LEANIRA HYSTRICIS. 435 



surface. The foot presents a superior lobe rather more prominent than the ventral, and 

 bears long, simple spinous bristles and two papilhe. The inferior division of the foot 

 has two somewhat larger papillae, and the characteristic bristles with the tapering 

 extremities and moniliform markings. The branchial process begins as a minute organ 

 on the twenty-fourth foot. 



Synonyms. 



1874. Leanira hystricis, Ehlers. Ann. Nat. Hist. (4), vol. xiii, p. 292. 



1875. „ „ idem. Annel. c Porcup./ 1869, Zeitschr. f. wiss. Zool., xxv, p. 35, Taf. 2, 



f. 5—11. 



1876. „ „ Mcintosh. Trans. Zool. Soc, vol. ix, p. 408, pi. lxxiii, f. 6—8. 

 1885. „ „ idem. Ann. f Chall./ vol. xii, p. 155, pi. xxiii, f. 9. 



Habitat. — Dredged in the 'Porcupine' Expedition of 1889, off the south-west of 

 Ireland (Station 2), at a depth of 808 fathoms on a bottom of soft sticky mud; 

 also at Stations 23, 87, and 20, the last at a depth of 1443 fathoms, generally on mud 

 and Grlobigerina ooze. In the c Challenger ' it was got off the Azores at depths of 900 

 and 1000 fathoms, and in the 6 Knight-errant ' in 530 fathoms. Yerrill enters it in his 

 list from Cape Cod to the St. Lawrence. 



Head (Plate XXVIII, fig. 17) smoothly rounded, little elevated, and slightly dusky 

 from the presence of pigment along the anterior border. The median tentacle is 

 remarkably short and small, shaped like the handle of an awl — narrow at the base, 

 dilated in the middle, and tapering to a blunt tip. No eyes are visible in the prepara- 

 tions. The anterior border is fixed to the bases of the feet above the palpi, which arise 

 close together on each side of the middle line inferiorly. They are long, tapering, and 

 smooth, and at the base of each, towards the inner and ventral surface, is the scoop- 

 shaped lamella. Immediately above and soldered with the base of the palpus is the first 

 foot, bearing three processes, viz. superiorly a tentacular cirrus about a fifth the length 

 of the palpus ; inferiorly a minute organ of the same nature, and extending only a short 

 distance beyond the peduncle ; and a minute awl-shaped process (lateral tentacle) 

 attached to the base of the peduncle superiorly. The latter is similar in form to the 

 median tentacle near which it is placed. Inferiorly the oral aperture has prominent 

 rugose lips, with a blunt papilla on each side of the median fissure in front. None 

 showed traces of the bristles usually present in allied forms on the bases of the 

 tentacular cirri. 



Body comparatively small and slender, none of the incomplete specimens from the 

 'Porcupine' measuring more than an inch; but an example from the ' Challenger ' 

 reached about two inches, and was also incomplete. The external appearance of the 

 body agrees with that in Sthenelais. 



Scales. — The first and second scales are small and rounded. The rest are also 

 more or less rounded, translucent, and perfectly smooth in outline and surface. 



Feet. — The second foot is directed forward, its dorsal division being represented by 

 a rounded process, which bears about a dozen digit-like papilla? and a series of fine 

 bristles resembling those of the ordinary foot (Plate XLII, fig. 20). The ventral lobe 

 has superiorly and inferiorly a papilla larger than those of the dorsal lobe. The bristles 



