ARICIA GRTJBBI. 505 



4. Arioia Guubei, n. s. Plate LXXXV, figs. 8-8 b— bristles ; Plate LXXXVI, fig. 1 



— foot. 



Specific Characters.— Read typical. Anterior region of fifteen bristled segments. 

 Each foot has a dense tuft of camerated or spinose bristles finely tapered, with a stout 

 dorsal cirrus posteriorly. An interval separates it from the ventral division, which has 

 a series of similar but shorter bristles, many of which have shafts with rounded tips. 

 The last three feet of the region have dark brownish spines with long hastate tips. The 

 rows of papillae posteriorly are separated by an interval from the bristles. These papillae 

 occur on the ventral surface of bristled segments thirteen, fourteen, fifteen, and sixteen, 

 and it may be in one or two succeeding segments. The twenty-third foot has the broadly 

 lanceolate branchia, then the elongated dorsal cirrus shaped like a pointed shoe, with a 

 tuft of long serrated (camerated) bristles, amongst which are some simple forms. There 

 are four spines. In the interval between this and the ventral division is a short and 

 rather broad conical papilla or cirrus. The ventral division has a somewhat clavate 

 setigerous region supported by two spines, and a pointed lanceolate lobe attached to it 

 distally and projecting in front of it. The ventral cirrus forms a broad process, some- 

 times with a pointed tip to the exterior of its base at the twenty-third foot. The dense 

 bristles of the dorsal division anteriorly are transversely spinous or camerated forms; 

 those in the upper series of the ventral division are shorter, but of similar structure 

 mixed with broken shafts with rounded tips like stout spines. The last three anterior 

 feet have four dark-brownish hastate spines. At and after the twenty-third foot slender 

 tapering serrate (camerated) bristles, a few simple bristles, and four spines are found 

 dorsally, whilst the ventral division has a few very slender bristles with minutely spinose 

 tips, but none were perfect. 



Habitat. — Dredged in the 'Porcupine' Expedition of 1869 in 422 fathoms on a 

 bottom of sand, stones, and coral. ' Porcupine ' Expedition of 1870 at Station VI in 358 

 fathoms ; and at Station VIII in 257 fathoms. 



The proboscis is extruded as a foliaceous button. 



A comparatively small form, with the typical arrangement of snout anteriorly, and 

 about fifteen of the largely developed anterior feet with vertical rows of ventral bristles. 

 The anterior feet, e.g., the tenth (Plate LXXXVI, fig. 1), have a dense tuft of camerated 

 bristles finely tapered (Plate LXXXV, fig. 8) and a stout dorsal cirrus, then an interval 

 devoid of appendages. The inferior division has a more or less complete series of similar 

 though shorter bristles, and also of broken shafts with rounded tips, more or less modified 

 so as to perform the functions of stout spines (Plate LXXXV, fig. 8 a), whilst the majority 

 of the anterior feet have pale or slightly yellowish bristles in the inferior division; the 

 last three have about four dark brownish hastate spines with long tips (Plate LXXXV, 

 fig. 8 b). The row of papillae behind these feet is separated by a considerable interval 

 from the bristles, so that the foot has a character of its own. Rows of papillae occur on 

 the ventral surface of bristled segments thirteen, fourteen, fifteen, and sixteen, and it may 

 be partially on one or two others behind. 



The change in the form of the foot takes place about the seventeenth, and at the 



121 



