(The majority of specimens should, we think, be referred to 

 L. hexagona (Will.).) 



121. Lagena melo (d'Orbigny.) 



Oolina melo, d'Orbigny, 1839, Voy. Amer. Merid. vol. V, pt. 5_ 

 "Foraminiferes," p. 20, pi. V, fig". 9. 

 Very rare and small. 



(The specimens must be referred to L. hexagona (Will.). 

 They are quite unlike d'Orbigny's type, which is of very rare 

 occurrence, and in which the transverse costae are set regularly 

 in parallel bars across the longitudinal sulci.) 



122. Lagena laevigata (Reuss.) 



Fissurina laevigata, Reuss, 1850, Denkschr. k. Ak. Wiss. Wien.. 



vol. 1, p. 366, pi. XLVI, fig. 1. 

 Lagena laevigata, Brady, 1884, Chall. Rep., p. 473, p. CXIV,. 



figs. 8a, b. 



Small and very rare. 



