310 CEYLON PEARL OYSTER REPORT. 



between the ninth and tenth ventral shields and passes round to the dorsum obliquely 

 between the eighth and ninth capillary fascicles (Plate VII., fig. 173). The total 

 length of the smaller worm is about 70 millims., of which nearly 7 millims. go to the 

 thorax, 20 millims. to the gills. 



Eurato notata (Grube) Plate VII., figs. 174 to 176. 

 Sabella notata, Grube, 'Ann. Semp.,' 1878, p. 256. 



A small worm in a finely encrusted closely investing tube was associated with 

 Phyllocluetopterus ramosa from Galle. The worm could only be removed from its 

 tube with difficulty and not without damage, the gills adhering closely to it and to 

 each other. The gills, with about 12 radioles in each, are banded with purplish 

 colour, but the bands are all obscure in the preserved state with the exception of the 

 basal band formed of a row of elongate dense purple spots, one on each radiole placed 

 immediately in front of the level at which the radioles pass into the basal membrane 

 which supports them. This is the first feature to meet the observer on removing the 

 animal from its tube. The next distinction is afforded by the presence of a pair of 

 subtriangular or pear-shaped pigment aggregates on the dorsal side of the first 

 segment above the capillary fascicle, the apex directed forwards ; this no doubt 

 corresponds with the C-shaped mark which Grube noticed on his specimen. A 

 pigment patch occurs on each side of the succeeding segments between the groups of 

 setae and the uncini, i.e., between the fascicles and the tori. 



In this specimen the thoracic segments were abnormal, fewer than normal and 

 fewer on one side than on the other. Similar variations have been described in 

 several Sabellidae by the Baron de St. Joseph. On the left side there are three 

 thoracic tori, on the right side four. In side view of the uncini three rows of teeth 

 are to be seen on the vertex (Plate VII., fig. 174). The capillary setae are all limbate, 

 some long-limbate, others short-limbate and some rather wide-limbate (Plate VII., 

 fig. 175). The limbus of these setae is a kind of guard upon one surface embracing 

 the setae. From some points of view the seta appears bilimbate, but when the shaft 

 is broken across, the limbus may be left projecting far beyond the broken edge 

 (Plate VII, fig. 176). 



The total length of the worm is about 125 millims., of which 2 "5 millims. belong to 

 the gills ; width 1 millim., length of tube nearly 20 millims. The collar of this 

 species is only conspicuous ventrally, where it is represented by a pair of ventro- 

 lateral lobes, broad lappets subacute in front at the outer angles ; these are what 

 Grube called the laciniae ventrales. Grube's was a larger example and the propor- 

 tion of the length of gills to body-length differs from that of the Ceylon representative. 

 Another fragment of a larger individual was obtained on east side of Cheval Paar, 

 and also showed clearly 4 thoracic tori on the right side, 3 on the left. The marks 

 on the pronotum are C-shaped, with the concavity directed forwards and inwards. 



