of the Fishery Board for Scotland. 



289 



ing from J to J inch. Many ova of Ccelenterates and planulse were also 

 present. It is noteworthy that no Lesueuria^ were obtained in this net. 



The Hydromedusae in the mid-water net were still very numerous, and, 

 moreover, the species varied considerably. All did not occur in great 

 numbers on every occasion, probably because the currents carried them 

 diversely. Ttiaumantias melanops, T. liemisplicerica (mature), T. incon- 

 sjncua, Phialidium variabile in the varieties ijlobosa, convexa, and sarnica, 

 T. pilosella (nearly ripe), T. quadrata (immature), and the undetermined 

 form (Plate V. fig. 6), previously procured. Larval Peachise still 

 frequented T. liemisplicerica in considerable numbers, both in and beyond 

 the Bay ; but, on the whole, they were most numerous within its limits. 

 Oceania globulosa was present, and another species with only one yellow 

 tubercle between each pair of tentacles instead of three, with pinkish 

 ocelli and ovaries — yellow by transmitted light ; mature. It came other- 

 wise near Tiara {Oceania) octona. A third had no tubercles between the 

 tentacles, which were in four groups, five in each, and with two additional. 

 The ocelli and ovaries agreed with the former. They may have been 

 varieties of Tiara (0.) octona. The latter was also procured in a ripe 

 condition, and in considerable numbers; indeed, it was the most frequent 

 representative of the genus. Boucjainvillia britannica seemed to be rare, 

 though towards the end of the month it was mature. Stomobrackium 

 octocostatum appeared once in small numbers, and a single example of 

 Tima Bairdii occurred within the Bay, and another near the Bell Rock. 

 Both were comparatively small. 



Beyond the Bay in the neighbourhood of the Bell Rock and 15 miles 

 south of it, a similar Ccelenterate fauna was found in the mid-water net 

 with the addition of fine examples of Oceania iurrita. 



The Ctenophores in the mid-water net were somewhat uniformly numer- 

 ous throughout August. Many examples of Beroe, ranging from \ to 4 

 inches, and often in full maturity, were captured. They were absent from 

 few hauls. Lesueuria occurred sparingly towards the commencement of 

 the month in this net, the diminution in number being in marked contrast 

 with the condition in July. The gradual increase in the size of Lesueuria, 

 as the season advanced is noteworthy. Young examples about f of an 

 inch occur in April, so that the breeding season would be correctly indi- 

 cated by the condition of the specimens just mentioned. Young Lesueuria 7 

 appear to have no ' lappets.' The older forms ranged from \ to 3 J inches in 

 their long diameter. Swarms of Pleurobrachiw appeared in almost every 

 net; but, as a rule, they were small, varying from 4 mm. to J an inch, or a 

 little more. In some hauls all were very small, a feature in marked contrast 

 with their condition in December. The very young Pleurobrachias were 

 characterised by their peculiar trumpet-shaped and prominent mouths. 



The surface-net was less rich than either of the foregoing, but certain 

 forms occurred in great abundance, showing that a transfer of the rich 

 fauna of the lower regions of the water had taken place. Thaumantias, 

 (Phialidium) variabile, var. inconspicua and globoscc, T. octona, T. hemi- 

 sphcerica in full maturity, though like the others by no means in great 

 numbers. Numerous ova of the latter species were also in the low nets. 

 Some small Medusa-buds of unknown relationships occurred in most of 

 the hauls. Others resembled minute Oceanian with eight tentacles, 

 though occasionally one was bifid, thus increasing the number. Lizzia 

 octopunctata was captured on the 7th, but it is more frequent beyond the 

 limits of the Bay — towards the Bell Rock. 



The Ctenophores in this net were represented by a few examples of 

 Beroe at the commencement of the month, and by many small examples 

 of Pleurobrachia. The very young forms presented the trumpet-like 



