50 GOES, RETICULARIAN RHIZOPODA OF THE CARIBBEAN SEA. 



Fig. 52 is a mixed form from Nod. calcar and Nod. legumen. It has been fa- 

 voured with many names, as Cristellaria Hildesiensis ROM.; Crist. Saulcyi D'()RB., Crist. 

 Marcki Rss., Crist, inflata Rss. etc. 



Fig. 53 represents a peculiar monstrosity; a full-formed Nod. calcar turning 

 back into Nod. legumen. 



Figg. 54 56 are D'ORBIGNY'S RobuHna aculeata of 1826 and his Rob. calcar of 

 1846. The larger one is from the chalk-bottom, the smaller from the coralline-gravel. 



Figg. 57 59 has been named Crist, inornata, austriaca D'ORB., Crist, tangential/,* 

 Rss. etc. It is provided with a very thin and broad wing or keel arid could also be 

 referred to Crist, cultrata MONTF. ; but this appendage is met with throughout all the 

 varieties and is not peculiar to any of them. From the chalk-bottom. 



Figg. 60 61 are monstrosities with luxuriant alar- and umbilical processes. 

 From coralline-gravel. 



The regular, typical form, rotulata LMK., is the most abundant arid the stoutest 

 of all our forms (3 5 mm.). 



a) Inevis: 



Nautilus laevigatulus MONTAGU, 1803, Test. Brit. p. 188; 1808: Suppl. p. 75, t. 18, figg. 7 8 

 Lenticulites Comptoni NILSSON, 1825, MSngruramiga snackor i kritforraat. i Sverige; K. Vet. Ak. 



Handl. 1825, p. 337; 1827, Petref. svecana p. 7, t. 2, fig. 3. 



Cristell. rotulata D'ORB., 1839, For. craie bl.; Mem. Soc. geol. Pr. 4, p. 26, t. 2, figg. 1518. 



REUSS, 1845, Bohm. Kreide 1, p. 34, t. 8, fig. 50 ; t. 12, fig. 25; t. 24, fig-;. 



4849. 

 PARK, and JONES, 1865, N. Atl. and Arct. Oc. ; Phil. Trans. 1. 55. 1, p. 345, 



t. 13, fig. 19. 



simplex D'ORB., 1846, For. tert. Vienne, p. 103. t. 4, figg. 27 28. 



calcar PARK, and JONES, 1857, For. Coast, of Norway; Ann. Mag. Nat. Hist. (2), 



19, p. 289. 



Rob. canariensis D'ORB., 1844, lies Canaries, p. 127, t. 3, figg. 3 4. 



Cristell. polita SCHWAG., 1866, For. Kar-Nikobar; Novara Reise, geol. Th. 2. 2, p. 242, 



t. 6, fig. 86. 



Bob. plicata D'ORB., 1826, Tab. meth.; An. Sn. N. p. 290, N:o 23. 



Cristell. multiseptata Rss., 1865, For. deutsch. Sept. Thon; Wien. Ak. Dkschr. 1. 25. 1, p. 147, 



t. 3, figg. 1415. 

 Bob. ueglecta Rss., 1851, Sept. Thon Berlin; Zeitschr. deutsch. geol. Ges. 3, p. 69, t. 4, 



fig. 27. 

 stellifera GZJZ., 1847, For. Wien. Beck.; Haicl. Nat. Abh. 2. i, p. 142, t. 12, figg. 



2627. 

 diinorpha, incompta Hss., 1851, Sept. Thon v. Berlin; Zeitschr. deutsch. geol. Ges. 3, p. 67, 70, 



figg. 23, 28. 

 Cristell. macrodisca Rss., 1862, Nordd. Hils u. Gault, Wien. Ak. Sitz.-Ber. 1. 46, p. 78, t. 9, 



fig. 5. 

 Cristell. paupercula Rss., 1865, deutsch. Sept. Thon; Wien. Ak. Dkschr. 1. 25. 1, p. 141, t. 3, 



figg. 67. 

 Bob. Gottingensis, nautiloides BORNEM., 1854, Liasforra. Gottingen p. 43, t. 4, figg. 4042. 



Bob. trigonostoma, declivis BORNEM., 1855, Sept. Thon Hermsdorf; Ztschr. deutsch. geol. Ges. 7, p. 



333336, t. 15, figg. 811. 



