142 GOES, RETICULARIAN RHIZOPODA OF THE CARIBBEAN SEA. 



formity with that form of Glohigerina, previously mentioned, I still provisionally and 

 until further evidence has been adduced, place this form under Lituolina. 



The shell is very thin, but firmly constructed of polished uniform grains of sand, 

 rendering its surface in comparison with other sandstructures smooth and neat, and 

 the septal Ii nes nearly as distinct as in Glohigerina buUoides. 



It is not frequent, but occurs both in the coralline-gravel and chalk-ooze. 



Fig. 424: outer form. 



Fig. 425: Longitudinal section through the medial plane. 



Syn. Lituola nautiloidea var. globigerinseformis P.^rk. et Jones, 1865, North. Atl. anrl Aret. Oc; 



Phil. Transact. 155, 1, p. 407, t. 15, figg. 46—47; t. 17, figg. 

 96—98. 

 » » Wallich, 1862, N. Atl. seabed. t. 6, figg. 22. 



? » glomerata Br.vdy, 1879, Retic. and Rad. of the Arctic Exp. 1875—76; A. N. H. (5) 1, 



p. 433, t. 20, figg. 1 a— c. 

 Haplophragmium globigerinseforme Biiady 1882. Österr. Ung. Exped.; Wien. Ak. Dkschr. 43. 2, p. 100. 



Hyperammina elongata Brady. 



Tab. XII, ligg. 426—429. 



The generic separation of this form from the closely allied Rhabdammina linearis 

 Bråd. and Rh. abyssorum Särs. seenis uncalled for, and not quite appropriate from a 

 systematical and biological point of view; for it is likely that Hyperammina should be 

 regarded as a single-armed Rhabdammina. I still keep these forms asunder until 

 further evidence of their unity may be produced. 



Our form is usually a long, slender, seldom quite straight tube, constructed of 

 siliceous sand and a large portion of sponge-needles, very brittle and with mode- 

 rately thick walls. Sometimes it becomes so enlarged in the transverse direction as to 

 approach a produced ovoid form. 



It reaches a length of 15 mm. and is met with on the coralline-gravel and in 

 the chalk-ooze. 



Fig. 426 : The common form of a halfgrown specimen. 



Fig. 427 : The same cut open. 



Fig. 428: Aperture. 



Fig. 429: Ovoidal form. 



Svii. Hyperamraina elongata Brady, 1879, Retic. and Radiol. of the Arctic Exp. 1875 — 76; A. M. N. H. 



(5) 1, p. 4o3, t. 20, figg. 2a, b.; A. M. N. H. (5) 1. p. 425, t. 



20, f. 2. 



Appendix. 



Syn. Hyperammina ramosa Brady, 1879, Ilctic. Khizopod. Chalienger-Exped.; Q.u. Journ. micr. se 73, 



p. 33, t. 3, iigg. 14—15. 



