176 



Part III. — Eighteenth Annual Report 



Firth of Clyde by the " Garland," and also on large hake brought to 

 the Fish Market at Aberdeen. Bmchiella merluccii is usually found 

 attached to the gill-rakers of the hake, and chiefly on the larger 

 specimens of the fish. 



Genus Anchorella, Cuvier (1817). 



In this genus the arm-shaped appendages are very short, and they 

 are united to each other from the base so as to resemble a single 

 organ (Baird). 



Anchorella emarginata, Kroyer. (PI. VIII., figs. 49-51.) 



1837. Anchorella emarginata, Kr., Xaturh. Tidsskr., r. i., 

 vol. i., p. 287, PI. III., fig. 7. 



A specimen of Anchorella which appears to belong to Anchorella 

 emarginata, Kr., was obtained on the gills of a twaite shad (Clupea 

 Jinta) captured near Dunbar, at the mouth of the Firth of Forth, in 

 February 1897. This form, though small, readily attracted one's atten- 

 tion because of its extremely long and slender cephalothorax when 

 compared with the robust form of the body and ovisacs (fig. 49). 



The antennules in this species are of moderate length and apparently 

 three-jointed. The mandibles are very small and armed with a few teeth 

 (fig. 51). The maxilla? are rather larger than the mandibles, and are 

 provided with three apical spines ; the secondary branches of the maxilla? 

 are very small (fig. 50). The first maxillipedes are small and moderately 

 strong; the terminal claws are small. Dr. Basset-Smith states that in 

 this species the second maxillipedes are not completely united at their 

 bases ; this is shown to be the case in our specimen also. In this 

 particular, Anchorella emarginata does not altogether agree with the 

 characters of the genus, and seems to form a connecting link between that 

 genus and Brachiella. On the other hand, Bracliiella merluccii, as has 

 been shown, partakes also of the characters of the same two genera, though 

 apparently more closely allied to the genus to which it has been 

 ascribed. It will be observed, further, that in this specimen now under con- 

 sideration the cephalothorax springs apparently from near the middle of 

 the genital segment and becomes somewhat attenuated towards the end ; 

 also that the abdomen is so minute that it is not shown in my drawing 

 (fig. 49). This drawing represents a side view of the specimen, and the 

 projection of the posterio-lateral lobe on the side next the observer pre- 

 vents the abdomen from being seen. 



The specimen, of which the figure is a representation, measures, 

 exclusive of the elongated cephalothorax and of the ovisacs, scarcely two 

 and a half millimeters in length. 



Anchorella (?) rugosa, Kroyer. (PI. VIII., figs. 45-48.) 



1837. Anchorella rugosa, Kr., Naturh. Tidsskr., r. i., vol. i., p. 



294, PI. III., fig. 6. 

 1850. Anchorella rugosa, Baird, op. cit , p. 338, PI, XXXV., 



fig. 8. 



The Anchorella which I ascribe to Kroyer's A. rugosa was obtained on 

 the gills and gill-covers of the cat-fish, Anarrhichas lupus, Linn., where 

 it is sometimes not very rare. I find also on the cod-fish what appears to 

 be the same species of Anchorella. It is evident, however, that these 

 organisms, so far as the British species are concerned, require a more 

 careful study than they have yet received. 



