12 BULLETIN 104, UNITED STATES NATIONAL MUSEUM. 



LAGENA COSTA TA (Williamson). 

 Plate 1, fig. 16 ; pi. 2, figs. 1, 2 ; pi. 3, fig. 8. 



Entosolenia costata Williamson, Rec. Foraiii. Great Britain, IS.jS, p. 9, 

 pi. 1, fig. 18. 



Lagena costata Reuss, Sitz. Akad. Wiss. Wien, vol. 46, pt. 1, 1862 (1863), 

 p. 329, pi. 4, fig. 54. — Balkwii.l and Wright, Proc. Roy. Irish Acad., 

 ser. 2, vol. 3, 1882, p. 547; Trans. Roy. Irish Acad., vol. 28, 1885, p. 

 338, pi. 14, figs. 3-5.— H. P.. Brady. .Ton in. Roy. ]\Iicr. Soc, 1887, p. 

 903. — Wright, Proc. Roy. Irish Acad., ser. 3, vol. 1. 1891, p. 479; Irish 

 Nat, vol. 9, No. 3, 1900, p. 53.— Millett, .Tonrn. Roy. Micr. Soc. 1901, 

 p. 7, pi. 1, fig. 8. — Wright, Irish Nat., vol. 11, 1902, p. 213. — SinKnoxTOM, 

 Journ. Quekett Micr. Club, vol. 11, 1912, p. 388, pi. 15, figs. 16-20.— 

 CusHMAN, Bull. 71, U. S. Nat. Mus., pt. 3, 1913, p. 21, pi. 9, fig. 6 ; pi. 

 10, fig. 1; pi. 12, fig. 1. — Heron-Allen and Earland, Proc. Roy. Irish 

 Acad., vol. 31, pt. 64, 1913, p. 75; Trans. Zool. Soc. London, a'oI. 20, 

 1915, p. 656; Trans. Linn. Soc. London, ser. 2, vol. 11, 1916. p. 243; 

 Journ. Roy. Micr. Soc, 1916, p. 45. 



DescHption. — Test subglobular, ornamented with a few rather 

 remote ribs or costae running nearly the length of the test, frequently 

 not reaching the apex, but ending in a ring of spinose projections; 

 aperture small and rounded ; costae most often rounded. 



Length 0.25-0.50 mm. 



Distribution. — Most of the references for this species are from the 

 region of the British Isles, where it is one of the most typical species, 

 especially off the Irish and Scottish coasts, where it is recorded at 

 numerous stations, especially by Heron- Allen and Earland. 1 have 

 failed to find typical specimens in the western Atlantic material I 

 have examined. 



LAGENA CRENATA Parker and Jones. 



Plate 2, figs. 3, 4. 



Lagena crcnata Parker and Jones, Philos. Trans., vol. 155, 1865, p. 420, pi. 

 18, figs. 4ff, 5. — Balkwill and Wright, Trans. Roy. Irish Acad., vol. 

 28, 1885, p. 339, pi. 14, figs. 17, 18.— H. B. Brady, Journ. Roy. Micr. 

 Soc, 1887, p. 904.-— AVright, Proc. Roy. Irish Acad., ser. 3, vol. 1, 1891, 

 p. 479. — Chapman, Journ. Linn. Soc. London, vol. 28, 1900, p. 246. — 

 Millett, Journ. Roy. Micr. Soc, 1901, p. 485, pi. 8, fig. 1. — Sidebottom, 

 Journ. Quekett Micr. Club, vol. 12, 1913. p. 174, pi. 15, fig. 28.— Heron- 

 Allen and Earland, Trans. Zool. Soc. London, vol. 20, 1915, p. 658. 



DescH'ption. — Test flask-shaped, with the base truncate, the base 

 at the edge crenulate. each of the crenulations marking a fold of the 

 base; the neck elongate, usually with a spiral ornamentation, the 

 remainder of the test smooth. 



Length 0.30-0.50 mm. 



Distribution. — This species was originally described by Parker and 

 Jones, off the coast of Australia. There are, however, several records 

 for it off the coast of the British Isles. It has not occurred in the 

 western Atlantip material. 



