^-0 



smooth^ curved, with long oval head 45 ^. in breadth not un- 

 common at the surface. S.mall oxea (Fig.' ibj lyoo X 30 /*. 



Anatnasnes (^Figs. ig^ g'), rhabdome 9.4 mm. X .02 mm.; with 

 hue hair-like terrnmations ; length of cladus 75 /*, chorda no /i. 



Protngenes (Figs, ic, c') with short stout cladi; rhabdome 5J00 

 X 31 f, length of cladus 78 /i, chorda 70^.. 



Frotrisenes (Fig. ih) trichodal, rhabdome 690 X 2 /<; cladi un- 

 equal, longest cladus 45 /t. 



i'rodisenes (Figs, ik^ k') tnchodal, abundant in poral and 

 oscular areas with dimensions equal to those of trichodai protri- 

 aenes ; cladi about equal. 



Orthotrisenes (Fig. id), rhabdome 4900 X 35 /' ; length of cladi 

 340 ^i, slightly curved. Fig. id' represents a plagiotrisene, which 

 only occurs rarely. 



Orthodiaenes (Fig. le), abundant, and orthomonsenes (Fig. if) 

 with dimensions similar to those of the orthotrisenes. 



Microscleres.— Sigmaspires of two kinds, viz., a serpentine 

 variety (Fig. il) abundant^ 35 to 45 /t in length, with long open 

 coils, and a smaller C-and-S shaped variety (Fig. im) 16 to 20 ju 



in length. 



Locality.— Cape Natal W. by N. ^ N., 11 miles; depth 185- 

 200 fathoms. Bottom — sand and mud; obtained by shrimp trawl. 



The new species is represented by five specimens, the largest 

 of which is 8 X 6.5 cm. in horizontal plane, by 5 cm. in height, 

 and the smallest 3.5 X 2.6 cm. in horizontal plane by 2.8 cm. in 

 height. Of the five specimens, four are provided with a fringe 

 round the poral vestibule, but only one with a well-iruarked fringe 

 round the oscule, a poral fringe being also present in the latter 

 instance. The nearest allied genus is Cinachyra of Sollas^ with its 

 numerous poral and oscular depressions. C. barbata Sollas [n], 

 p. 23^ pis. iii. and xxxix., from Kerguelen is provided with a 

 dense root-tuft and with a cortical layer of radially arranged oxea. 

 C. voeltskoivi Lendenfeld [7], p. loi, pi. ix., fig. 35-53, from Zan- 

 zibar is a spherical free sponge with numerous oscular cloacae and 

 with the pores generally distributed over the surface; again, Tetilla 

 lursuta Dendy [2], p- 75, from the Gulf of Manaar has numerous 

 poral and oscular pits. The chief characlter of the new genus is 

 the localisation of the poral and excurrent openings each in one 

 well-defined region- The pores occupy, in the floor of the vesti- 

 bule, oval spaces bounded by the tufts of trichodai prodijenes, 

 and open into the distal ends of sphinctrate chones, which merge 

 below into sub-cortical spaces, whence ringed in-current canals 

 proceed. The* oscular cloaca presents small circular sphictrate 

 excurrent openings one in each mesh of the superficial network 

 formed by strands of soft tissue. The generic name is sue^g-ested 

 by that of the Echinoderm genus Echinodcardmn, in which the 

 shape of the shell with its mouth and madreporite resembles that 

 of the sponge. The species is named after Dr. Gilchrist 



