396 



Part III. — Eighteenth Annual Report 



we know of the distribution of this species tends to show that it is more 

 or less restricted to brackish water. 



Ilyopsyllus coriaceus, Brady and Robertson. 



1873. Ilyopsyllus coriaceus, B. & R., Ann. and Mag. Nat. Hist. 

 (4), vol. xii., p. 132, PI. IX., figs. 1-5. 



I have to record the occurrence of this small but interesting species 

 from the Cromarty Firth. It was obtained in a brackish-water pool at 

 the mouth of the River Alness in the summer of 1893, and only one 

 specimen was observed. It was not recorded at that time, as it was 

 expected that other specimens might be found, when a description with 

 drawings of the species would have been prepared. No more specimens 

 have, however, been discovered, and I now therefore place on record the 

 solitary specimen obtained, which appears to be a female. 



Quite recently the Rev. A. M. Norman very kindly presented me with 

 a few specimens of this species collected by himself at Birterbuy Bay, 

 Ireland, in 1874. These at first sight looked as if they belonged to another 

 species, for, instead of the broad spathulate furcal setae referred to in 

 Prof. G. S. Brady's description and figures, the principal furcal setae were 

 long and slender ; but this, it was afterwards found, was merely a sexual 

 difference, the specimens I had received from Dr. Norman being males, 

 whereas the Cromarty Firth specimen, like that described by Prof. 

 Brady, was a female. Moreover, it was observed that a form of 

 Ilyopsyllus, which, in my report on some Entomostraca from the Gulf of 

 Guinea, I had described under the name of Ilyopsyllus affinis, resembled 

 so closely these Birterbuy males that it is probably only a southern 

 form of Ilyopsyllus coriaceus. The Gulf of Guinea specimens were 

 obtained in a shore-gathering collected at the Island of Sao Thome. 

 These Copepods are strongly gibbous on the dorsal aspect, and the 

 peculiar spathulate furcal setae of the female of Ilyopsyllus coriaceus serve 

 to distinguish it readily from its congeners. 



Scutellidium tishoides, Claus. 



1866. ScuteUidium tisboides, Claus, Die Copep.-Fauna v. Nizza, 

 p. 21, t. iv., figs. 8-15. 



This somewhat rare copepod has been obtained at various times in 

 shore-pools between tide-marks at Bay of Nigg, Aberdeen. The species 

 does not appear to be very rare in some of the gatherings obtained here. 

 On the other hand, I have as yet failed to obtain it in the Firth of Clyde, 

 and neither Mr. Robertson nor Prof. Brady appear to have observed it 

 there ; neither do I remember of its having been observed by us in the 

 Firth of Forth — probably its distribution is local rather than rare. The 

 colour of the Bay of Nigg specimens was generally not very pronounced ; 

 some were colourless, but usually they were tinged more or less with a 

 light brownish pigment. 



Glausia cluthce, T. and A. Scott. 



1896. Clausia cluthce, T. and A. Scott, Ann. and Mag. Nat. 

 Hist. (6), vol. xviii., p. 1., PI. I., figs. 1-12. 



Several specimens of this curious copepod have been obtained in 

 dredged material from Tarbert Bank, Lower Loch Fyne. Though this is 

 apparently the first time that Clausia cluthai has been recorded from 

 Loch Fyne, it is not the first time for the Clyde generally; the specimens 

 from which the species was described were discovered in Ayr Bay in 



