the ' Challenger ' Eryonidea, 



221 



accurate. From the anangement of tlie median dorsal spines 

 of the carapace, it appears witii little doubt that Eryonicus 

 faxoni, Bouvier (Bull. Mus. Oc. Monaco, 1905), is a synonym, 

 and that therefore E. ccecus is a young stage of Stereomastis 

 (Polycheles) sculpta, Smith. If a single spine is designated 

 with 1, a double with 2, and a blunt-tipped with '6, the 

 arrangement alluded to may be represented thus : — 2 (the 

 very small rostral spines) — 1 — 2 — 3 (cerv. sulcus) — 2 — 2 — 

 3 — 2. I could not detect the single spine occupying the 

 fourth place in E. faxoni, but that may be due to the bad 

 state of preservation making the investigation very difficult. 

 Along the lateral edge is found a row of eight long spines, on 

 the branchial area a row of five, on the gastral area two, and 

 on the branching point of the cervical sulcus one. 



• Willemoesia leptodactyla, Willemoes-Suhm. 

 Bate enumerates (p. 164) four specimens from the 'Chal- 

 lenger' referred to this species, but on p. 169 he mentions 

 five. The C(dlection contains six, some particulars of which 

 are given in the table below, as Bate's statements partly are 

 inaccurate, partly wrong. Measurements given in per cent. 

 of carapace length, if not expressly stated as mm. 



