356 Mr. R. Kirkpatrick on 



Oscules 3 millim. in diameter, level with surface, with thin 

 margins. Dermal membrane smooth, supported by a reticu- 

 lum of primary and secondary fibres. 



Skeleton formed of a square-meshed reticulum of horny 

 fibres, which latter may be clear or filled with sand-grains. 

 Width of meshes about 245 /jl; width of fibres from 24 to 

 48 fi. 



Spicules. — Megascleres : oxea (rare and possibly foreign) 

 slender, straight, sharp-pointed, 120x2 fi. 



Microscleres : sigmata abundant, 30 to 50 y. in length. 



Locality. W. of Tutanga, 30 fath. 



The specimens, which are of irregular shape, are growing 

 on fragments of Seriatopora, on branches of which they form 

 a thin semitransparent coating, but attaining some thickness 

 between the branches. 



The new species differs considerably from other species of 

 Chondropsis in its comparative freedom from sand and other 

 foreign bodies ; but I can find no other position for it than 

 in the genus Chondropsis, Carter, as emended by Dendy 

 (9, p. 250). 



Pachychalina fibrosa, Ridley and Dendy. 



1887. Pachychalina fibrosa, Ridley and Dendy (20, p. 21, pi. iv. 



figs. 3, 4). 

 18£8. Pachychalina fibrosa, Lindgren (15, p. 293, pi. xix figs. 6 a-e). 



The specimen is in the form of a small dried fragment 

 40 millim. in height, finger-shaped and expanded at the upper 

 end. The colour is pale yellow and the spinules 2 to 3 millim. 

 in height. 



The spicules are strongyles 114 x 35 /m, slightly curved. 



Had it not been for Lindgren's description of transition 

 forms in the spicules, which, in his specimens, include oxea, 

 tornota, and strongyla, I would have hesitated before placing 

 the specimen in the above species. Doubtless Pachychalina 

 spinosissima, Dendy, and Chalina spinifera, Garter, are very 

 nearly allied to the present species, but it is doubtful whether 

 they are identical. 



Locality. Funafuti Atoll. 



Distribution. Off Bahia ; Philippines ; Funafuti Atoll ; 

 Cochin China j Java ; Christmas I. (?) ; Mergui (?). 



Lujf'ariella variabilis (Polejaeff). 



1884. Luffaria variabilis, Polejaeff (17, p. 69, pi. ix. figs. 1-6). 

 1889. Luffaria variabilis, Lendenfeld (13, p. 387, pi. xxxiv. fig. 5). 

 1899. Lufariella variabilis, Thiele (27, p. 25). 



