98 BULLETIN 104, UNITED STATES NATIONAL MUSEUM. 



spines; suture distinct, not depressed; wall smooth; aperture elon- 

 gate with an entosolenian tube. 



Length 0.08-0.10 mm. 



DistHhution. — Sidebottom originally described this minute species 

 from the Mediterranean, off the coast of the Island of Delos, and 

 Heron- Allen and Earland have recorded it from the Clare Island 

 region as well as the following: Goldseeker dredgings from Noss 

 Head (Moray Firth), Scapa Flow (Orkney Islands), and in the 

 Minch. 



This is a peculiar little species and seems almost like a young form 

 of a larger species. The finding of it by Heron-Allen and Earland 

 at numerous stations off the British Isles seems to show that it is 

 a valid species with these peculiar characters. It has not occurred 

 in the western Atlantic as far as I have seen. 



LINGULINA PELLUCIDA Sidebottom. 



Plate 17, fig. 10. 



LinguUna pellucida Sidebottom, Mem. Proc. Manchester Lit. Philos. See, 

 vol. 51, No. 9, 1907, p. 4, pi. 1, figs. 22-25 ; vol. 54, 1910, p. 20.— Heron- 

 Allen and Earland, Proc. Roy. Irish Acad., vol. 31, pt. 64, 1913, p. 

 96, pi. 8, fig. 10 ; Journ. Roy. Micr. Soc, 1916, p. 47. — Sidebottom, 

 Journ. Roy. Micr. Soc, 1918, p. 136. 



Description. — Test longer than broad, compressed, especially in the 

 later chambers, periphery rounded in transverse section; composed 

 of 2 or 3 chambers, earlier one subglobular, the second and third 

 much more compressed, the initial chamber oval, the second some- 

 what embracing and broader than the first, with a spine from each 

 of the posterior angles of the periphery; chamber three may be of 

 the same form or may be remote, with a short neck, with or without 

 a spine developed in the second chamber ; sutures distinct, depressed ; 

 wall smooth and finely punctate; aperture elliptical, at the end of a 

 definite neck, with a phialine lip. 



Length, 0.15-0.25 mm. 



Distribution.- — Sidebottom originally described this species from 

 the Mediterranean, it being common off the Island of Delos in the 

 Aegean Sea, and rare at the Bay of Palermo, Sicily. Heron-Allen 

 and Earland have recorded typical specimens from off the coasts of 

 the British Isles, in the Clare Island region, off Noss Head in the 

 Moray Firth, and off the coast of South Cornwall. Sidebottom also 

 records two specimens from the eastern coast of Australia in 465 

 fathoms (850 meters). 



This is another of the species which has not occurred, so far as I 

 have seen, in the western Atlantic. The elongate, tubular aperture, 

 with a phialine lip, makes the species very different from typical 

 LinguUna. 



