626 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.56. 



DISCORBIS PILEOLUS (d'Orbigny.) 



VahuUna pileolus d'Orbigny, Foram. Amer. Mend., 1839, p. 47, pi. 1, figs. 15-17. 

 Discorhina piltolus Parker and Jones, Philos. Trans., vol. 155, 1865, p. 385. 



There are very numerous specimens of this species, most of which 

 are plastogamic — a condition which appears to be common in this 

 species. Most of the records for this species seem to be from the 

 Indian and South Pacific Oceans. There is one specimen which has 

 a border with a row of short spines which suggests a varietal char- 

 acter, but no name is given it as only one specimen occurs. 



DISCORBIS BICONCAVA (Parker and Jones.) 



Discorbina biconcava Parker and Jones, Philos. Trans., vol. 155, 1865, p. 422, 

 pi. 19, fig. 10.— H. B. Brady, Rep. Voy. Challenger, Zoologj', vol. 9, 1884, 

 p. 653. — SiDEBOTTOM, Johtd. Roy. Micr. Soc, 1918, p. 255. 



There are six specimens on one of the slides, which agree very 

 closely with the Challenger figures, Ahnost all the records for this 

 species are about Australia, except one from Siddall, from Great 

 Britain. This is recorded as a very small form, and it may be 

 questionable as to its really being identical with this species, espe- 

 cially since Sidebottom records a single small specimen from off 

 Australia. Heron-Allen and Earland in their Clare Island Paper do 

 not record this species. 



DISCORBIS INCONSPICUA (H. B. Brady). 



Textularia inconspiaui H. B. Brady, Rep. Yoy. Challenger, Zoology, vol. 9, 

 1884, p. 357, pi. 42. figs. 6rt-c.— Millett, Journ. Roy. Micr. Soc, 1899, p. 557, 

 pi. 7, fig. 1.— Chapman, Trans. New. Zealand Instit., vol. 38, 1905, p. 86.— Cush- 

 MAN, Bull. 71, U. S. Nat. Mus., pt. 2. 1911, p. 18.— Heron- Allen and Earland, 

 Trans. Zool. Soc, vol. 20, 1915, p. 623, pi. 47, figs. 1-4. 



In the material from this station there are six specimens of this 

 species. These show the early chambers to be spiral; the walls are 

 very thin and translucent, and distinctly perforated. Millett has 

 already remarked that this species has certain characteristics, making 

 it more like some of the Rotahidae than the other species of Textularia, 

 and Brady also observed this same resemblance. I have already 

 noted (pt. 2, p. 19) that it might belong to Discorhis, but that ''a 

 study of the apical charactei-s and the arrangement of the early 

 chambers should determine this." This material now can be used 

 for this study, and seems to determine definitely that it should be 

 placed among the Rotaliidae. In some of its markings it resembles 

 Patellina, and is here placed under Discorhis. It seems to be a 

 species in which the chambers each make a half coil as added, and 

 its resemblance to Textularia is only superficial. This seems to be 

 clearly an Indo-Pacific species. The localities given by Brady are 

 off Moncoeur Island, Bass Strait, 38 fathoms; Nares Harbor, Admi- 



