FEOM THE GULF OF GUINEA. 117 



which is finely serrate on the inner edge (fig. 10). First swimming-feet also similar to 

 that species, but more slender, and provided with much longer terminal spines, — the 

 terminal spine of the outer branch is equal to about three times the length of the joint 

 from which it springs. The terminal spines of the three pairs (both branches) are also 

 long. The inner branch of the fourth pair is much shorter than the outer branch, and 

 its three joints are nearly equal in length ; the terminal spine is long and setiform. 

 Fifth pair of feet as in Onccea obtum. 



Habitat. Station 2, 50 fathoms, collected January 1st, between 7.20 and 8.20 

 P.M. Station 9, 50 fiithoms, collected January 10th, during the day. Ofi" Appi * 

 (near Porto Novo), surface, collected January 18th (day). Lat. 3° 55' 3" N., 

 long. 4° 7' 3" E., 30 fathoms, collected January 20th. Lat. 2° 34' 9" N., long. 5° 22' 2" E., 

 20 fathoms, collected January 21st. Lat. 1° 55' 5" N., long. 5° 55' 5" E., 360 fathoms, 

 collected January 22nd. Station 23, in two gatherings at 30 and 85 fathoms, collected 

 February 5th. All the gatherings except the first one w^ere collected during the day. 



Though I have included this species under Onccea, it nevertheless differs very 

 markedly from the very common Onccea ohtusa, Dana. The last joint of the posterior 

 antennse is elongate and slender ; the inner branch of the fourth pair of swimming-feet is 

 considerably shorter than the outer branch, and consists of three nearly equal joints ; 

 the al)domen is long and slender, and the last three segments are much longer, com- 

 paratively, than in Onccea obtusa. These differences, taken together, should j^erhaps be 

 considered of more than merely specific value, but I prefer meantime to refer the species 

 above described to Oncceci. 



Note. — The species described above agrees in several points with Concea rapax, 

 Giesbrecht (Mon. Pelag. Copep. of the Gulf of Naples), and should perhaps be ascribed 

 to that genus. 



ONCiEA MEDITERRANEA (Claus). (PI. XIII. figS. 13-17.) 



1863. Antaria mediterranea, Claus, Die freilebenden Copepadeu, jj. 159, pi. xxx. figs. 1-7. 



Length '85 mm. (l-30th of an inch). Somewhat like Onccea obtusa in general form, 



but with a proportionally shorter abdomen. Abdomen, including caudal stylets, equal 



to about two-fifths the length of the ccphalothorax ; length of first abdominal segment 



equal to about twice the breadth, and to fully twice the entire length, of the remaining 



segments ; and, togetlier with the caudal stylets, the length of the last abdominal 



segment is rather greater than that of the two iireceding segments added together. 



Caudal stylets about twice as long as broad, and nearly equal in length to the last two 



abdommal segments. Anterior antennse slender ; the pro2)ortional lengths of the joints 



are nearly as shown in the formula : — 



2.3.8.2.1.2 

 12 3 4 5 0" 



* Note lij Mr. llattray. — " Appi is a flourishing village, with three French factories. It is the nearest port to 

 the inland town of Porto Novo, and communicates with it by a lagoon. The surf at Appi is very heavy, and it is 

 impossible to land except in a native boat built for that purpose. The boats are manned by about sixteen negroes 

 and propelled by paddles. The beach is steep and sandy." 



