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Part III — Eighteenth Annual Report 



species of Gadus, such, for example, as Gadus merlangus, captured in the 

 Clyde and other parts of the Scottish coasts. 



In this species (which belongs to Kroyer's division B) the abdomen is 

 quite distinct, and is in the form of a prominent roundish knob. The 

 cephalothorax, though nearly of the same length, is scarcely so stout as in 

 Anclwrella rugosa, but the second maxillipedes are more produced (fig. 43). 

 The genital segment is moderately elongate and ovate. The female 

 represented by the drawing measures about seven millimetres in length, 

 exclusive of the cephalothorax and ovisacs. 



The male, which is very small, has a general resemblance to the male 

 of Anclwrella rugosa (fig. 44). 



The female antennules are moderately stout, and apparently three- 

 jointed. The maxillae are small, somewhat dilated towards the distal end, 

 and provided with two terminal spines. The first maxillipedes are also 

 small, they are each armed with a short terminal claw. 



Anclwrella stellata, Kroyer. 



1838-39. Anclwrella stellata, Kr., Naturh. Tidsskrift, r. i., 



vol. ii., p. 142, PI. lit, fig. 5. 

 1864. Anclwrella stellata, Kr., op. cit., r. Hi., vol. ii., p. 383. 



This species of Anclwrella was obtained on some specimens of hake, 

 Merluccius vulgaris, forwarded from the Clyde to the Laboratory at Bay 

 of Nigg. The fishes were captured by the " Garland " in Kilbrennan 

 Sound on December 18th, 1899. 



In Anclwrella stellata the cephalothorax is moderately long and slender, 

 and has the appearance of being continuous with, and but a prolongation 

 of, the united second maxillipedes — the head being at one end of the pro- 

 longation and the chitinous plug, which terminates the maxillipedes, at the 

 other ; the length of this portion of the animal measures on an average 

 about 6mm. The genital segment is ovoid in shape and measures about 

 4mm. in length by fully 2mm. in thickness. When the animal is alive 

 or only recently dead this segment has the appearance of a pellucid and 

 almost transparent bag, so that the creature is liable to be passed over 

 under the belief that it is only a small roundish mass of mucus ; in spirit 

 the genital segment assumes a whitish appearance. 



The membranous tissue surrounding the second pair of maxillipedes, 

 and binding them together, is nearly transparent, and the maxillipedes 

 could be easily seen side by side within their investment ; it could also 

 be observed that each maxilliped terminated in two or three minute 

 roundish lobes, wbich together were arranged in a semi-circular manner 

 round the inferior aspect of the apices of the maxillipedes, while from 

 between the apices on the upper side proceeded the small chitinous 

 process by which the creature attached itself to the fish, Moreover, in 

 each of the specimens of this Anclwrella that was examined, the chitinous 

 process was observed to be adherent to the basal part of a scale, but the 

 process did not penetrate through the scale, but spread out into a sucker- 

 like disk between its outer and inner surfaces ; and this sucker-like disk 

 when closely examined exhibited a series of clear oval markings, which 

 were arranged at regular intervals, and in a stellate manner, just within 

 the circumference of the disk. The markings, which could be easily seen 

 with a hand-lens, did not extend to the margin as shown in Kroyer's 

 figure, but a small portion of the margin formed a continuous rim round 

 the periphery of the disk ; it is from this stellar arrangement of the 

 pellucid markings that the specific name is derived. 



The abdomen is scarcely developed in this species ; it appears as a very 



