86 ANNELIDA. 



men," observe that the uncini and the capillary setae stand in 

 the reverse order. 



4. Find the ventral shield-glands. A furrow (sulcus or 

 faecal groove) divides them into pairs toward the posterior end 

 of the worm. 



A draining is desirable. 



HYDROIDES. 



This is a member of the family Serpulida?. Study living 

 specimens and their heavy calcareous tubes. Notice the banded 

 branchiae (modified palps) and the dorsally placed operculum, a 

 modified gill filament. Look for "eyes" on the gill filaments. 



A drawing is desirable. 



SPIRORBIS BOREALIS. 



This animal is also a member of the family Serpulida?. 

 Specimens are -very abundant along the shore, attached to Fucus. 



1. Study the tube and notice the way in which it "parallels" 

 the form of a small snail-shell. 



2. Remove a live specimen from the Fucus on which it grows 

 and crack the tube away with a needle. Study the animal in 

 a watch-glass with a low power. Identify the gills, the opercu- 

 lum (which serves as a "brood-pouch"), the setce, and the collar. 

 Are there any "eyes" on the gills? 



3. Study the egg-strings which are lodged in the tube, and 

 the young embryos which are to be found in the brood-pouch. 



A drawing is desirable. 



GEPHYREA. 



PHASCOLOSOMA. 



This form is commonly found buried in sand between tide- 

 marks. Specimens sometimes occur on the same flats with 

 Nereis, but they are generally more abundant where the mud is 

 of a slightly different, more sticky character. 



1. Handle a living specimen and see how turgid it is. If 

 you touch a specimen that has been allowed to expand in a dish 



