1056 THE VOYAGE OF H.M.S. CHALLENGER. 



2. Zygospyris equus, n. sp. (PI. 83, fig. 16). 



Shell subspherical, rough, with slight sagittal stricture. Pores small and numerous, subregular 

 circular ; no larger annular pores. Apical horn cylindrical, half as long as the shell. Two pectoral 

 feet somewhat smaller than the two tergal feet, about as long as the shell, slightly divergent, 

 cylindrical. The distal ends of the feet and of the horn form an ovate, dimpled and spinulate cone. 



Dimensions. — Shell 0'06 long, 0-09 broad ; horn 0'04 long, feet 0'06 long. 



Habitat. — Tropical Atlantic, Station 347, depth 2250 fathoms. 



Genus 460. Elaphospyris,^ Haeckel, 1881, Prodromus, p. 442. 



Definition. — Z y g o s p 3^ r i d a with two pairs of lateral feet and three coryphal horns. 



The genus Elaphospyris differs from the preceding Zygospyris, its ancestral form, in 

 the possession of three coryphal horns (one odd apical and two paired frontal horns), and 

 therefore bears to it the same relation that Triceraspyris does to Tripospyris among 

 the Tripospyrida. 



Subgenus 1. Giraffospyris, Haeckel, 1881, Prodromus, p. 442. 

 Definition. — Feet simple, not branched nor forked. 



1. JSlaphos^yyris heptaceros, Haeckel. 



Ceratospyris lieptaceros, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 66, Taf. xx. 



fig. 2. 

 Giraffoqjyris hej^faceros, Haeckel, 1881, Prodromus, p. 442. 



Shell nut-shaped, tuberculate, with slight sagittal stricture and subregular circular pores. 

 Basal plate with four large pores. Apical horn small conical, shorter than the two curved lateral 

 horns, which are as long as the shell. Caudal and sternal feet small, conical, straight. Two 

 pectoral feet slender, divergent, S-shaped, about as long as the shell. 



Dimensioiis. — Shell 0'05 long, 0'07 broad; horns and feet 0'02 to O^OOS long. 



Habitat. — Fossil in Barbados. 



2. Elaphosp>yris capricornis, n. sp. 



Shell nut-shaped, spiny, with slight sagittal stricture and numerous small circular pores. 

 Basal plate with four large pores. Three horns slender, simple, about as long as the shell, the 

 middle one straight, the two lateral curved. Four feet of nearly equal size, slender, curved, divergent, 

 simple, twice as long as the shell and the horns. 



Dimensions. — Shell 0-07 long, 009 broad ; horns O'OS long, feet 015 long. 



Habitat. — Central Pacific, Station 274, depth 2750 fathoms. 



^ .Eia^jAos^J^m = Deer-basket ; iTicKpos, u'tiv^I;. 



