204 DISCOVERY REPORTS 



the adambulacral combs have not yet become differentiated whereby alternate fans 

 project farther into the furrow. Except for a rather wider actinolateral membrane this 

 specimen resembles an equal-sized young of D. verrucosus (St. WS 210) which like- 

 wise lacks any marked differentiation of alternate adambulacral combs and has only 

 incipiently quadriserial tube-feet. 



Unfortunately the adult specimen, as well as a medium sized one, is incomplete 

 through maceration. The size before softening was probably close to R45mm., 

 r 22 mm. The supradorsal membrane is thick and verrucose as in D. verrucosus. Near the 

 centre of disk the paxillae have 8-10 long slender peripheral divaricate spinelets and an 

 obviously stouter central one surmounting a slightly longer slender pedicel, which is 

 longer in interradii than on radial area ; on outer half of ray the pedicels rapidly shorten 

 and there are commonly 8 peripheral spines. 



Along the only complete series of adambulacral plates the spine counts run as follows : 

 mouth-plates 5, first adambulacral 4, then 5, 5, 4*, 5, 4*, 5, 4*, 4, 4*, 4, 4*, 4, 4*. etc 

 The " recessive " series are marked *. When the prominent series has 4 spines, the furrow 

 member is nearly as long as the second spine, while in the recessive series it is usually 

 less than half as long. The suboral spine is long and slender, close to the innermost 

 marginal oral spine to which it is united by a web (not present in the other 2 specimens). 

 The web of the first adambulacral series is continued across interradius uniting with the 

 other first series, behind mouth-plates. The two second series nearly meet. 



It should be noted that Sladen's type of reticulatus was immature, that it already 

 showed a reticulate dorsal membrane and crowded tube-feet. The differentiation of the 

 adambulacral combs is not at all obvious in D. verrucosus until R is 20 mm. It is not 

 apparent in specimens as small as the type of D. reticulatus. 



This species is closely related to verrucosus and multipes. D. perigrinator (Sladen) 

 from off Kerguelen has furrow combs of 7 or 8 spines alternating with combs of 5. But 

 it will not be surprising if the three ultimately prove to be forms of one species. 



Type locality. Off Marion Island, 69 fathoms, volcanic sand. 



Family BRISINGIDAE G. O. Sars 



Genus Odinella nov. 



Diagnosis. Related to Odinia but differing in having a more specialized genital 

 region confined to first 4 skeletal arches, the intervals between which are without plates 

 on sides of ray; first intercostal area laterally modified in female to form part of a 

 specialized axillary brood chamber ; saccuU of lateral and some of abactinal spines of ray 

 extremely thick, ovoid to subglobular in form. Papulae appearing late, not numerous, 

 confined to disk and genital region; pedicellariae very small, confined to sacculi and 

 absent from abactinal area of disk ; gonads 2 to each ray, opening laterally in first inter- 

 costal space ; interradial plate (odontophore) hidden by abactinal integument of inter- 

 brachial angle; first post-oral adambulacral of each mouth angle closely apposed to its 

 fellow, and above them a pair of small closely joined inferomarginal plates (Fig. H, i) ; 



