of the North Atlantic and of North-Western Europe. Q>\b 



The vermiform last limb is small ; at the extremity one lip is in the form of a 

 blunt tooth (fig. 8); the other is divided into several (six?) finger-like curved 

 processes, which are ciliated on the edges ; the spines are numerous (twenty- 

 counted), scattered for some distances along the limb ; at their extremities (fig. 9) 

 they bear two or three pairs of spinules, and the extremity is drawn out to a long 

 and very fine termination beyond the last pair of spinules. Caudal laminae (fig. 10) 

 with seven chief ungues, which are crenated on the edge, and thirteen others of 

 much more slender form ; the arrangement of these is unusual ; commencing from 

 the base, we find first six .slender seta-like ungues, then a distinctly larger one (the 

 first and much the smallest of the seven large ungues, the six following gradually 

 increasing in length) followed by a setiform unguis, then a large unguis, setiform 

 unguis, large unguis, two setiform ungues the posterior the larger, large unguis, 

 two setiform as before, large unguis, two setiform as before, and then two terminal 

 large ungues, of which tlie penultimate is the longer. 



Habitat. — The type specimen, a male, was dredged by the "Challenger'* 

 Expedition, Stat., 168, which is a little to the East of New Zealand, lat. 40° 28' S.; 

 long. ITT"" 43' E., in 1100 fathoms, bottom temperature, 2° o. C. ; bottom, gray 

 ooze. The second specimen, from which the animal is here described, and the 

 drawing made is a female, which apparentl}^ differs in no respect from the male 

 except in sex, was procured by the "Porcupine" Expedition of 1869, in the 

 Atlantic, west of Donegal Bay, Ireland, Stat. 20, lat. 55° 11' N., long. 11° 31' W., 

 in 1443 fathoms, bottom temperature 37° Fahr. It is interesting to observe, that 

 though the two specimens were found so very far apart, the temperature of the 

 water only differed by \\ degree, since 2° C. equals 35*6 Fahr. 



Genus 2. Cypeidina, H. Milne-Edwards, 1838. 



In Lamarck, " Hist, des Anim. sans verteb.," vol. v., p. 178 (including sub- 

 genus Pyrocypris, W. Miiller). 



Shell, ventricose, never sculptured, oval ; only slightly differing in the sexes ; 

 antennal sinus opening downwards, overhung in front by the rostrate process, 

 which bends downiwards ; sinus much contracted by a thin lamina — an extension 

 of the inner margin of the shell — which surrounds it ; the hinder extremity may 

 be angled, or have the antero-posteal corner with or without pouting lips. 



Eyes well developed. Frontal tentacle short, usually fusiform. Antennules 

 (PI. LV., fig. 1) seven-jointed, in both sexes furnished with a large sensory organ 

 at the hinder extremity of the antepenultimate joint, but of entirely different 

 form in the two sexes ; last joint ending in many setse, of which three are 

 primary; in the male (PI. lx., figs. 19-21) two of the setse possess basal 



lEAUS. EOT. TUB. SOC, N.S. VOL. T., PABI Xn. 4y 



