236 Part III. — Eleventh Annual Report 



the species contained in the work of that author ; and while doing so, he 

 recognised a close resemblance between Canthocamptus crassus, G. 0. Sars, 

 and Attheyella spinosa, Brady, and between Canthocamptus pygmscus, 

 G. O. Sars, and Attheyella cryptorum, Brady ; a farther examination 

 tended still more to confirm the identity of the two species of G. 0. Sars 

 with the corresponding species described by Dr Brady. 



Should my son's identification prove to be correct, the specific names 

 adopted by Professor Brady will necessarily give place to those of Professor 

 G. O. Sars, and in that case the nomenclature of the two species will 

 stand thus: — Attheyella {Canthocamptus) crassa (G. 0. Sars).= Attheyella 

 spinosdj Brady. Attheyella {Canthocamptus) pygmaea (G. 0. Sars) = 

 Attheyella cryptorum, Brady. 



The following is Professor G. 0. Sars' description of the species 

 referred to : — 



(1) Canthocamptus crassus, G. O. Sars (loc. cit., p. 23). 



' Corpus quam in specibns ceteris robnstus segment-is abdominalibus 

 ' postice attenuatis in margine postico subtus et ad latera pilis vel aculeis 

 ' sat longis pectenatim ornatis. Kami caudalis forma singular! fere ovati et 

 ' ad basim valde constricti setis apicalibus brevibus er valde divergentibus ; 

 ' setae intermedia? duoae insolito modo flexuosoS in medio sparsiin cilliatae 

 ' exteriore quam interiore tripl ) breviore. Antennae 1 mi paris sat crassa? 

 ' setis longis dense obsita?. Ramus interior pedum 1 mi paris 3-articulatis 

 ' exterior aliquanto longior in paribus sequentibus 3st brevissimus et 

 ' biarticulatus. Pedum 5 ti paris articulus basilis introrsum parvnm dila- 



tatus et ut articulus ultimus setis longissimus prseditus. Color albidus, 



Ion git circit # mm.' 



O -± 



(2) Canthocamptus pygmceus, G. 0. Sars {loc. tit., p. 21). 



' Corpus postice parum attenuatum segmentis abdominalibus sat crassis 

 versus marginem posteriorem ad latera et subtus serie transversa aculeoruin 

 instructis. Kami caudales brevissimis latioris quam longiores setis 

 majoribus apicalibus duabus sat divergentibus in medio aculeatis, 

 exteriore dimidiam longitudinem interioris aequante. Operculum anale 

 dentatum, dentibus majusculis. Antennae 1 mi paris brevissimae pedun- 

 culo (articulis basilibus 1-composito) crasso tlagello vero valde attenuato. 

 Ramos interior pedum 1 mi paris exteriore paullo brevior ut in paribus 

 sequentibus duobus biarticulatus, in pari -i to unarticulatus minimus 

 articulo 1 mo rami exterioris vix longior. Pedum 5 ti paris biarticula- 

 torum, articulus 1 mus introrsum in processum foliiformen magnum et 

 setiferumarticulatum ultimum minimum etrotundatum longe superantem 

 exit. Oculus minimus a margine antico capitis reaiotus saccus oviferus 

 elongato-ovatus. Animal sat pellucidum colore plerumque albidointerdum 

 leviter rubicundo longit vix h mm.' 

 The species provisionally described iu this paper on the fauna of the 

 Inlaud Waters of Scotland under the name of Attheyella propinqua may 

 probably be identical with Sars' Canthocamptus brecipes; but as there 

 are apparently one or two important differences between them, it seems 

 better for the present to retain the specific name adopted in this paper. 



