696 THE VOYAGE OF H.M.S. CHALLENGER. 



topping the outer plate, tipped with four short slightly sinuous spines, and having its 

 inner margin and sides hairy. The figure shows the growth of the new inner and outer 

 plates within the old ones. 



Second Maxillas. — Outer plate a little broader than inner and a little overtopping it, 

 distally tipped with seven or eight weak spines a little curved, and about the same 

 number of shorter straight ones. The distal end of the inner plate bordered with six 

 or seven weak spines, the row ending up with a seta on the inner margin. Fine hairs 

 project along the major part of the otherwise smooth inner margin. 



Maxillipeds. — Inner plates long, narrow, with outer margin slightly bowed, reaching 

 beyond the first joint of the palp ; distal margin indented, and perhaps armed with three 

 small teeth, a few small setse on the inner distal and near the distal margin ; outer 

 plates very large, broad, the rounded distal edges reaching halfway along the third 

 joint of the palp ; inner and distal margins faintly crenulated, quite naked, though 

 within the border there is a show of preparation for spines or setEe ; some way within 

 the inner and not very far from the distal border there is one spinule. Palp with first 

 joint broadest, outer edge much longer than inner, the latter carrying distally one seta ; 

 second joint with outer edge shorter than inner, the latter fringed with ten or eleven 

 setse ; third joint narrow, with five setfe, three on distal half of inner margin ; fourth 

 joint very small, divided between nail and finger. 



The little triturating organs show on each of the pair a row of from nine to ten 

 serrate spines. 



First Gnathopods. — Side-plate irregularly triangular, with some short hairs within 

 the broad distal border and a notch at the posterior distal angle. First joint a little 

 widened distally, two short hairs on front margin ; hinder part of the short second and 

 third joints furred with short hairs, wrist and hand subequal in length, wrist a little 

 widened distally, front margin curved, two or three setae at infero-posterior angle ; hand 

 tapering, setse on or near hinder margin few and short, no noticeable palm ; finger short. 



Second Gnathopods. — Side-plates less widened below than those of the first segment 

 so as to form more of a parallelogram than a triangle, otherwise similar; first joint 

 narrow, with one seta on the front margin ; second joint longer than third ; third shaped 

 like the bowl of a pipe ; wrist longer than hand, a brush of fine hairs on the hinder side 

 followed by one seta near the distal end ; hand furred almost all over, hinder margin 

 longer than front, running out into a small thumb, close to which is placed the finger 

 with a broad base and a narrow terminal hook beset with short cilia. The sloping distal 

 margin of the hand in front of the finger carries four large spines graduated in length 

 from before backwards, all with terminal accessory threads ; other less powerful spines 

 are set more on the side of the hand, and the hinder border is fringed with tooth-like 

 spines. 



First Perseopods. — Side-plates like those of the second segment; they fully cover the 



