WIGLEY and STINTON: REMAINS FROM MARINE SEDIMENTS 



Table 2. — Occurrence, by station, of the remains of three 

 species of echinoderms. Present ( + ), absent ( — ). 



Station 

 number 



E china 



rachntus 



parma 



Brisaster 

 jragilis^ 



Strongylo- 



ctntrotus 



drobachensis 



1 May include some frogments of Echinocardium or Schizasttr. 



from the inshore zone, shells from deep water 

 appeared old and worn (Figure 3B). The char- 

 acteristics of specimens from the area between 

 the two depth zones were intermediate. 



OTHER SPECIES 



Brisaster fragilis (Figure 3C) was distrib- 

 uted in a broad east-west band along the outer 



7.I' I 



41* 



.BLOCK 

 ISLAND -, '■ 



~40 - '~. 



. 60 



40'-' 



, 7,0' 



J^— ' L_r4 



, - UABTHA'S UIWEVABD 



NANTUCKET 



U II 



/ ' \ 



» '.-> * 



'"-V / ' ' 



-41* 





IPOO METERS ECHINARACHNIUS PARMA 



k::::] light color, larger size, angular edges 



f^ intermediate 



fz/i dark color, smaller size, rounded edges 



T jV^i I I T- 



7'0' 



trS I I" 



40* 



Figure 4. — Geographic distribution of remains of tests 

 of Echinarachnius parma. Three categories of size, 

 color, and sphericity are shown separately. 



continental shelf and upper slope (Figure 5). 

 The fragments were generally small and scat- 

 tered. Even when all species are considered as 

 a group, only a few spines or test fragments oc- 

 curred in any one sample. Range in water depth 

 for this echinoid was 90 to 366 m. Water depth 

 range is compared with that of other species of 

 echinoderms in Table 3 and illustrated in Fig- 

 ure 6. 



The green sea urchin, Strongylocentrotus 

 drobachiensis (Figure 3D), was represented 

 chiefly by spines and less commonly by test frag- 

 ments. The remains were rather widely scat- 

 tered among six stations; two were in the 



Table 3. — BathjTnetric distribution of three species of 

 echinoderms and the number of stations at which each 

 occurred. 



1 May include some spines of Echinocardium and Schizaitfr. 



