of the Fishery Board for Scotland. 



177 



Anchorella rugosa differs very distinctly from the last, especially by 

 the structure of the second maxillipedes. In this spscies these appendages 

 are much more atrophied, being reduced to little more than a small 

 button-like projection at the anterior end of the robust genital segment. 

 The cephalothorax is not so elongated as in the form just described ; it is 

 also proportionally stouter and more rugose. The genital segment is 

 considerably dilated, and, when looked at from above, or below, has a 

 nearly square outline, the two sides being slightly emarginate or con- 

 stricted. The ovisacs are stout and of moderate length. 



The antennules and mandibles (fig. 47) are somewhat similar to those 

 of Anchorella emarginata but larger. The maxilla are distinctly larger, 

 besides being somewhat different in structure ; moreover, the anterior 

 maxillipedes are considerably stouter than the same organs of that species. 



The male is greatly dilated on the dorsal aspect (fig. 46), and measures 

 only about a millimetre in length. The anterior and posterior foot-jaws 

 are stout, aud armed with short but strong terminal claws. 



I have obtained Anchorella rugosa on Anarrchichas lupus in the Firth 

 of Forth and the Firth of Clyde, and also on the same species of fish 

 brought to the Aberdeen Fish Market. 



It seems to me that Anchorella rugosa, Kr., is quite distinct from 

 Anchorella emarginata, Kr., as shown by that author's descriptions of the 

 two forms. As these descriptions are short, it may be of interest to give 

 them in the author's own words, which are as follow : — 



Abdomine nullo vel indistincto. 

 AnclioreMa emarginata, Kr. 

 " Caput mediocre vel parvum, a collo bene distinctum ; colium gracile, 

 longissimum; brachia gracilia, brevissima, bulla simplice; annulus genitalis 

 dilatatus (latior fere quam longior), obcordatus, postice medio sinum 

 prcebens rotundatum." 



Anchorella rugosa, Kr. 

 " Caput latum complanatum, a collo bene distinctum ; collum elongatum 

 sed crassus, valde rugosum ; brachia fere rudimentaria, quasi in discum 

 dilatata, bulla minuta, simplice ; annulus genitalis latior quam longior, 

 sub-quadratus, postice late truncatus, supra infraque rugis sulcisque 

 insignitus." 



Dr. Baird's description of Anchorella rugosa, Kr., agrees with that of 

 Kroyer, but the figure of the species seems to represent some other 

 form. Kroyer in his remarks on the genus also refers to this difference in 

 Dr. Baird's figure. * This want of agreement is probably due to some 

 misunderstanding on the part of the artist. 



Anchorella rugosa, var. (PI. VIII., fig. 52.) 



The specimen represented by figure 52, though it agrees very closely 

 with that from the Anarrchichas, differs somewhat in the structure and 

 armature of the mandibles and maxillae ; the antennules also are slightly 

 different, and will require further study. This form has been obtained 

 on the haddock (Gadus ceglefinus). 



Anchorella uncinata, MUHer. (PI. VIII., figs. 43 and 44.) 



1776. Lemma uncinata, Muller, Zool. Dan., vol. i., PI. 



XXXIII., fig. 2. 

 1850. Anchorella uncinata, Baird, op. cit., p. 337, PI. XXXV, 



fig. 9. 



Specimens of what I take to be this species are not uncommon on 

 * Naturh. Tidsskr., R. III., B. ii., p. 366 (1864). 



