354 REPORT ON ALBATROSS MOLLUSCA DALL. 



extend beyond the first spiral, except on the last whorl, where they 

 disappear toward the periphery; these secondaries are elevated aud 

 sublamellose, very regularly spaced, aud re-appear on the base within 

 the two anterior spirals, then overrun the carina and ascend the umbil- 

 icus in a vertical direction ; whorls full aud rounded, except as modified 

 by the sculpture; surface polished; suture deep but not channeled; 

 apical part of the spire rather pointed ; base full, angulated at the 

 umbilicus, which is large and deep, with nearly vertical, scalar sides; 

 aperture wide, outer lip rounded, thin, sharp; base angulated by the 

 umbilical cariua, strictly continuous with the pillar and outer lip; pillar 

 thin, sharp, not reflected, a little concave above the middle, not any- 

 where thickened; body without callus; maximum diameter of shell, 0; 

 minimum diameter, 7.25; altitude, 7.25""". 



Hab. — Station 2751, south of St. Kitts, in 687 fathoms, ooze; Station 

 2754, east from Tobago, in 880 fathoms; and Station 2760, 90 miles 

 north of Ceara, in 1,019 fathoms, broken coral; temperatures 37°.9 to 

 39°.9 F. It has also been found at Guadalupe in 769 fathoms, sand. 



This is nearest *S'. cegleis Watson, which is more couical aud has a 

 different sculpture, aud especially a much more funicular umbilicus. 

 8. actinophora is a larger shell than S. (eyleis, aud attaius larger dimen- 

 sions thau are here given, judging from fragments among the dredgings. 



Genus BASILISSA Watson. 

 Basilissa alta Watson. 



Collected with the last species at Stations 2751, 2751, and 2760. 

 Family DELPHINULID^. 

 Genus LIOTIA Gray. 

 Liotia Riisii D linker. 



Collected at Station 2758, 90 miles southeast from Cape San Roque, 

 in 20 fathoms, shelly bottom. 



Family CYCLOSTREMATID^. 



Genus CYCLOSTREMA Marry at. 



Cyclostrema cistronium Dall. 



Plate xi, Fig. 11. 

 Cyclosirema cistronium Dall, Bull. Mus. Cornp. Zool, xvni, p. 394, June, 1839. 



Shell small, white, with a polished nucleus, one and a half rounded 

 and as many more carinated whorls; spire depressed; radiating sculpt- 

 ure of fine, close, tlexuous threads, which appear chiefly in the inter- 

 spaces of the spirals, giving the surface a minutely punctate appear- 

 ance; these extend over the whole surface except of the nuclear whorls; 

 spiral sculpture of, on the summit, seven or eight, between the carinas 

 six or eight, aud on the base ten or fifteen extremely fine threads, even 



