REPORT ON THE RADIOJ.ARIA. oo'S 



4. Xij)/i((tiuctns .-iulcatus, Haeckel. 



SfylospJiwm sulcata, Elirenberg, 1875, Abhandl. J. k. Akail. d. Wiss. Berlin, p. 84, Taf. xxiv. 



Cortical shell lliick wullcil, witli thorny surface, and regular, circular pores, quite as broad as 

 the bars; nine to ten on the half equator. Polar spines cylindrical, with longitudinal basal furrows 

 and conical apex, three times as broad as the pores; the larger about as long as the main axis, the 

 shorter only one-half or two-thirds as long. 



Dimensions. — Major axis O'O] , niinoi- (l-(J8; pores and liars O'OOT; main axes of the two medullary 

 shells O'OS and 0"04; length of the major polar spine O'l, of the minor O'OG, breadtli of them 0'02. 



Habitat. — Fossil in the Barliados deposits. 



5. Xiphat)X(ctus da.'ii/pn.s, n. sp. 



Cortical shell thick walled, with spiny surface, and regular, elegant network; pores circular, 

 hexagonally framed, about as broad as the bars; from every corner of the network (between three 

 pores) arises a short bristle-like spine. Polar spines three-sided prismatic, as broad as one 

 hexagon; the major once to twice as long as the main axis, the minor only one-half to one-fourth 

 as long. (The cortical shell much resembles Mlipso.viphus elegans, PI. 14, fig. 7.) 



DiTnensions. — Major axis 0*15, minor O^lo; pores and bars 0M)1 ; main axes of the two medullary 

 .shells ()•! and (l-()G; length of the major polar spine O'l to O'o, of tiif minor 0-()."i to (VI, thickness 

 O-Ol. 



Habitat. — Tropical Western Pacific, Station 222, surface. 



Subgenus 3. XiphatraLtona, Haeckel. 



Dejinition. — Network of the cortical shell irregular, with meshes of different size or 

 form ; .surface smooth, without thorns or papillae. 



(i. XiphatvactuA cldamijdophora.^, n. .sp. 



Cortical shell thin walled, smooth, with irregular, roundisli pores, twice to four times as broad as 

 tlie bars ; eight to twelve on the half equator. I'olar spuies angular, irregularly curved or contorted ; 

 the larger once to twice as long as the main axis, the shorter and thicker pommel-shaped, only 

 I me-third to one-half as long ; their basal breadth equals two pores. 



Dimensions. — Major axis (J'14, minor Ol ; pores ()'(306 to fl-012, bars ()-()0."> ; main axis of the 

 two ellipsoidal medullary shells O'OO and i)M)4: lengtli of tlie major jiolar spine (il to 0'2, of the 

 minor O'Oo to 0-08, breadth 0-02. 



Haliital. — Cosmopolitan ; Atlantic, Pacific, many Stations, surface. 



