FEOM THE GULF OF GUINEA. 29 



under such a diversity of conditions might be expected to have a wide distribution, and 

 such is the case witli this Eucalamis. Dana has recorded it from the Pacific and China 

 Seas. In the ' Challenger ' Report it is recorded from the Malayan and Australasian 

 Seas. Sir John Lubbock has recorded it from the Bay of Biscay * and Mr. I. C. 

 Thompson from Madeira and the Canary Islands f. Prof. Claus records a Calanella from 

 the Mediteranean, which Dr. Brady thinks is " in all probability identical with the 

 present species." 



EUCALANUS SPINIFER, n. sp. (PI. I. figs. 15-23.) 



Length 5"5 mm. Forehead triangular ; rostrum as in Eucalanus attenuatus ; postero- 

 lateral angles produced and spiniform ; anterior antennae 22-jointed, reaching to the 

 extremity of the caudal stylets, the proportional lengths of the joints are nearly as 

 follows : — 



40 ■ 11 . 11 ■ 12 . 12 . 13 . 20 . 18 . 20 . 2-5 . 29 . 27 . 29 . 29 . 29 . 26 . 29 . 27 . 24 . 2.3 . 13 . 10 

 12 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22" 



The secondary branch of the posterior antennae small, 7-jointed, the two basal and the 

 terminal joints longer than the others, both branches furnished with numerous plumose 

 hairs. The secondary branch of the mandible-palp 3-jointed, stouter and nearer the 

 distal end of the large basal part than that of E. attenuatus; both branches furnished with 

 a number of long hairs, those of the secondary branch being setiferous from the middle 

 to near the extremity (fig. 17). Anterior and posterior foot-jaws as in E. attenuatus. 

 The inner branches of first pair of swimming-feet 2-jointed, joints subequal; the 

 following three pairs as in Eucalanus attenuatus. Fifth pair of feet in the male 

 1-branched, each branch 4-jointed, the last joint terminating in a long somewhat curved 

 spine ; on tlie inner margin and near the base of the spine springs a stout plumose hair, 

 the length of which exceeds that of the terminal spine. Abdomen very short and 3- 

 jointed, the basal joint as long as the other two together. Caudal stylets nearly as long- 

 as the last two abdominal segments, each stylet furnished with five plumose hairs, the 

 inner one being about half the length of the other four, which are about equal. 



Habitat. Station 9, 50 fathoms tow-netting, January 10th (day collection). Lat. 

 5"" 10' N., long. 3° 56' 2" W., inshore surface tow-netting, January 12th (night 

 collection). Lat. 3° 58' N., long. 3' 42' W., 25 fathoms tow-netting, January 13th (day 

 collection). Lat. 1° 55' 5" N., long. 5° 55' 5" E., 35 fathoms tow-netting, January 22nd 

 (day collection). Lat. 4° 26' 7" S., long. 10° 1' 8" E., 238 fathoms tow-netting, February 

 5th (day collection). 



The tow-nettings from the localities described were the only gatherings in which this 

 Eucalanus was observed, but, though its distribution was limited, a considerable number 

 of specimens were obtained. Its chief and most apparent distinctive characters are the 

 spiniform lateral angles of the last thoracic segment and the form of the male fifth feet. 

 Eucalanus spinifer is also a larger and more robust species than Eucalanus attenuatus, 

 which it closely resembles. 



* Trans. Entom. Soc. vol. iv. pt. 2, p. 10. t Trans. Linn. Soc. 



