DALHOUSIELLA CARPENTEBI. 135 



Synonym. 



1901. Dalhousiella Carpenteri, Mcintosh. Ann. Nat. Hist., ser. 7, vol. viii, p. 231, pi. i, f. 9 



and 10. 



Habitat. — Dredged in the ' Porcupine ' Expedition of 1870, at Station 9, on the 

 Channel Slope, lat. 48° 06' N., long. 9° 18' W., in 539 fathoms, on a bottom of grey mud. 

 It accompanied Leocrates atlantica, which, like Ophiodromns and other Hesionidae, has a 

 fondness for mud — often of a most tenacious description. 



Head (Plate LVIII, fig. 18) agrees with the type observed in Dalhousia of the 

 6 Challenger ' Expedition, and also with that in Leocrates, though the median tentacle is 

 absent. The tentacles appear to be about the length of the palpi, which have a short 

 terminal segment. A deep median furrow separates the rounded lobes on which the large 

 and closely approximated eyes are situated. The preparation shows less disproportion 

 than usual between the anterior and posterior eyes, but it is not good. Eight pairs of 

 tentacular cirri, with spines, occur on the buccal and following segments, and they appear 

 to have long and slightly moniliform tips, as in allied forms. 



Body of the typical form, about one and a quarter inches long (in spirit) and with 

 seventeen bristled segments. The posterior end appears to be injured, though two short 

 cirri occur beneath the vent. The papilla under the snout is small or little elevated. 



The proboscis has a firm wall and a glistening interior surface, but, though the parts 

 in the mid-dorsal line are dense, no distinct teeth are present. 



The shape of the feet is uncertain in the preparation, but they are long, and appear 

 to diminish more towards the outer edge than in Leocrates. The dorsal cirrus arises 

 somewhat behind the ridge of the foot, has two very small black spines at the base, and 

 is long, tapering, and slightly moniliform. No dorsal bristles existed in the preparation. 



The setigerous region tapers towards the outer extremity, where a papilla occurs. 

 The spine is black and powerful. The bristles (Plate LXXVIII, fig. 7) have comparatively 

 short shafts which are minutely striated longitudinally and transversely (internally) as 

 in allied forms. When seen on edge the tips of the shafts are somewhat fusiform, from 

 the dilatation below the bevelled region. In lateral view, though the diameter is greater, 

 the dilatation is less pronounced and the striae are now oblique. The terminal blade is 

 comparatively short, has a web connecting its bevelled base with the shaft, is slightly 

 curved, and tapers very little to the deeply forked (longitudinally split) terminal region. 

 The dorsal limb of the fork, viz. that opposite the serrated edge, is the longer, but is 

 frequently broken. It is proportionally longer in the upper bristles of the tuft. The 

 edge of the blade is minutely spinous, even up to the base of the fork. The ventral 

 cirrus is slender and subulate, stretching beyond the tip of the setigerous process. The 

 structure of this bristle would seem to be diagnostic, for though that of Stepha.nia flexuosa 

 of Delle Chiaje, 1 as figured by Claparede, 2 is a step in its direction, yet not even uniform 

 and continuous friction could make it resemble that of the present form, and this difference 

 would suffice without referring to other distinctive characters of the species. 



1 'Mem. degli Anim. s. Vert./ II, pp. 308, 401 and 424, tav. xix, fig. 8; ' Descriz. e Not./ Ill, 

 p. 97 : V, p. 103, tav. cxxix, fig. 8. 



2 ' Suppl. Annel. Neap./ 1870, p. 118, pi. xii, fig. 1. 



