228 



UNITED STATES NATIONAL MUSEUM BULLETIN 215 



base must be referred to another genus. Many have 

 radial walls and probably belong to the Biiliminidae. 

 The Recent species figured and discussed by Hofker 

 (1951, p. 268) as Cassidella sguammosa (d'Orbigny) is 

 not conspecific and probably not congeneric with true 

 V. sguammosa, as he states that the walls are opaque. 

 In typical V. sguammosa the wall is hyaline, as was 

 mentioned by d'Orbigny. 



Types and occurrence: The type species, Bolivina 

 tortuosa Brady, is a very common species in the Indo- 

 Pacific area. Figured hypotypes (USNM P4857a,b) 

 are from the Eecent, near Nairai, Fiji. 



Family Spirillinidae Reuss, 1861 

 Sejunctella Loeblich and Tappan, new genus 



Type species: Sejunctella earlandi Loeblich and 

 Tappan, new species. (Derivation: Sejugo, sejunclus, 

 L., disunited, separated + ella, L., diminutive; gender 

 feminine.) 



Test free, planispiral, discoidal, and may have a 

 peripheral keel; globular to ovate proloculus followed 

 by loosely wound, spiral, undivided, tubular second 

 chamber that does not lie in contact with the previous 

 whorl but is separated from it by a solid platelike area; 

 wall calcareous, finely perforate, chamber wall and 

 peripheral keel, when present, formed of a single crystal 

 of calcite, but the intercalary plate between coils of 

 the tubular chamber is composed not of a single crystal 

 but of secondary granuJar calcite; aperture a rounded 

 opening at the end of the tubular chamber. 



Remarks: Sejunctella differs from Spirillina Ehren- 

 berg in the presence of the platelike intercalation 

 between the planispiral whorls, a condition considered 

 to be generically important, not only on external 

 appearance but also because it differs in structure, 

 being composed of granular calcite instead of a single 

 crystal as is the remainder of the test. The type 

 species has a peripheral keel on the final whorl, but 

 this may be lacking in other species. 



Spirillina lateseptata Terquem, 1875, from the Recent 

 beach at Dunkerque, Dept. du Nord, France, and 

 S. vivipara var. carinaia Halkyard, 1889, from Recent 

 dredging at ZYi to 5 fathoms, St. Brelade's Bay, Jersey, 

 Channel Islands, also belong to this genus. 



Sejunctella earlandi Loeblich and Tappan, new species 



Plate 73, FiorRE 6 



SpiriUina lateseptata Terquem Cushman (not Terquem, 1875), 

 U. S. Nat. Mus. BuU. 104, pt. 8, p. 6, pi. 1, figs. 13a,b (not 

 figs. 12a,b), pi. 2, fig. 1, 1931. 



Test free, planispiral, discoidal, or sometimes more 

 flattened on one side or even planoconcave, with finely 

 fimbriate peripheral keel; globular to ovate proloculus, 

 followed by loosely wound, spiral, imdivided, tubular 

 second chamber of about three to three and a half 

 whorls separated from each other by a solid platelike 

 area; wall calcareous, finely perforate, chamber walls 

 and peripheral keel formed of a single crystal of calcite. 



but the intercalary plate between coils of the tubular 

 chamber is composed of granular calcite; aperture a 

 rounded opening at the end of the tubular chamber on 

 the periphery. 



Greatest diameter of holotype 0.23 mm., least diam- 

 eter 0.18 mm. Paratypes range from 0.21 to 0.39 mm. 

 in greatest diameter. 



Remarks: This species was included by Cushman 

 (1931, p. 6) in SpiriUina lateseptata Terquem, but 

 diflfers in being about one-half to one-third as large, and 

 in the presence of a peripheral finabriate keel, as S. 

 lateseptata has a smoothly roxmded periphery and only 

 the intercalated plate between whorls. S. vivipara 

 var. carinata Halkyard is much larger than the present 

 species. 



The specific name is given in honor of Arthur Earland 

 in recognition of his excellent works on the Recent 

 Foraminifera. 



Types and occurrence: Holotype (USNM P3294) 

 and unfigured paratypes (USNM P3295) from F. C. 

 Goldseeker Station 16, lat. 62° N., long. 6°12' W., oft 

 Faroe Islands at 128 meters. Unfigured paratypes 

 (USNM P3297) from Porcupine Station 7, 3rd cruise 

 1870, lat. 48°18' N., long. 9°11' W., depth 93 fathoms, 

 and unfigured paratype (USNM P3296) from Belgium 

 station 1744, lat. 51°23' N., long. 3°15' E., depth 

 14.25 meters. 



Family Discorbidae Cushman, 1927 

 Eurycheilostoma LoebUch and Tappan, new genus 



Type species: Eurycheilostoma, altispira, new species. 

 (Derivation: eurys, Gr., broad, wide -|- cheilos, Gr. lip 

 -f- stoma, Gr., mouth; gender feminine.) 



Test free, trochospiral, high spired, aU chambers 

 visible from the high conical spiral side, only the final 

 whorl visible on the flattened to concave, deeply umbili- 

 cate, umbilical side, earliest whorl with four to six cham- 

 bers and may be reduced in well developed specimens 

 to three or four chambers per whorl, the last chamber 

 occupying one-half or more of the ventral side, extending 

 around both sides of the open umbilicus, the final whorl 

 of chambers may abruptly attain a greater diameter, 

 giving a flaring appearance to the test; sutures distinct, 

 depressed; waU calcareous, finely perforate, sin-face 

 smooth; apertm-e a broad arch at the inner margin of 

 the last chamber, opening into the umbilicus, and par- 

 tially covered by a broad lip, extending out over the 

 umbilicus from the final chamber, which may have a 

 serrate margin. 



Remarks: Eurycheilostoma, new genus, differs from 

 Discorbis Lamarck in the commonly high spired test, 

 the large final chamber, which occupies one-half or 

 more of the umbilical side, the absence of the alar 

 chamber flaps of Discorbis and the presence of a broad 

 serrate umbilical flap. 



It is closest to Neoconorbina Hofker, differing in 

 being high spired in character, rather than low and 

 scalelike, and in having a rounded periphery and sub- 



