434 THE VOYAGE OF H.M.S. CHALLENGER. 



tudinal rows, one directed over the furrow and the other outward. Occasionally one of 

 these spinelets may be replaced or accompanied by one of the large cat's-paw-like forfici- 

 form pedicellarise. 



The plates of the inner row of actinal intermediate plates, adjacent to the adambu- 

 lacral plates, bear one short, robust, obtuse spinelet, rather larger than the spinelets on 

 the abactinal plates ; and the plates of the outer row (at least on more than the inner 

 half of the ray) bear two similar spinelets, placed side by side and rather oblique. On 

 the intermediate row, when this is present, there may be one spinelet like those on the 

 inner row, or occasionally near the base of the ray two spinelets like those on the outer 

 row of plates. On the membrane which covers these plates are numerous, but distinctly 

 spaced, sessile, forcipiform pedicellaria? and occasionally one of the large cat's-paw-shaped 

 forficiform pedicellarise. 



In the armature of the mouth-plates there are several of these large pedicellarise, and 

 in the median actinal interradial area reaching from the mouth-plates to the margin are 

 several large pedicellaria? of the same pattern, wide apart ; and no other appendages of 

 any kind are present on the membrane in this region. 



The madreporiform body, which is small, occupies the central half of one of the basal 

 plates, and its circumference is surrounded by irregularly placed spinelets. It is situated 

 nearer the centre than midway between that point and the margin. 



The anal aperture is distinct. 



The ambulacral tube-feet are crowded, and form four rows. 



Colour in alcohol, a brownish ashy grey, or a slightly orange yellow. 



Localities. — Station 142. South of the Cape of Good Hope. December 18, 1873. 

 Lat. 35° 4' 0" S, long. 18° 37' 0" E. Depth 150 fathoms. Green sand. Bottom tem- 

 perature 47°'0 Fahr. ; surface temperature 6 5° 5 Fahr. 



Simon's Bay, Cape of Good Hope. Depth and conditions not recorded. 



Remarks. — This species presents some superficial resemblance to Stichaster auran- 

 tiacus, but is readily distinguished from that form and all the other members of the genus 

 by the character of the spinulation of the plates and by the presence of the remarkably 

 large and strangely shaped forficiform pedicellarise. 



A slight difference may be noticed in the spinulation of the marginal plates in the 

 examples from Simon's Bay as compared with one from Station 142, the spinelets being 

 more numerous and more grouped in the former. The difference is so slight that I do 

 not consider further remark necessary. The example from Station 142 has also rather 

 more robust rays. 



6. Stichaster polygrammus, n. sp. (PI. C. figs. 1-3 ; PI. CIII. figs. 5 and 6). 



Pays five. P = 79 mm. ; r = 10 mm. R< 8 r. Breadth of a ray at the base, 12*5 mm. ; 

 breadth about midway between the base and the extremity, 10 mm. 



