1092 



THE VOYAGE OF H.M.S. CHALLENGER. 



Synopsis of the Genera of Androspyrida. 



I. Subfamily 



Lamprospyrida. 

 Three free basal feet. 



( Lattice-work simple, not 

 spongy. 



II. Subfamily 



Perispyrida. 



No free basal feet. Shell 

 three-jointed. 



III. Subfamily 



Nephrospyrida. 

 No free basal feet. Shell 

 spherical or discoidal. 



Lattice-work wholly 

 partly spongy. 



or 



Shell with two transverse 

 coronal strictures (one 

 superior mitral and one 

 inferior collar stricture). 



Apical horn usually simple, 

 not fenestrated, 



{Apical horn usually branched 

 and fenestrated, . 



Lattice-work only complete in 

 the frontal ring, 



Lattice-work complete on all 

 sides, 



[ Lattice- work double orspongy, 



1 Shell spherical orsubspherical, 

 . 

 Shell discoidal, kidney-shaped 

 or subcircular, 



479. Androspyris. 



480. Lamprospyris. 



481. AmpTiispyris. 



482. Tricolospyris. 



483. Perispyris. 



484. Sphcurospyris. 



485. Nephrospyris. 



Subfamily 1. LAMPROSPYRIDA, Haeckel. 



Definition. A ndrospyrida with three free basal feet {an odd posterior caudal 

 foot and two paired anterior pectoral feet). 



Genus 479. Androspyris, 1 n. gen. 



Definition. A ndrospyrida with three free basal feet and a simple apical horn ; 

 lattice- work of the three-jointed shell simple, not spongy. 



The genus Androspyris is probably the most original form of the Androspyrida, and 

 represents, together with the following Lamprospyris, the subfamily of Lamprospyrida, 

 which always possess three free basal feet, an odd posterior or caudal foot, and two 

 paired anterior or pectoral feet. It may be derived either from Acrospyris by develop- 

 ment of a cupola, or from Tholospyris by development of a thorax ; the common ancestral 

 form of these three typical genera is, no doubt, Tripospyris. Some species of 

 Androspyris reach a considerable size and are distinguished by a peculiar external form 

 resembling somewhat a human figure. 



1. Androspyris homunculus, n. sp. 



Shell thorny, with two deep transverse constrictions and irregular polygonal pores. Galea 

 subspherical, with a strong pyramidal oblique horn, about two-thirds as large as the cephalis, which 

 has the form of a human thorax, includes a strong ovate sagittal ring, and bears on each side a 

 stronger lateral spine. Thorax short and broad, prolonged into three latticed divergent feet ; the 



1 Androspyris = Man-like wicker basket ; **>}{, e 



