58 ECHINOIDEA. 11. 



of two specimens from St. i68. A specimen from St. 244 is certainly not P. lagiDicula ; whether it is 

 the narrow form cannot be decided witli certaint>-, since it is ver\- crushed, but it does not seem to 

 be tliat form — in that case the figures PI. XXXI. 7—9 would indeed be very bad. Probably it is a 

 third species, related to P. p/iiali-. The spines are widened at the point as in the latter species. Also 

 the true P. lagniicula is represented as having the spines distiuctly widened at the point (PI. XXXI. 

 Fig.s. I — 51; in the description thev are said (p. 137) to be tapering very shghtly or clubshapeds. They 

 are, in faet, not at all widened or clubshaped, but several of the spines are invested towards the point 

 w'ith a dark brown matter, the nature of which I could not decide. But in any case it is a toreign 

 matter, not part of the spine itself. The figures cited therefore give a wrong impression of this species 

 as regards the' form of the spines. 



Perhaps one more species, allied to P. Jeffreysi and Waiidcli. will be found to occur in the 

 northern Atlantic (warm area). Among the specimens of Pourtahxia Waiidrli from the Ingolf St. 40 

 and further from St. 67 and 68 there are some small specimens (18—25""") oi Si Poiirtalesia. which differ 

 from P. W'aiidcli in having shorter and smooth (or \ery little serrate) spines and the abactinal keel 

 more developed and produced over the periproct; the anal snout bends a little upwards. In faet 

 these specimens are rather like P. Jcffrrysi ; from this species they differ, however, in having only 

 three epiproctal piates (5. a. 6^ — 8 and b. 7 — 9), whereas in Jeffreysi of a corresponding size there are 

 four epiproctal piates on each side (a. 5 — 8, b. 6 — 9); also the anal .snout is flatter \\\ Jeffreysi. The 

 general shape of tlie test is as in /-". Wajtdeli, though a little narrower at the anterior end and compa- 

 rativelv a little wider in the middle. The serial arrangement of the tubercles not distinct in the pos- 

 terior series of piates of the antero-lateral ambulacra. Upon the whole this form is quite intermediate 

 between P. Wandeli and Jeffreysi, uniting several of the prominent characters of these two species. It 

 further agrees rather closeh' with tlie form figured as P. ])iiranda in Panamic Deep-Sea Ech. , 

 excepting the labrum, which is not seen from without in these specimens. — Whether this be a 

 distinct species or only a variety of P. IVai/deli (or perhaps a warm area variety of P.Jeff'rtysi) I do 

 not ventiu-e to decide from tlie present scanty and not too well preser\-ed material; I must be content 

 with calling attention to this form and leave it to those wlio will be so fortiTuate to get sufficient 

 material to decide the question. 



23. Echinosigra ' (Pourtalesia) phiale - Wyv. Thomson. 



PI. VI. Figs. 1-2, 7. PI. VII, Figs. I, 7. 



Wyville Thomson: Depths of the Sea. p. 90. (394). Ann. Nat. Hist. 4 Ser. X. p. 305. Porcu- 

 pine -Echinoidea. p. 749. PL LXX. Fig. 11. — A. Agassiz: «Challenger -Echinoidea. p. 138. PI. XXII' 

 1—5. XXII.a. I— 2. — D'Arcy Thompson: (392). Proc. R. vSoc. Edinburgh. XXII. 1899. P- 43i- — ^'^• 

 W. Kemp: The Marine Fauna of the West Coast of Ireland. III. Ecliinoderms. Ann. Rep. Fish. Ireland. 

 1902—03. PI. II. App. VI. (1905). p. 206. 



■ With regard to this iiame, .see below p. 82. 



- In the Report on the Echinoidea of the Porcupine* Wyv. Thouison writes ■iphyalea. Both on account of prior- 

 ity and etyniologj- -fi/iia/e- \s. the correct nanie. 



