58 CRYPTOPLAX. 



Haddon found the posterior pair of tufts wanting in one of the spec- 

 imens 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 absent, 

 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. 



Cryptoplax montanoi Rochebrune. Corpus oyoideum, crassum, 

 antice rotundatum, intense villosum, aurantiaco 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 brevissimus obsito. Long. 0,045 ; lat. 0,016. (Rochebrune, Bull. 

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



Borneo; Lucon (Drs. Montano and Rey). Rare. Paris Mus. 



This is probably a synonym of C. striatus. 



Cryptoplax peroni Rochebrune. Corpus angustum, antice 

 rotundatum, rugosum, violaceum, fasciis albidis passim cinctum ; 

 valva antica subtriangularis ; valvis centralibus ovatis, elevatis, 

 radiatim sulcatis, postica lata. Long. 0,022 ; lat. 0,007. (Rochebr.> 

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



New Holland (Peron and Lesueur). Rare. Paris Mus. 



Cryptoplax torresianus Rochebrune. Corpus elongatuin, antice 

 posticseque rotundatum, pilosissimum, luteo rufum, valva antica 

 rotundata, subfodiata, valvse centrales elongatse. intense umbonatse, 

 antice macula nigra pictee ; areis lateralibus longitudinaliter gran- 

 ulose striatis, granulis squamiformibus ; valva postica umbonata, 

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

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



Torres Straits. Rare. Paris Mus. 



Cryptoplax caledonicus Rochebrune. Corpus elongatum, insuper 

 spinossimum, antice acuminatum, postice rotundatum, luteolum, 



