NO. 2 HARTMAN, BARNARD: RENTHIC FAUNA OF DEEP BASINS 123 



Genus TELEPSAVUS Costa, 1861 



Telepsavus costarum Claparede, 1870 

 Fauvel, 1927, p. 82, fig. 28. 

 Berkeley and Berkeley, 1952, p. 63, figs. 127-130. 



A few small fragments were taken in San Pedro and Santa Cruz 

 Basins. This is more typically a shallow water species, known from 

 cosmopolitan areas. It is characterized by a very slender, translucent, 

 neatly annulated tube measuring 1 to 2 mm across and 100 mm or more 

 long. The modified fourth segment has a single large dark spine on either 

 side. 



In southern California, Telepsavus costarum reaches its greatest 

 concentrations on shelf and upper slope depths, in sediments of sandy silts. 



Family CIRRATULIDAE 



Six species in 4 genera are represented ; they may be identified accord- 

 ing to the following key. 



Key to species 



1. Long tentacular filaments (= branchiae) numerous . . 2 



1. With a single tentacle inserted anteromedially . Cossura spp. 



2. Setae entirely slender, limbate and distally pointed . . 3 



2. Setae partly acicular or spinelike 4 



3. Body larger, not moniliform, inhabiting tubes (Plate 11, fig. 1) 

 Tharyx tesselata 



3. Body smaller, moniliform (Plate 12, fig. 2), without tubes 

 Tharyx monilaris 



4. Neuropodial spines distally entire and acicular ... 5 



4. Neuropodial spines distally finely serrated 



Caulleriella gracilis 



5. Neuropodial spines not present before middle region of body ; 

 prostomium usually without eyes . . Chaetozone spinosa 



5. Neuropodial spines first present at segment 24 and notopodial 

 spines from about segment 64 . Chaetozone nr. spinosa 

 5. Neuropodial spines present in most or all body segments; pro- 

 stomium with or without eyespots . . Chaetozone corona 

 Discussion — Three closely related genera, Chaetozone, Caulleriella 

 and Tharyx, are represented in the basins in considerable numbers of 

 individuals. They usually come up as fragments from deep grabs and 

 are to be distinguished from one another only by examination of micro- 



