Acros rida 



REPORT ON THE RADIOLARIA. 



Synopsis of the Genera of Phormospyrida. 



apical 



1085 



cros ra 



Three basal cortinar feet (one odd caudal [ N ical h 

 and two paired pectoral). 



II Subfamily 



Khodospynda. 



Numerous basal feet in a corona (nine to 

 twelve or more). 



De apical h rn ' " 

 Thfee .^ h 



No apical horn, . 



475. Phorm) spyris. 



476 ' Pata ff 08 Py. 

 477 _ Rhodospyris 



478. Desmospyris. 



Subfamily 1. ACROSPYRIDA, Haeckel, 1881, Prodromus, p. 441 (sensu emendato). 



Definition. P hormospyrida with three basal feet (an odd caudal and two 

 paired pectoral). 



Genus 474. Acrospyris, 1 Haeckel, 1881, Prodromus, p. 441. 

 Definition. P hormospyrida with three basal feet and one apical horn. 



The genus Acrospyris is probably the oldest and most primitive among the Phor- 

 mospyrida, perhaps the original ancestral form of this family. It has been derived 

 from Tripospyris by the development of lattice-work between the three basal feet, forming 

 a second joint or thorax. It has also therefore a close relation to the simplest forms of 

 the triradiate Dicyrtida: Dictyophimus, Clathrocanium, &c. It differs from these in 

 the distinct sagittal constriction of the cephalis, which divides it into two lateral loculi. 



1. Acrospyris clathrocanium, n. sp. (PL 95, fig. 17). 



Shell tuberculate, with distinct collar and deep sagittal stricture. Cephalis nut-shaped, with 

 numerous irregular, roundish pores ; three pairs of larger annular pores on each side of the ring. 

 Basal plate with four larger pores (two major cardinal and two minor jugular pores). Apical horn 

 slender, pyramidal, curved, about as long as the shell, with three recurved short spines. Thorax 

 three-sided, about twice as large as the cephalis, with three large basal holes and a broad riband 

 with numerous smaller holes ; three ribs between them stout, pyramidal, strongly curved, prolonged 

 into three convergent crescentic feet. 



Dimensions. Cephalis 0'08 long, Oil broad; thorax 014 long, 016 broad. 



Habitat. Central Pacific, Station 271, depth 2425 fathoms. 



2. Acrospyris dictyophimus, n. sp. 



Shell smooth. Cephalis and thorax of nearly the same structure and form as in the 

 preceding species ; it differs from the latter in the shape of the three stout basal feet, which are 



1 Acrospyris = Basket with an apical spine ; ?, aw^i's- 



