NO. 2 HARTMAN, BARNARD: BENTHIC FAUNA OF DEEP BASINS 1 13 



Key to species 

 1. Branchiae present 2 



1. Branchiae absent 5 



2. Fifth segment modified and provided with thick hooks 

 Polydora sp. 



2. Fifth segment not modified 3 



3. Branchiae present on many segments . Laonice sacculata 



3. Branchiae limited to a few anterior segments ... 4 



4. All branchiae bipinnately divided (Plate 9, fig. 1) 



Prionospio pinnata 



4. All branchiae cirriform .... Prionospio cirrifera 



4. Branchiae partly pinnate, partly cirriform . Prionospio spp. 



5. Prostomium with laterally directed horns at anterior end 

 Spiophanes anoculata 



5. Prostomium without laterally directed horns ... 6 



6. Prostomium with a median antenna inserted between palpal 

 bases; genital spines present from neuropodium 15 

 Spiophanes fimbriata 



6. Prostomium without a median antenna ; genital spines present 

 from neuropodium 10 . . . . Spiophanes pallidas 



Genus LAONICE Malmgren, 1867 



Laonice sacculata ( Moore) 1 923 

 Spionides sacculata Moore, 1923, pp. 184-185. 



A specimen from Santa Cruz Basin agrees with the original account 

 in that the prostomium nearly lacks eyes and interramal pouches are 

 first present from segment 30. Branchiae occur on setigerous segment 2 

 through about 50 segments. The dorsal transverse membranes are incon- 

 spicuous except over the notopodial lobes. 



The type specimen, as Spionides sacculata, from Monterey Bay in 

 222 fms, has been reexamined. It measures about 57 mm long by 6 mm 

 across and is posteriorly incomplete. The prostomium nearly or altogether 

 lacks eyes. Lateral parapodial pouches are present from setigerous segment 

 29-32. A narrow median nuchal ridge extends back from the prostomium 

 to segment 24. Branchiae number about 55 pairs, after which they dimin- 

 ish through another 10 segments and are absent from about segment 65. 

 Hooded hooks are first present in neuropodia of segment 55 ; they replace 

 most of the pointed setae and occur in transverse series; they are accom- 



