CLAVELLA PARADOXA. 223 



robust. Mandibles somewhat similar to those of that 

 species, but the maxillae are slender and provided with 

 three digitate terminal processes. First maxillipeds 

 similar to those of Clavella scombri ; second maxillipeds 

 very short, coalescent, and fixed to a terminal chitinous 

 plug. Length, exclusive of the cephalothorax, about 

 4 mm. 



Male. Very small, nearly globular in shape, and 

 somewhat similar in structure and appendages to the 

 males of other species of Clavella.* 



Habitat. Parasitic on the gill-filaments of mackerel 

 (Scomber scombr us). Plymouth (Bass ett- Smith). Irish 

 Sea (A. Scott). 



9. Clavella quadrata Bassett-Smith. 

 (Plate LXVIII, fig. 15.) 



1896. Anchorella quadrata Bassett-Smith. (6) p. 15, pi. iv, fig. 5. 



1899. Anchorella quadrata idem. (8) p. 504. 



1906. Anchorella quadrata Norman & T. Scott. (88) p. 221. 



Female. Cephalothorax much longer than the 

 genital segment. Genital segment almost quadri- 

 lateral in outline. Abdomen of extraordinary size for 

 animals of this genus; somewhat club-shaped, and 

 equal to about two-thirds the length of the genital 

 segment. Egg-strings small and broadly ovate. First 

 pair of maxillipeds placed close to the mouth, well 

 developed ; second pair short, opposite to the abdomen 

 and at the base of the neck, thick and completely 

 united, terminating in the organ of adhesion, which 

 has the form of a cup with a long pedicel. 



This species is much like Anchorella falax Heller, in 

 form, except for the great size of the abdomen. 



The male has not been observed. 



Habitat. Parasitic on the gill-arches of Callionymu* 

 lyra, at Plymouth ; only a few specimens were obtained 

 (Bassett-Smith). 



* One of the authors, when first recording the male of C. paradoxa, states 

 that he could only find one pair of maxillipeds (see ' Trans. Biol. Soc. Liver- 

 pool,' vol. xx, p. 53, 1906). This was evidently due to the second pair having 

 been accidentally destroyed : he has since found that there are two pairs, 

 as in other males of the same genus. 



