(Jencral IJistory of (he Marine Pulyzoa. 47 ii 



Busk also descvibcs under his C philoynela a variety 

 {adnata)*, leaving it doubtful whether it is referable to this 

 species, or to C. Jigidaris. It is certainly allied to the latter, 

 but is distinct from it. It has no claim to be associated 

 with C. philomela, but should rank as a separate species. 



Ibid. (p. 57 Sep.). 

 Crihrilina monoceros, MacGillivray. 



This species is certainly not a Crihrilina , as Jullien has 

 already remarked ; it wants the Cribriline structure of the 

 front wall. He refers it to a new genus {Aracknopufiia) , 

 which he makes the type of a family group f. 



The following is his diagnosis : — 



Family Arachnopusidse, Jullien. 



" Orifice trapezoidal ; frontale pcrforde par des pores 

 disposes irreguli^remcnt, aux lieu et place desquels on ne peut 

 distinguer d'origelles sur les exemplaires decalcifies et teints 

 au picro-carminate d'ammoniaque ; opercule pellucide, tr^s 

 mince, trbs difficile h voir, d'une existence douteuse. Ances- 

 trule merabraniporoide dpineuse." 



Genus Arachnopusia, Jullien. 



"Orifice trapezoidal, dont les deux l^vres sont droites ou 

 presque droites ; sur chacun des cotes du trapize que forme 

 I'orifice esiste soit une opine articulde, assez dpaisse et creuse, 

 soit un avicellaire plus ou moins facile ^ voir ; ancestrule 

 membraniporoide a bord libre garni d'epines. 



" Par I'ancestrule ce genre se rapproche des Mucronella de 

 Th. Hincks." 



Upon this I may remark that the characters adduced as the 

 basis of the family are clearly insufficient and wanting in 

 significance. The orifice is by no means " trapezoidal " as a 

 rule ; it is usually arched above and straight or nearly so 

 below. The absence of " origelles " in connexion with the 

 pores, which are thickly distributed over the front wall, the 

 tenuity and transparency of the operculum, and the structure 

 of the primary cell (" ancestrule ") are the only remaining 

 characters. The last-named is not distinctive, but is common 

 to many widely differing genera {Microporella, Schizoporella^ 

 Mucronella, &c.). We know too little as yet of the nature 



* ' Challenger ' Report, pi. xxii. fig. 7. 

 t ' Cap Horn,' p. 02, pi. iii. figs. 8, 9. 



