140 BULLETIN 104:, UNITED STATES NATIONAL MUSEUM. 



of 100-500 fathoms (183-914 meters). Frondicularia advena is 

 found ill deeper waters and is rather widely distributed. There 

 are several species which have been referred to this genus in 

 recent years which possibly should not be placed here. They are 

 small, thin-walled species, described from the Mediterranean or the 

 eastern ; North Atlantic, in which there is a compressed form, but 

 the typical inverted V-shaped chamber is not characteristically de- 

 veloped. These species, moreover, instead of having the typical 

 radiate aperture characteristic of Frondicularia^ more often have 

 a small aperture, and it seems that they should be studied to see 

 whether or not they really belong to this genus. 



FRONDICULARIA [?] TRANSLUCENS Heron-Allen and Earland. 



Plate 21, fig. 4. 



Frondicularia translucens Heron-Allen and Eabland, Proc. Roy. Irish 

 Acad., vol. 31, pt. 64, 1913, p. 96, pi. 8, fig. 13. 



Deso'iption. — " Test minute, ovate, compressed, rounded at both 

 ends, and at the marginal edges, showing 3-4 chambers. The initial 

 chamber large, inflated, lenticular in shape. Sutural lines somewhat 

 obscure, especially in the later chambers. Shell walls transparent; 

 surface minutely punctate; aperture a slit furnished with a curved 

 entosolenian tube. 



" Length 0.1^0.16 mm. ; breadth 0.10-0.12 mm." 



Distribution. — This species was described by the authors from 

 Inishgoula Harbor, Ireland, in 14 fathoms. 



It seems questionable whether this should be referred to Frondi- 

 cularia or not. 



FRONDICULARIA [?1 SIDEBOTTOMI, new name. 



Plate 21, fig. 6. 



Frondicularia spathulata Sidebottom (not Williamson), Mem. Proc. Man- 

 chester Lit. Philos. Soc, vol. 51, 1907, p. 5, pi. 1, fig. 26. — Heron-Allen 

 and Earland, Proc. Roy. Irish Acad., vol. 31, pt. 64, 1913, p. 97, pi. 8, 

 fig. 12 ; Trans. Linn. Soc. London, ser. 2, vol. 11, 1916, p. 260. 



Description. — Test minute, hyaline, compressed, periphery 

 rounded, lobulate ; chambers in a straight axis, increasing in breadth 

 as added ; sutures distinct, slightly depressed ; wall smooth ; aperture 

 simple, elliptical, often with an entosolenian neck. 



Length of British specimens 0.20-0.35 mm. 



Distrihution. — Heron-Allen and Earland record this from five 

 stations in the Clare Island region of Ireland in muddy localities. 

 They also note its occurrence in the muddier dredgings from 

 shallow water around the north and west coasts of Scotland and in 

 the North Sea. Sidebottom figured the species from the coast of 

 the Island of Delos. He referred to the same species a specimen 



