of the Fishery Board for Scotland. 149 



drawing is given of them. In both branches of the third pair the armature 

 of the first and second joints resembles that of the same joints in the first 

 pair, but in the third joint of the outer branches there are three short 

 spines on the outer margin, five setae on the inner margin, besides a 

 moderately stout terminal spine ; while that of the third joint of the 

 inner branches has three setae on the inner margin, a small seta on the 

 outer margin, and a stout spine with a seta in front of it at the apex 

 (fig. 9). 



In the fourth pair the outer branches only are developed, and resemble 

 the outer branches of the third pair ; the inner branches are represented 

 by a minute digitiform process (fig. 10). 



The fifth pair very minute. 



Habitat. — Dredged in the vicinity of Culross, a few miles above 

 Queensferry, Firth of Forth. 



This form is in some respects similar to Dyspontius striatus, but it 

 differs in having only eight-jointed antennules and in the abdomen being 

 very short. The male is unknown. 



Fam. Nicothoid^e. 

 Genus Nicothoe) Aud, and M. Edw., 1826. 



Nicothoe astaci, Audouin and M. Edwards. 



1826. Nicothoe astaci, Aud* and M. Edw., Ann. Sci. Nat., 1st 

 ser., vol. ix., p. 345, taf. 49, figs. 1-9. 



Dr. H. C. Williamson, while examining a lobster sent to him from 

 Dunbar, observed this curious parasite adhering to one of the gills and 

 kindly handed it over to me. This is the first specimen of Nicothoe I 

 have seen from the Forth district. The distribution of this species, so 

 far as concerns the British Islands, appears to be coextensive with its 

 host. 



Fam. Choniostomatid^j. 



Genus Sphmronella, Salensky (1868). 



Sphceronella minuta, T. Scott. PI. xii., fig. 18 ; pi. xiii., fig. 16. 



This small form — parasitic on the Amphipod Perioculodes longimanus 

 (Spence Bate) — was described in Part III. of the Twenty-second Annual 

 Report of the Fishery Board for Scotland, published in 1904 (pi. xv., figs. 

 11-15). One or two more specimens of Perioculodes infested with the 

 same species of Sphceronella were recently observed in gatherings of 

 small Crustacea collected in the Moray Firth by Dr. H. C. Williamson, 

 to whom I am indebted for the specimens. Figure 18, plate xii., shows a 

 Perioculodes with a parasite in situ, and figure 16, plate xiii., shows an 

 enlarged drawing of an adult female bearing two ovisacs, each of which 

 is about as large as the parasite itself. 



Sphceronella minuta, var. valida. PI. xiii., fig. 17-20. 



This form, which was obtained in the marsupium of an amphipod, 

 Melamphopus cornutus, Norman, resembles Sphceronella minuta so closely 

 except in size, that I can only regard it as a large Variety of that species. 

 The female, which is represented by the drawing (fig. 17, pi. xiii.), 

 measures *73mm. in length, or about one and a half times the size of 

 S. minuta. The body is globular in form and the appendages, so far as 



