403 Part III. — Eighteenth Annual Report 



Several parasitic forms have been observed, among which are the 

 following : — Phryxus abdominalis, attached to the under side of the 

 abdomen of Spirontocaris securifrons, captured in the shrimp-trawl net 

 of the fishery steamer " Garland " near the seaward limit of the Clyde 

 estuary. Pseudione ajinis, attached under the carapace of Pandalus 

 montagui, also from near the mouth of the Clyde. Pleuroerypta 

 marginata, attached under the thoracic shield of Galathea dispersa, taken 

 at Station XIII. (Upper Loch Fyne), October 10th, 1899. Aspidophryxus 

 peltatus, attached to the back of Erythrops serrata and Erythrops elegans* 

 from deep water to the east of Arran, Firth of Clyde, July 18th, also 

 obtained at Station XIII. (Upper Loch Fyne) on 29th December 1899. 



Cumacea. 



Several species of cumacea have been obtained in recent gatherings 

 of tow-net and dredged material, most of which have already been 

 recorded, but the following may be mentioned : — Campylaspis rubicunda 

 has again occurred in bottom-gatherings from the deep water of Upper 

 Loch Fyne. Cumella pygmoea was obtained in dredged material from 

 Tarbert Bank, Lower Loch Fyne. Nannastacus unguiculatus and species 

 of Diastylis have also been observed in Clyde tow-net gatherings. Guma 

 edwardsii was obtained in a bottom tow-net gathering collected in Aber- 

 deen Bay; while Cumopsis edwardsii (sp. Bate) ( = (7. goodsiri, Van Ben.f) 

 was taken between tide-marks on the shore near Millport, Cumbrae, 

 Firth of Clyde, on May 6th, 1899, where it had previously been found 

 by Dohrn thirty years before. J Cumopsis longipes (Dohrn) ( = C. laivis, 

 G. 0. S.) has also been recorded from the Clyde. These two species are 

 somewhat like each other in size and general appearance, but in Cumopsis 

 edwardsii the cephalo-thoracic shield is adorned on both sides with two 

 oblique and arcuate lateral folds ; while in that of the other species the 

 lateral folds are altogether wanting. Moreover, the natatory branches of 

 the first pair of feet in Cumopsis edwardsii are composed of ten joints, 

 but of only eight joints in Cumopsis lo?igipes.§ Cumopsis edwardsii did 

 not appear to be very rare between tide-marks at Cumbrae. A con- 

 siderable number of adult and young specimens were included in the 

 gathering I collected at Cumbrae in May last. 



Schizopoda. 



Thysanoessa neglecta (Kroyer). — I have again to report the occurrence 

 of this Euphausid from the Firth of Clyde. In my Notes published in 

 the Seventeenth Annual Report, Thysanoessa neglecta is recorded for the 

 Clyde for apparently the first time. The specimens referred to in that 

 Note had been obtained in a bottom tow-net gathering from Station X., 

 near the seaward limit of the estuary, collected on January 16th, 1899, 

 at a depth of 26 fathoms. The specimens referred to on the present 

 occasion were obtained in two separate bottom tow-net gatherings from 

 Station XII., between Arran and Turnberry Head. These gatherings 

 were collected, the one on the 18th and the other on the 24th of July 

 1899. In the first one five specimens were obtained, but only two were 

 observed in the other. This species, though apparently rare in the Clyde 

 district, is one of the more common schizopods on the East Coast As 

 pointed out by Dr. Norman in his useful " Synopsis of the British 



* A specimen of the curious Aspidoecia normani occurred also on the back of a 

 specimen of Erythrops elegans, from the same part of the Clyde estuary. (See also record 

 of Aspidoecia in Part III. of the Sixteenth Ann. Report oj the Fishery Board for 

 Scotland. 



t Cf. Scott, S. F. B. Rept., 1888, p. 253. 



X Cf. Jen. Zeitschr., vol. v., 1869 ; Unters. ub. Ban u. Eniw. d. Arthropoden, 1870, p. 23. 



§ Vide Prof. G. 0. Sars' description of the two species in his work Middelhavets 

 Gicmaceer. 



