58 RYFTOPLAX. 



II addon found the posterior pair of tufts wanting in one of the spec- 

 i innis collected by the Challenger. He further remarks: "The 

 only conclusion at which we can arrive in this species is that nor- 

 mally nine pairs of tufts are present, but that in some specimens 

 more or fewer of the posterior pairs may be absent. This further 

 leads us to the supposition that they may be entirely ab^-nt, 

 although we have at the present time no direct evidence in support 

 of the last alternative." 



False and insufficiently defined Cryptop laces. 



The following descriptions are of course worthless for purposes 

 of identification. They are introduced here simply to save students 

 the trouble of looking them up in the original publication. No 

 information other than that here given has been published. 



Oryptoplax montanoi Rochebrune. Corpus oToideum, crassum, 

 antice rotundatum, intense villosum, atirantiaco fulvum, fasciis nigris 

 luteo marginatis, cinctum ; valvis medianibus minutis, rostratis 

 lateraliter striatulatis ; area centralis subsquamosa, squamis rectis, 

 acutis ; valvis anticis rotundatis, rugosissimis. Ligamento marginis, 

 pilis brevissimusobsito. Long. 0,045 ; lat. 0, 016. (Rochebrune, Bull. 

 Soc. Philom. Paris, 1881-'82, p. 190.) 



Bor >/<"<; Jsucon (Drs. Montano and Rey). Rare. Paris Mus. 



Tli is is probably a synonym of C. striatus. 



Cryptoplax peroni Rochebrune. Corpus angustum, antice 

 rotiindatum. rugosum, violaceum, fasciis albidis passim cinctum ; 

 valva antica subtriangularis ; valvis centralibus ovatis, elevatis, 

 racliatim sulcatis, posticalata. Long. 0,022 ; lat. 0,007. (Rochebr., 

 Bull. Soc. Philom. 1881-'82, p. 193.) 



\> n^ Holland (Peron and Lesueur). Rare. Paris Mus. 



Cryptoplax torresianus Rochebrune. Corpus elongatum, antice 

 posticjeque rotundutum, j)ilosissimum, luteo rufum, valva antica 

 rotundata, subfodiata, valvse centrales elongate, intense umbonat; , 

 antice macula nigra pictse; areis lateralibus longitudinaliter gran- 

 ulose striatis, granulis stjuamiformibus; valva postira umbonata. 

 umbone prealto, conico, obtusissimo. Long. 0,060; lat. 0,004. 

 (Rochebr., Bull. Soc. Philom. Paris, 1881-'82, p. 195.) 



Torres Strait*. Rare. Paris Mus. 



Cryptoplix f us Rochebrune. Corpus elongatum, insuper 



spino&iiimuti, aiiti<v amininatum, justice rotundatum, luteolum, 



