36 



BULLETIN 104, UNITED STATES NATIONAL MUSEUM 



Length, 0.75 mm.; breadth, 0.60 mm.; height, 0.25 mm. 



Holotype (Cushman Coll. No. 12924) from off the coast of Florida, 

 off'Fowey, 22 fathoms. 



The species is smoother than the two preceding ones, but is related 

 to them. It is comparatively broad. 



Lamarckina atlantica — Material examined 



LAMARCKINA HAUOTIDEA (Heron-Allen and Earland) 



Plate 7, figures 8, 9 



Pulvinulina haliotidea Heron-Allen and Earland, Journ. Roy. Micr. 

 Soc, 1911, p. 338, pi. 11, figs. 6-11; Proc. Roy. Irish Acad., vol. 31, pt. 

 64, 1913, p. 136; Journ. Roy. Micr. Soc, 1916, p. 51; Trans. Linn. Soc. 

 London, ser. 2, vol. 11, 1916, p. 276; British Antarctic Exped., Zoology, 

 voL 6, 1922, p. 215; Journ. Roy. Micr. Soc, 1930, p. 189. 



Test small, compressed, somewhat longer than broad, dorsal side 

 gently convex, ventral side flattened or concave, umbilicate, periphery 

 subacute; chambers distinct, usually five in the final whorl, the last 

 one in the adult much the longest and on the ventral side extending 

 backward in a large lobe; sutures distinct, only slightly curved, not 

 much depressed; wall smooth, ventral side polished; aperture on the 

 inner margin of the ventral side of the chamber. 



Length, 0.35 mm.; breadth, 0.25-0.28 mm.; height, 0.06 mm. 



This small but distinctive species seems to be well distributed on 

 the coast of western Europe. I have an excellent series from a 

 Goldseeker dredging off the Faroe Islands thanks to Earland. Very 

 typical specimens occur off the coast of Belgium. Heron-Allen and 

 Earland record it from Goldseeker stations from the Clare Island 

 region of Ireland, off South Cornwall, and west of Scotland. They 

 also record it from the Antarctic, but most of the specimens are 

 recorded of much greater size than those of European waters. 



Heron-Allen and Earland named this species on account of its 

 ear-like shape, a characteristic of the ventral side of most species of 

 Lamarckina. 



It may be noted here that d'Orbigny's ''Valvulina excavata" from 

 off the Canaries figured in that report (pi. 1, figs. 43-45) is probably 

 a Lamarckina. 



