Page:Scientific results HMS Challenger vol 18 part 2.djvu/216

Synopsis of the Genera of Androspyrida.

I. Subfamily Lamprospyrida. Three free basal feet.	$\scriptstyle {\left\{{\begin{matrix}\ \\\\\ \ \end{matrix}}\right.}$	Lattice-work simple, not spongy.	$\scriptstyle {\left\{{\begin{matrix}\ \\\ \end{matrix}}\right.}$	Apical horn usually simple, not fenestrated,	479. Androspyris.
		Lattice-work wholly or partly spongy.	$\scriptstyle {\left\{{\begin{matrix}\ \\\ \end{matrix}}\right.}$	Apical horn usually branched and fenestrated,	480. Lamprospyris.
II. Subfamily Perispyrida. No free basal feet. Shell three-jointed.	$\scriptstyle {\left\{{\begin{matrix}\ \\\\\ \ \end{matrix}}\right.}$	Shell with two transverse coronal strictures (one superior mitral and one inferior collar stricture).	$\scriptstyle {\left\{{\begin{matrix}\ \\\\\ \\\ \ \end{matrix}}\right.}$	Lattice-work only complete in the frontal ring,	481. Amphispyris.
				Lattice-work complete on all sides,	482. Tricolospyris.
				Lattice-work double or spongy,	483. Perispyris.
III. Subfamily Nephrospyrida. No free basal feet. Shell spherical or discoidal.	$\scriptstyle {\left.{\begin{matrix}\ \\\\\ \ \end{matrix}}\right\}\,}$	Shell without external transverse stricture.	$\scriptstyle {\left\{{\begin{matrix}\ \\\\\ \ \end{matrix}}\right.}$	Shell spherical or subspherical,	484. Sphærospyris.
				Shell discoidal, kidney-shaped or subcircular,	485. Nephrospyris.

Subfamily 1. Lamprospyrida, Haeckel.

Definition.—Androspyrida with three free basal feet (an odd posterior caudal foot and two paired anterior pectoral feet).

Genus 479. Androspyris,^[1] n. gen.

Definition.—Androspyrida 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 development 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; ἀνήρ, σπυρίς.