788 MISS HELEN PIXELL ON 



I'iclges beaiing the tori being especially deep in colour. Ab- 

 domen pinkish ; there is a short anterior asetigerous region, and 

 postei'iorly nearly covering the last centimetre or so of dorsal 

 surface is a chalky white strap-shaped raised glandular area. This 

 is the terminal dorsal gland mentioned by St. -Joseph (24) as 

 possibly serving in the construction of the tube. It tapers 

 -anteriorly and ends abruptly postei'iorly just above the vertical 

 slit-like anus.* Along nearly the whole of this glandular region 

 the ordinary abdominal set?e are replaced by fascicles of abovit five 

 slender capillary setse without blades and nearly equal in length 

 to the width of the abdomen at this place. The collar is entire 

 ventrally and has a deep incision on each side — the lateral lobes 

 being continuous with the wide thoracic membrane. 



The functional operculum is large and transparent and caiuied 

 by the second branchia from the dorsal side. The pedicle is 

 generally coiled twice like the other gills ; except in very young 

 specimens there is a small club-shaped one terminating the 

 branchia on the opposite side. 



All the collar setfe and most of the other thoi-acic setae have 

 simple narrow blades ; amongst them in the posterior thoracic 

 fascicles are to be found a few of the typical bladed sickles 

 "(fig. 4 c). The abdominal setae are more or less sickle-shaped, 

 though they easily become folded (figs. 4 d, e) or straightened 

 out. 



Several of the specimens examined were much smaller and 

 obviously young forms, with 70, 83, 101, 114 abdominal segments 

 and fewer branchiae than in adult specimens. 



Genus Protula Risso (23), 1826. 



Generic characteristics : — 



1 . No operculum. 



2. Collar setae simple tapered blades (fig. 5 h). 



3. Terminal dorsal gland present. 



5. Protula pacifica, sp. n. (PL LXXXYII. figs. 5 a-5f.) 

 Specific characteristics : — 



1. Ventral lobe of collar notched. 



2. Abdominal setae somewhat sickle-shaped in the anterior 



region, narrow terminal bladed ones posteriorly. 



3. Uncinigerous tori extend from segment 3 to the end of the 



abdomen. 



4. XJncini with numerous small teeth, the posterior one long 



with a bulbous exti^emity (fig. Sy). 



5. Thoracic setae simple blades with sometimes a few setaj of 



Apomatus posteriorly. 



* In section the gland is seen to consist of epithelial cells crowded with spherical 

 granules which stain easilj' with iron hajniatoxj-lin but not with Delafield's. The 

 igland is appaventlj^ unchanged bj' the presence of acid in the preservatives and 

 "therefore does not appear to be calcareous. 



