414 STHENELAIS ZETLANDICA. 



the tentacle (his antenna), the ciliated rosette of the first segment, chitinous papillae, and 

 fringed scales (simple papillae), and gives the detailed structure of the feet with figures. 

 De Saint-Joseph (1888) observed many examples of Hal acarus olivaceus on the body of 

 one. He agrees with me in thinking that S. Idunse, Rathke, is identical with S. boa, Johnst. 



2. Sthenelais zetlandioa, Mcintosh, 1876. 



Specific Characters. — Head absent, and body fragmentary. Scales somewhat reni- 

 form or irregularly rounded, densely covered with low flat papillae, the outer and part of 

 the posterior edge bearing a closely arranged series of minute clavate cilia. Dorsal lobe 

 of the foot rather long, and obliquely bevelled from above downward, bearing a tuft of 

 bristles that are longer and more finely spinous than in S. boa. Beneath the spine are 

 a series of small papillae with truncated and papillose extremities. Central lobe irregu- 

 larly conical, with numerous papillae, at the tip of which are the secondary processes or 

 warts. Along the ventral border is a series of globose warts. The upper ventral 

 bristles have proportionally strong shafts, with four or five rows of spines at the distal 

 end, and a terminal bifid appendage usually of two joints. The slender inferior ventral 

 have three divisions in the terminal appendage — all with a hooked tip, and a secondary 

 process beneath. 



Habitat. — Dredged off the Shetland Islands by Dr. Grwyn Jeffreys in 1867. Mr. 

 Harvey-Gibson found a fragment (?) off Port Erin, Isle of Man. 



Synonyms. 



1876. Sthenelais zetlandica, Mcintosh. Trans. Zool. Soc, ix, 390, pi. lxx, f. 15 — 17. 

 1886. „ „ Harvey- Gribson. Verm. Liver., p. 151. 



1891. ■„ „ Hornell. Op. cit., p. 238. 



Head. — Absent in the preparation, and the anterior end injured. The proboscis 

 appears to have the ordinary structure — with the horny teeth, and the dorsal and ventral 

 rows of conical papillae. 



Body. — About the size of Sthenelais limicola, and having a similar appearance. 

 The scales are somewhat reniform, or irregularly rounded anteriorly, and the entire 

 surface densely covered with flat papillae, which on the folded edge of the scale form 

 low, smooth warts, larger in proportion than in Sthenelais boa. The outer and part of 

 the posterior edge again bear a somewhat closely arranged series of minute clavate cilia 

 (Plate XLI, fig. 24), almost globular at the commencement on the posterior border, and 

 with minute processes or palpocils on the summit, those on the outer edge being more 

 slender than those on the posterior border. 



The feet (Plate XXX, fig. 14) have dorsally a branchial process and three ciliated 

 T-shaped organs beneath. The superior lobe is rather long, and obliquely bevelled 

 from above downward. It bears beneath the spine a series of rather small papillae, 

 which have truncated extremities provided with several accessory papillae. The 

 superior bristles are longer in proportion than in $. boa, but do not form so broad a fan 



