1170 THE VOYAGE OF H.M.S. CHALLENGER. 



lamellar or lanceolate feet, which are twice to three times as long as the shell, parallel and vertical. 

 (Very similar to PeMospijris Jlaldhcm, &c., Ehrenberg, 1875, he. ciL, Taf. xxii. figs. 6-8, but without 

 any trace of sagittal ring or columella.) 



Dimensions. — Shell 0'05 to O'OS diameter, feet 0'15 to 0'25 long. 



Habitat. — Central Pacific, Stations 2G6 to 268, depth 2700 to 2900 fathoms. 



Subgenus 2. EcTiinocalpis, Haeckel, 1881, Prodromus, p. 427. 



Definition. — Shell spiny, covered with numerous spines or thorns (besides the 

 feet and the apical horn). 



G. Halicalyptra spinosa, n. sp. 



Shell spiny, ovate, inflate in the apical half. Pores irregular polygonal, four to eight times as 

 broad as the bars. Peristome constricted, half as broad as the shell, with nine slender divergent 

 feet, which like the apical horn are curved, twice to three times as long as the shell and five to ten 

 times as long as the numerous bristles of the surface. 



Dimensions.— ^\iQ[i 0'08 long, 0'06 broad ; feet 0'15 to 0'25 long. 



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



7. Halicalyptra castanella, n. sp. 



Shell spiny, nearly spherical. Pores irregular roiindish. Peristome constricted, scarcely one- 

 third as broad as the shell, with twelve to twenty slender, widely divergent feet, which like the 

 horn are irregularly curved, and longer than the shell. (Very similar to certain forms of the 

 Phseodarium Castanella, PL 113, fig. 2.) 



Dimensions. — Shell 0'13 diameter, feet 0"15 to 0'18 long. 



Habitat. — Central Pacific, Station 272, depth 2600 fathoms. 



Genus 520. Carpocanistrum,^ n. gen. 



Definition. — Ar ch iph ormid a (vel Monocyrtida multiradiata aperta) without 

 radial ribs in the wall of the campanulate or ovate shell. Mouth with a corona of 

 radial feet. Apex without horn. 



The genus Carpocanistrum differs from the similar preceding Halicaly2itra in the 

 loss of the apical h(.)rn. It is very nearly related to the Dicyrtid Carpocanium and 

 may be easily confounded with it. But in the latter the uppermost part of the shell- 

 cavity includes a rudimentary cephalis with a cortinar septum, whilst in Carpocanistrum ' 



' Ciirpocanistrum = Sinia\l fruit-basket ; xajTo';, xauiar'^ov. 



