796 MISS HELKx mxEhij ox 



Specific cliai-acteiistics : — 



1. Last tlioracic segment on the riglit lias no dorsal setse, 



2. Collar setae with fin-like expansions at base of deeply serrated 



blades. 



3. Some setae of third segment bladed sickles, 



4. Embryos incubated in the tube. 



This species was quite common on stones and rocks from the 

 ]3eparture Bay region and from Victoria. 



The tubes vary a good deal but are always translucent, with 

 the whorls piled on one another. The whole tvibe measures 

 about 2'5 mm. in diameter and the aperture about 1 mm. across. 

 There are various markings on the exterioi". Sometimes a 

 ridge along the median line ends in a sharp projection above 

 the aperture — in the grooves on either side of this there may 

 or may not be scalai'iform markings. Young specimens have 

 shells as figured for this species by Levinsen (10. fig. 11), older 

 ones were ridged more like /Sp. cancellatas (10. fig. 18). The living- 

 animals were bright pink in colour. Gills 7, each with six pairs 

 of long opposite pinnse, opercular plate a shallow funnel. About 

 20 abdominal segments. 



Sub-genus Dexiospira (Caullery & Mesnil, 1897). 

 Characteristics : — 



1. Tubes dextral. 



2. Thorax with 3 setigerous segments. 



8. Sptrorbis spirillum Linne, 1767. (PI. LXXXVIII. 

 figs. Sa-8c.) 



Serpula spirillum Linne (12), 1767 ; Fabricius (7), 1780. 

 Sjnrorhis spirilluvi Malmgren (14), 1867 ; Levinsen (10), 



1883; Caullery & Mesml (5), 1897; Moore (17), 1902; 



Bush (3), 1905. 

 Spirorhis lucidas Montagu (16), 1803; Morch (20), 1863; 



Malmgren (14), 1867. 

 Circeis armoricana Saint- Joseph (24), 1894. 

 ISpirorhis borealis Fewkes (8), 1885. 



Specific characteristics : — 



1 . Collar setse geniculate (fig. 8 c). 



2. Operculum without brood-pouch. 



3. Concave plate of operculum has a slight projection (talon) 



on under side. 



Two varieties of this species were fairly common in the Departure 

 Bay region and at Victoria, growing on calcareous polyzoa, 

 seaweeds, etc. The discoid form grows only on smooth surfaces, 

 Laminarian thalli being often extensively covered with specimens. 

 These were very flat, regularly coiled tubes — -the spiral with 

 1| to 3 coils measuring "5 to 2 mm. in diameter (fig. 8 a). The 



