Gatfy Marine Laboratory, St. Andrews. 127 



seven segments, each almost symmetrically divided by four 

 rows of golden bristles with a double curve and winged tips. 

 At the ninth segment hooks take the place of the bristles, 

 and the winged forms have two minute spines above the 

 main fang in lateral view, and this arrangement continues 

 to the posterior end, though the caudal hooks are smaller. 



Fragments apparently of the anterior third of a form near 

 Dasybranchus were dredged by Dr. Gwyn JeftVeys in 80-100 

 fathoms in muddy sand in St. Magnus Bay, Shetland, in 

 1867. In what seems to be an anterior fragment the 

 ventral ridges for the hooks extend round the edges of the 

 flattened body to the dorsal surface, where they cease. No 

 hooks could be found dorsally, and therein it differs from 

 Dasybrajichus. The dorsal surface is rounded and lobed, 

 and the walls are so attenuate that in certain fragments the 

 muddy contents and the orange hue of the gut-wall shine 

 through. The ventral surface possesses thick walls and is 

 flattened in front, with a median ridge, which is absent from 

 the posterior fragments, which are only ridged transversely. 

 The hooks are minute, have a very short main fang with two 

 teeth above it (in lateral view). The ventral longitudinal 

 muscles are greatly developed. 



6. Or/, the Ca^iteWidx pro cured by H.M.S. 'Porcupine.' 



Dasybranchus caducus, Grube ? Dredged in the * Por- 

 cupine ' Expedition of 1870, in the Bay of Tunis. Some of 

 the fragments are about 4 inches in length and 6-8 mm. in 

 diameter. It is distinctly tapered anteriorly, gradually 

 enlarges toward the middle, and again probably tapers 

 posteriorly, but as the specimen is incomplete this is 

 conjectural. 



The head forms a short, blunt cone, which, in the pre- 

 paration, is partly withdrawn into the peristoraial segment, 

 which is marked dorsaliy by a somewhat regular series of 

 longitudinal strise over an eminence. Ventrally the proboscis 

 is extruded as a short cylinder Avith a corrugated and 

 slightly glistening surface. In the preparation the peri- 

 stomial segment forms a blunt cone, and, besides the 

 eminence, a diff"erentiation of the longitudinal stria3 a little 

 in front of the middle dorsaliy and the presence of a 

 transverse depression may indicate a sensory organ. Whilst 

 this segment is undivided ventrally, a deep furrow dorsaliy 

 cuts oft' a posterior belt. Such may be an indication of the 

 arrangement of the succeeding rings. The segment following 



