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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 pygm&us, 

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

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

 witli 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 

 spinosa, Brady. Attheyella (Canthocamptus) pyrjm&a (G. 0. Sars) = 

 Attheyella cryptorum, Brady. 



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

 referred to : — 



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



' Corpus quam in specibus ceteris robustus segmentis abdominalibus 

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

 1 sat longis pectenatirn ornatis. Rami caudalis forma si ngulari fere ovati et 

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

 c setse intermedia^ duose insolito modo flexuosaa in medio sparsim cilliataj 

 ' exteriore quam interiore triplo breviore. Antenna3 1 mi pads sat crassas 

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

 ' exterior aliqnanto longior in paribus sequentibus 3st brevissimus et 

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



tatus et ut articulus ultimus setis lougissimus prreditus. Color albidus, 



longit circit § mm.' 



(2) Canthocamptus pygm mis, G. 0. Sars (Ipc. cit., p. 21). 



1 Corpus postice parurn attenuatum segmentis abdominalibus sat crassis 

 1 versus marginem posteriorem ad latera et subtus serie transversa aculeorum 

 ' instructis. Rami caudales brevissimis latioris quam longiores setis 

 ' majoribus apicalibus duabus sat divergentibus in medio aculeatis, 

 ' exteriore dimidiam longitudinem interioris a3quante. Operculum ar.ale 

 £ dentatum, dentibus majusculis. Antennae 1 mi paris brevissimai pedun- 

 ' culo (articulis basilibus 4-composito) crasso flagello vero valde attenuato. 

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

 ' sequentibus duobus biarticulatus, in pari 4 to uuarticulatus minimus 

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

 ' torum, articulus 1 mus introrsum in processum foliiformen magnum et 

 ' setiferum articulatum ultimum minimum etrotundatum longe superantem 

 ' exit. Oculus minimus a margine antico capitis remotus saccus oviferus 

 1 elongato-ovatus. Animal sat pellucidum colore plerumque albidointerdum 

 1 leviter rubicundo longit vix }j mm.' 



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

 Inlaud Waters of Scotland under the name of Attheyella propinqiid may 

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

 are apparently one or two important diil'erences between them, it seems 

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



