Gatty Marine Lahorafori/, St. AivJrexos. 05 



hooks is intimately associated ^ith its dorsal edge. No 

 other hook or bristle is connected with it. 



The dense rows of hooks are situated on the edge of the 

 prominent lamellae. Each has a short base or shaft and a 

 well-marked rounded crown, with a smaller and a larger 

 facing beneath, the curve below the latter sloping to a 

 modified tooth with a spinous edge, then a gulf below and 

 a rounded prow, the basal line being ^.lightly sinuous. 



The caudal appendix (scapha) presents dorsally an almost 

 evenly truncated edge in a line with the general surface, the 

 margin, however, being minutely crenulate and projecting a 

 little beyond the dorsal surface of the appendix. Then 

 follows the line of caudal hooks which abut at their ventral 

 edge on the rounded and flattened lamella with the cirrus. 

 A notch separates the ventral edge of the lamella from a 

 series of four fimbriae between it and the vent, the lower 

 edge of which is crenate with a subulate median cirrus, 

 Nilsson * has recently shown the structure of the eyes of 

 this organ. 



The caudal hooks are slightly narrowed at the base of the 

 striated shaft, then dilate, continue for some distance with 

 nearly parallel sides, diminish toward the neck, and end in 

 a slight curvature at the point, which is somewhat blunt, 

 probably from friction. 



The tube is slightly curved, and in ^Malmgren's examples 

 was composed of minute shells, viz. Rissoa striata and Bulla 

 truncata. Tubes from the coast of Kerry are composed of 

 comparatively large fragments of shells and stones and a 

 minute Rissoa. Those from 422 fathoms off Ireland in the 

 * Porcupine'' Expedition of 18G9 were formed of proportion- 

 ally large translucent grains of quartz with here and there 

 a yellow and black grain of other material. One fragment 

 is composed of Foraminifera with a few grains of sand, but 

 its identity is uncertain, A tube from 567 fathoms in the 

 Atlantic, in the ' Porcupine' Expedition of 1870, presents 

 a uniform series of dull yellow grains throughout. The 

 rounded and comparatively large yellow stones forming a 

 tube from a depth of 52^, fathoms (log 33) off" the south- 

 west of Ireland are noteworthy. 



Mr.Crawshay flunks Gcmmill's record is the first in Britain, 

 but such is not the case. 



* Beitrtige Nerveiifiyst. Polvch, Zool. Bidrag Uppsala, Bd. i. p. 137 

 (1912J. 



