of the Fishery Board for Scotland. 



175 



The female specimen represented by the drawing (fig. 38) is fully 

 17mm. in length from the head to the end of the posterior thoracic 

 appendages. The male of this species, one of which is represented by 

 fig. 39, measures about 2mm. in length. 



Brachiella insidiosa, Heller. (PI. VIII., figs. 10 and 41.) 



1865. Brachiella insidiosa, Heller, Keise der Novara, p. 239, 



PI. XXIV., fig. 1. 

 1896. Brachiella insuHosa, Basset-Smith, Ann. and Mag. Nat. 



Hist. (6), vol. xviii., p. 14, PI. VI., fig. 2. 



This is a moderately robust species, the cephalothorax is short, and so 

 are the second maxillipedes. There are two pairs of posterior appendages 

 to the thorax in this species ; those at the posterior angles are elongated 

 and slender, and the intermediate ones are short (fig. 40). The female 

 specimen represented by fig. 40 measured about 12-5mm. ; the male 

 (rig. 41) is somewhat like the male of Brachiella roslrata. 



The mandibles in the female of Brachiella insidiosa are more power- 

 fully armed than those of B. rostrata ; but the maxilla? are rather smaller. 



Habitat. — On the gills of hake, Merluccius vulgaris, captured in the 

 Firths of Forth and Clyde, and on hake brought to the Fish Market at 

 Aberdeen. 



Brachiella meriuccii, Basset-Smith. (PI. VIII., fig. 42.) 



1896. Brachiella meriuccii, Basset-Smith, op. cit. (6), vol. xviii., 

 p. 14, PI. VI, fig. 1. 



From Dr. Basset- Smith's description of this species, which contains all 

 that is of special note concerning it, I extract the following reference to 

 the general appearance of the female : — " Cephalothorax of moderate 

 length, about equal to that of the genital segment, tapering towards the 

 head and bent forward in an obtuse angle. Head slightly widest in 

 front, the arms (second maxillipedes) not quite so long as the cephalo- 

 thorax, being united in the whole length by a thin membrane. Organ of 

 attachment, a chitinous cup with a short pedicle." 



" Genital segment fiddle-shaped, very thick, carrying posteriorly two 

 pairs of elongated processes ; a dorsal pair directed backwards and 

 outwards and a vertical pair rising on either side of a filiform abdomen 

 (post-abdomen, Gerst.), these being directed backwards, outwards, and 

 upwards, encircling the ovisacs." 



In a concluding note Dr. Basset-Smith directs attention to the peculiar 

 position which this species occupies iu the genus Brachiella. According 

 to the present classification this species, he says, should be placed with 

 Anchorella, for in the female the second maxillipedes are short and are 

 also united in their whole length, but the peculiar BracMella-ioxm of 

 the male causes it to be placed in this genus. 



From the peculiar habit of the animal it is somewhat difficult to get a 

 specimen into a good position for drawing. Figure 42 gives a side view 

 of a specimen measuring about 8-5mm. in length. The antennal 

 appendages and mouth-organs agree in general structure with other 

 species of Brachiella. 



A certain amount of variation is observable between different specimens, 

 but the general configuration of the animal, its short arms, and the number 

 and position of the posterior appendages, are all so characteristic of the 

 species that there need be little difficulty in identifying it. 



I have obtained specimens of this Brachiella on hake captured in the 



