780 PROF. A. BENDY AND MR. R. W. H. ROW ON 



2. T. viLLOSA Carter. Type species of the genus, 

 Trichogypsia'villosa Carter [1871 B]. 

 Leucyssa incrustans var. villosa Haeckel [1872]. 



It is doubtful whether Haeckel's Sycolevis incrustans is really 

 a synonym of TricJtogypsia villosa or of T. incrustans. 



Genus 44. Kuarrhaphis nov. 



Diagnosis. Canal system presumably leuconoid. Skeleton com- 

 posed exclusively of pei'f orated "needle-eye" spicules. 



For illustrations of this genus see Haeckel [1872]. 



We propose this name for Haeckel's Leucyssa cretacea, which 

 differs from all the other species included by him in the genus 

 Leucyssa in the remarkable perforation of the " needle-eye " 

 spicules. Spicules of practically identical form are found in the 

 genus Baeria^ and we must refer the reader to that genus for a 

 discussion of their nature and origin. In Baeria they are still 

 associated with triradiates and colossal quadriradiates. Whether 

 Kuarrhaphis is to be regarded as derived from a Baeria-like 

 ancestor by the complete suppression of the radiate spicules,, 

 or whether the remai^kable "needle-eye" spicules have arisen 

 independently in the two cases, it is impossible to decide. 



The only known species is :— 



1. K. CRETACEA Haeckel. 



Leucyssa cretacea Haeckel [1872]. 



Genus 45. Eilhardia Polejaeff [1883]. 



Diagnosis. Sponge calyciform, with pores on the inner and 

 oscula on the outer surface of the cup. Canal system leu- 

 conoid. Skeleton of the chamber layer confused, composed 

 of triradiates of various shapes and sizes, and of microxea. 

 Cortex of inner surface with microxea and sagittal triiadiates,. 

 cortex of the outer surface with large oxea and sagittal 

 triradiates. 



For illustrations of this genus see Polejaeff [1883]. 



The only known species of the genus is Polejaeff's Eilhardia 

 schtdzei, a highly remarkable sponge in many ways, the distri- 

 bution of the pores and oscula being exactly the reverse of the 

 usual condition in cup-shaped sponges, and indicating that the 

 sponge cannot be regarded as a single leuconoid person with 

 expanded osculum, in the same way as the calyciform Pericharax- 

 peziza. 



