257 Part III. — Twenty-second Annual He-port 



medusarum ; but the largest specimen observed in the collections under 

 consideration was obtained in the same gathering with Anonyx nugax, 

 from Aberdeen Bay. Though the species appears to be widely distributed 

 along the west side of the British Islands, the records of its occurrence on 

 the east coast of Scotland appear to be very few, and its presence in 

 Aberdeen Bay is all the more interesting. 



It may be stated that the gathering from Aberdeen Bay collected on 

 December 23rd, 1903, contained a considerable number of other species 

 of Amphipoda besides the two I have specially mentioned, and the names 

 of the following may be given, Acidostoma obesum, Trypliosa longipes, 

 Ampelisca spinipes, Iphimcdea minuta, and one or two fine specimens of 

 Amathilla homari. Specimens of Diastylis rostrata and Siriella armata 

 were also observed. 



Harpinia pedinata, G. O. Sars. The occurrence of the single specimen 

 of Harpinia pedinata already mentioned in connection with Sphoeronella 

 cluthce, whose host it was, is of sufficient interest to be specially referred 

 to in these notes. The only stations that may be considered as within 

 the British limits where this species has hitherto been observed " are all to 

 the west of Ireland and between Ireland and Rockall."* Its capture at 

 the mouth of the Clyde estuary may be an indication that it may be 

 found in other places when carefully sought for. H\ pedinata, which 

 seems to be confined to moderately deep water, is a form that may easily 

 be mistaken for a more common species, the characters by which it is 

 distinguished being not easily made out without dissection. Professor 

 G. 0. Sars speaks of it as being "by no means rare" off the south and 

 west coasts of Norway and occurring, as a rule, in company with H. 

 negleda. The Rev. T. R. R. Stebbing has seen the Clyde specimen and 

 confirms my identification. 



Metopa borealis, G. O. Sars. The occurrence of this species in 

 Aberdeen Bay has already been referred to under the Choniostomatidse 

 as one of the hosts of Stenothocheres egregius. Metopa borealis, like M. 

 alderi and one or two other members of the same genus, has an unarmed 

 telson, but with the assistance of Professor G. O. Sars' excellent mono- 

 graph, it need not be confounded with any of the other species referred 

 to. M. borealis is a northern form, but appears to have a fairly wide 

 distribution ; it is one of the rarer forms recorded by Dr. Robertson from 

 theJnrth of Clyde. 



Paratylus falcatus, Metzger. One or two specimens of Paratylus 

 falcatus were obtained in a tow-net gathering collected in the Dornoch 

 Firth on December 26th, 1903. Though this Paratylus bears a strong 

 resemblance to P. uncinatus, G. O. Sars, the tooth-like posterior projec- 

 tions of the segments of the metasome on the dorsal aspect readily 

 distinguish it. I have found both forms in Scottish waters, but neither 

 of them very common. 



Megaluropus agilis, Norman. This somewhat curious species, readily 

 distinguished by the peculiar form of the eyes, was obtained in a bottom 

 plankton-sample collected on December 29th about three miles off 

 Lossiemouth, Moray Firth. 



ISOPODA. 



Idothea negleda, G. 0. Sars. Professor G. 0. Sars in his great work on 

 the Crustacea of Norway, now in course of publication, has in Volume II. 



* British Amphipoda, by Eev. A. M. Norman ; Ann. and Mag. Nat. Hist, (7), vol. 

 v., p. 337 (April, 1900). 

 B 



