1054 THE VOYAGE OF H.M.S. CHALLENGER. 



3. Aegospyris longibarba, Haeckel. 



Ceratospyris longibarba, Ehrenberg, 1875, AbhandL d. k. Akad. d. Wiss. Berlin, p. 66, Taf. xxi. 

 figs. 1, 2. 



Shell nut-shaped, tuberculate, with slight sagittal stricture. Pores subregular circular. Basal 

 plate with four larger central, and eight smaller peripheral pores. Apical horn and caudal foot 

 short, straight, conical ; two frontal horns longer, curved ; four paired feet slender, curved, twice as 

 long as the shell. 



Dimensions. Shell 0'06 long, O08 broad ; paired horns - 03 long, paired feet O'l long. 



Habitat. Fossil in Barbados. 



4. Aegospyris aegoceras, n. sp. (PL 95, fig. 10). 



Shell nut-shaped, tuberculate, with deep sagittal stricture. Pores irregular roundish. Basal 

 plate with three large pores. Apical horn and caudal foot short, straight, spindle-shaped ; two 

 frontal horns as long as the shell, strongly curved ; four paired feet also curved, at the distal end 

 forked, divergent ; the tergal thinner and as long as the shell, the pectoral thicker and twice as 

 long. 



Dimensions. Shell O07 long, 0'09 broad ; pectoral feet O'l long. 



Habitat. North Pacific, Station 244, depth 2900 fathoms. 



5. Aegospyris caprina, n. sp. (PL 86, fig. 8). 



Shell nut-shaped, papillate, with sharp sagittal stricture. Pores irregular roundish, two pairs of 

 larger pores on each side of the ring. Basal plate with six large pores. Eight spines all straight, 

 subvertical and nearly parallel, cylindro-conical. Two frontal horns and two tergal feet about as 

 long as the shell ; odd horn shorter ; odd foot longer. Two pectoral feet twice as long as the 

 shell, club-shaped, with a spinulate knob at the distal end. 



Dimensions. Shell 0'06 long, 0'09 broad ; pectoral feet O'll long. 



Habitat. Central Pacific, Station 271, surface. 



Genus 458. Pentaspyris, 1 Haeckel, 1881, Prodromus, p. 442. 

 Definition. Z ygospyrida with five basal feet, without apical horn. 



The genus Pentaspyris differs from the two preceding genera in the absence of any 

 coryphal horn, and represents therefore the pentapodal form among the hornless 

 Zygospyrida. 



1. Pentaspyris pentacantha, n. sp. (PL 95, fig. 11). 



Shell nut-shaped, tuberculate, with deep sagittal stricture. Pores irregular roundish, two pairs 

 of larger pores on each side of the ring. Basal plate with four larger pores. All five feet cylin- 



1 Pentaspyris = Basket with five feet ; riurti, 



