REPOET ON THE ANNELIDA. 
49 
Unfortunately the dorsal spines had almost disappeared. Only a single short 
(developing) spine occurred at the posterior third of one specimen. It resembles that of 
the previous form, having four teeth on one side and three on the other (PI. Ya. fig. 3). 
Its colour is somewhat lighter than in Lcetmonice producta, var. henthaliana, being of a 
golden brown. The shaft, as in the latter, j)ossesses many prickles. In a specimen from 
the north-east coast of New Zealand the dorsal spines showed three teeth on each side. 
The ventral bristles are also much broken, and they differ from those of Lcetmonice 
producta, var. henthcdiana in being somewhat more slender, and in having the pinnae next 
the hook (PL Va. fig. 4) much more elongated. Only one or two of the inferior pinnae are 
slightly thickened. These pinnae are also proportionally longer, especially towards the 
tip, than those of Lcetmonice producta, var. wyvillei. The transverse striae in the shaft are 
very closely arranged, and appear to be more regular and distinct than in any of the 
former. In some of the larger examples the posterior edge of the tip shows minute 
roughnesses. Occasionally the spur is bifid. The shafts also appear to be angular, 
especially in mounted preparations. 
The dorsal cirri are somewhat longer than in Lcetmonice producta, var. ivyvillei, but 
the ventral are similar. The foot is also more gibbous at the base. 
The siphonic curve of the alimentary region behind the proboscis is well marked in the 
specimens. The intestine contained greyish mud composed of Foraminifera, fragments 
of minute Crustacea, perforated calcareous plates like those of the Polyzoa, sponge-spicules, 
and debris. 
It is very interesting to notice the closeness with which the three forms, viz., this, 
the var. henthaliana and the var. wyvillei approach each other ; yet, after careful con- 
sideration, it is no easy matter to unite them. The differences in external appearance, 
in the cephalic appendages, and in the structure of the bristles which characterise 
each, are so well defined that, with the evidence at command, separation might have 
been pardonable, but it has been thought prudent at present simply to make them 
varieties of the typical form. The difference in size of the respective forms is also 
noteworthy. 
Lcetmonice p)roducta, var. assimilis (PI. VIII. fig. 2; PI. Va. figs. 5-8). 
Dredged at Station 49 (south of Halifax, Nova Scotia), May 20, 1873; lat. 43° 3' N., 
long. 63° 39' W.; depth, 85 fathoms; bottom temperature 35°'0, surface 40°'5; gravel 
and stones. The fauna of this region very much resembled that of the mouth of the 
river St. Lawrence, Canada. 
This form closely approaches several of its congeners, but shows certain differences 
which merit special notice. The length is about 35 mm. and its breadth (exclusive of 
the bristles) 15 mm. The segments are about thirty-five. 
(ZOOL. CHALL. EXP. PART XXXIV. — 1885.) LI 7 
