i68 DISCOVERY REPORTS 



Henricia pagenstecheri parva (Koehler) 



Cribrella parva Koehler, 1912, p. 40, pi. 4, figs. 3, 8. — 1920, p. 118, pi. 25, fig. 10; pi. 26, figs, i-ii ; 

 pi. 66, fig. 4. 



St. 170. Off Cape Bowles, Clarence Island, South Shetland Islands, 61° 25' 30" S, 53° 46' W, 

 342 m., rock, i specimen. 



St. 1948. North-east of Clarence Island, 60° 49-4' S, 52° 40' W, 490-610 m., i specimen. 



This race is close X.o pagenstecheri from which it differs chiefly in having sUghtly larger 

 abactinal plates carrying upward of 10 small spinelets which, hke those of the South 

 Georgia species, are minutely thorny. The adambulacral spinelets are not particularly 

 different from those oi pagenstecheri other than being slightly more numerous. Ordinarily 

 there are 5 or 6 subambulacral spines in a single transverse series, the 2 ranks of combs 

 on either side of furrow forming a prominent cheval-de-frise. But on the first 2 or 3 

 plates there are 7 or 8 spinelets in 2 complete or incomplete series. Here and there the 

 adambulacral armature is aligned with the actinal and inferomarginal spinelets which are 

 in close-set groups of 3-8 and do not form regular longiseries. The small single papulae 

 extend to the adambulacral plates. 



The specimen from St. 1948 measures R 22 mm., r 6 mm., br 6-5 mm. 



The example from St. 170, measuring R 18 mm., r 4-5 mm., br 5 mm., is not at all 

 typical in respect to adambulacral armature. The plates of the proximal half of ray in 

 addition to a prominent furrow spinelet (or occasionally 2) have 7-9 subambulacral 

 spinelets, arranged in the equivalent of 2 transverse series as a rule, but very irregularly 

 so. Far along ray there is often a transverse series of 3 spines and a group of 3 or 4 

 smaller spinelets on the outer part of plate. 



Koehler (1920) reported parva from off Adelie Land and Queen Mary Land, iio- 

 151 fathoms. Abactinally, these resemhle pagenstecheri quite as much as they do parva. 



Type locality. Admiralty Bay, King George Island, South Shetlands, 420 m. 



Distribution. Antarctic, circumpolar; 191-610 m. 



Henricia simplex (Sladen) 

 (Plate XI, fig. 3) 

 Cribrella simplex Sladen, 1889, p. 547, pi. 97, figs. 5, 6; pi. 98, figs. 9, 10. 



St. 1564. Oft' Marion Island, 46° 36-5' S, 38° 02-3' E, 108-113 m., i specimen. 



The specimen measures R 36 mm., r 8 mm., br, beyond constriction, 10 mm. The 

 photographic figure is introduced to indicate wherein this relatively large specimen 

 varies from that illustrated by Sladen. There are usually 4 subambulacral spines in 

 a single transverse series and these combs are aligned with the i or 2 actinal and 2-4 

 inferomarginal spinelets. The actinal plates extend about one-third length of ray 

 measured on side. The superomarginals are not well marked except on outer third of 

 ray ; at the base of ray they are separated from the inferomarginals by a lateral wedge- 

 shaped area of intermarginals — 3 or 4 plates wide at interradius. The lowermost regular 

 series of papulae lies just under the superomarginals on the lateral face of ray. There are 



