138 GOÉS, RETICULARIAN RHIZOPODA OF THE CARIBBEAN SEA. 



or precipitation by the aniuial. Young specimens have a firmer construction with a 

 great many sponge-needles entering into the building-materials, rendering its surface 

 quite bristly. The earliest stage seems to be of the same slender form as in the pre- 

 ceding. The septal impressions are very indistinct; the aperture does not exhibit that 

 decided seuiilunar form as the preceding, being rounder or of undecided form, owing 

 to the looseness and coarsness of the texture. The chambers are on their inside lined 

 throughout with bright rust-coloured reddish sand. 



It is not common either on the chalk or in the coralline-gravel, attainiug 10 mm. 

 in length and about 3 mm. in diameter. 



Fig. 410: Lit. scorpiurus var. ammophila. 

 Fig. 411: Section through the median plane. 

 Fig. 412: apertural end. 

 Figg. 413 — 414: young individuals. 



Lituolina foedissima Reuss. 



Tab. XII, figg. 415—418. 



Notwithstanding the more compact and homogeneous texture of this form than 

 the foregoing and its striking difference I am not quite convinced of its specific dis- 

 tinctness from Lit. scorpiurus. It is no doubt identical with Reuss' species from the 

 cretaceous formation, although his form is stated to be furnished with subdivided 

 chambers, on which character he has based his new genus: Haplosticlie. 



The surface is very rough, but still the shell is agglutinated of line chalk-par- 

 ticles and probably also a great deal of precipitated or secreted carbonate of lime. The 

 chambers are somewhat roughly sketched out, often very irregular in size and shape, 

 with impressed and quite distinct septal lines. The aperture is semilunar, often fur- 

 nished with a small tongue. 



It oceurs chiefly in the coralline-gravel and grows to a length of 8 mm. 



Fig. 415: Stout form, with sudden increase of the size of the chambers. 



Fig. 416: A longitudinal section of the same. 



Fig. 417: More pointed form. 



Fig. 418: The aperture furnished with a tongue. 



Syn. Dentalina foedissima Rss., 1859, Kreidef. Westplial.; Wien. Ak. Sitz.-Bev. 40, p. 189, t. 3, figg. 



2—3. 

 Haplostiche » Ess., Geinitz' Elbthalgeb. Sachs., 1873, 2, p. 121, t. II. 24, figg. 1—3. 



» » Fnics' Modell. 2. 



PNodosaria constrieta Rss., 1845, Böhni. Kreide. 1, p. 26, t. 13, figg. 12 — 13. 



PHaplostiche » Rss., 1873, Geinitz Elbthalgeb. Sachs. 2, p. 122, t. II. 24, figg. 9—12. 



» dentalinoides, elavulina Rss., ibid. p. 121, t. II. 24, figg. 4 — 8. 



» horrida Schwag., 1863, Jnrass. Sch.; WUrtemb. nat. Yerein. Jhrhft. 21, t. 2, fig, 2. 



(an Lit. scorpiurus var.). 



