316 CEYLON PEARL OYSTER REPORT. 



abdomen may be due to regeneration. Between the whorls of the operculum a small 

 Annelid was found by Mr. Hornell (see Haplosyllis spongicola). 



Protulopsis palliata, n. sp. Plate VII., figs. 183 to 185. 



Associated in the trawl with PhyllochcBtopterus ramosus from Galle, Station 

 XXXIX., 16 to 30 fathoms. 



A round, slightly curved calcareous tube, attenuated behind, widened in front. The 

 body without the gills is 19 millims. long, 3 millims. maximum diameter. Gills with 

 between 30 and 40 radioles on each side, rolled inwards in a single spiral turn ; no 

 operculum. Thorax consists of seven segments carrying seven pairs of capillary 

 fascicles, but I do not find the uncini commencing before the fourth segment. The 

 first fascicle contains numerous limbate capillary setae of the usual form. In the 

 fourth fascicle, in addition to the ordinary setae, there is a group of salmacine seta? 

 (Plate VII., fig. 183). There are about twelve of this kind of setae in the fascicle, 

 characterised by a short normally limbate tract followed by a clear striated border 

 extending to the tip of the seta. The striated border is not limited by a refringent 

 edge ; the latter ceases suddenly at the upper end of the limbus. The uncini show 

 about twenty equal denticulations ; the last tooth at the base of the uncinus is 

 followed by a long characteristic spur (Plate VII., fig. 184). The abdominal setae 

 occur to the number of five in a fascicle (Plate VII. , fig. 185). The collar, in com- 

 bination with the thoracic membrane, shows a remarkable development dorsally, where 

 it is produced forwards on each side into a wide lappet, which is rolled upon itself 

 and is probably able to follow the branchial spire to its termination ; the ventral 

 portion of the collar is marked off from the dorsal portion by an incisura lateralis, 

 and its ventral border is slightly concave. 



Serpula granulosa, Marenz. Plate VII., figs. 186 and 186a. 



Von Marenzei.ler, ' Siidjapan. Ann.,' ii., 1884, p. 215 (p. 19 of reprint). 



Locality : South-west Cheval Paar ; several specimens. 



Tube round, subcristate to cristate ; fila branchialia (radioles) about 26 on each 

 side* ; operculum shallowly concave, with 46-52 rays which project as denticulations 

 at the margin. The grooves which separate the rays do not all reach to the centre 

 of the disc ; they are the superficial indications of dissepiments which project 

 vertically with a free inner border into the substance of the operculum (Plate VII. , 

 fig. 186a). Seven thoracic segments ; modified setae of the first segment unequally 

 bifurcate ; capillary setae of the other thoracic segments simple, limbate ; thoracic 

 uncini 5-dentate. Serpula granulosa differs from S. yervaisii, Qfg., by its cristate 

 tube and the shallow cup of the operculum. The degree of concavity can be varied, 

 sometimes the disc is nearly flat, sometimes slightly convex, but it does not seem 

 likely that it could be deepened to the extent which characterises S. gervaisii.f 



* Vo\ Marenzeller gives 35 for the type. 



t Cf. Grtjbe, 'Ann. Roth. Meer.' (Frauenfeld), 1868, p. 640. 



