56 ECHINOIDEA. II. 



also montioned in tlie description (p. 345). As P. Wandrli is not mature at a smaller size than ca. 20""" 

 length, tilis difference between these two species seems so essential tliat the\- could for that reason 

 alone not be regarded as so ver\- closely related. I mnst, however, be allowed to suggest, that 

 this statement of the size of Ihe t>pe specimen of P. niiraiida is a mistake. In the description in Rev. 

 of Echini as well as in the preliminary description (BuU. Mus. Comp. Zool. I. 1869. p. 272) nothing is 

 said about the size of the specimen, but in the explanation of the PI. XVIII the figure i is said to 

 represent the specimen magnified 3-5 in diameter . The figure being 70""" in length, this would 

 pive a size of 20™'" for the type specimen. (In Three Cruises of the <Blake> II. p. loi the figures 

 from the v Revision arc copied in half size, and the figures are theu said to represent the .specimen 

 twice magnified; this would give a size of 18'"'" for the type specinien|. I think there eau be little 

 doul)t of the correctness of m\- suggestion as to the size of the type of P. iniranda (which has, 

 unfortunatelv, been lost), and thus this difference between P. miranda and Wandcli is reduced to 

 nothing. (It would alsi) be quite surprising that a specimen of so small a size as 3-5'""' should be 

 mature). The structure of the test of P. miranda is not worked out in the Revision of Echini , but 

 in Panamic Deep-Sea Echini p. 140 careful figures are given thereof, from a specimen of 18""" length, 

 collected bv the <Blake^ This specimen, it must be conceded, agrees ver\- closeh- with P. Wandcli, 

 the onlv differences worth mentioning being that the anal snout bends a little upwards and that the 

 labruni is large, which I have never found to be the case in P. Wandeli. Remembering, however, the 

 inconstanc\- of this feature in P. Jeffreysi, it is not safe to la\- much stress on this single feature. I 

 thus think it \erv likel\-, indeed, that the specimen figured in the Panamic Deep-Sea Echini» under 

 the uame of 1'. miranda is identical with P. Wandcli; but on the other band I cannot think that it 

 is really P. iniranda. A comparisou with the original figures in Revision of Echini PI. XVIII .shows 

 several important differences. The outline in side view is very different; in the figure in Rev. of 

 Ech. the front slopes forwards from the apical system, in the specimen figured in Pan. Deep-Sea 

 Ech. it slopes inwards; but the anal region especially is very different, the projection over the peri- 

 proct being much larger and the anal snout turning much more upwards than in the specimen from 

 the Blake ; the snout is also much broader in the t\pe specimen. The differences pointed out 

 here hold good also when comparing with P. Wandcli; further I ma\- notice a very conspicuous dif- 

 ference in the spines. According to the description the primar\- spines are long, cm-\-ed, slighth- fau- 

 shaped at the extremity, as also appears in the figures; no serial arrangement of the .spines is indi- 

 cated on the figui'es or mentioned in the text. It seems hardly possible that the serial arrangement, 

 so evident in P. Wandcli and the specimen from the « Blake;, could have escaped completely the 

 notice of the author of Revision of Echini \ the figures looking, indeed, much too good and carefully 

 drawn for suggesting such an omission. Also the length of the spines is ver\- different from what is 

 the case in P. Wandcli. — Further the large tentacles in the odd ambulacrum and the coloration are 

 conspicuous differences from /'. Wandeli. In m\- opinion it eau scarceh- be doubted that the specimen 

 described and figured in .Panamic Deep-Sea Echini as F. miranda xa not that species but /^. Wandeh, 

 (or a nearly related, undescril)ed species — comp. below), whereas /-". miranda. which has still to be 

 rediscovered, Ijelongs to a (juite different type of Pourtalesiæ, characterized (as far as hitherto known) 

 by the broad anal snout, the large front tentacles and the comparatively short, not serially arranged 



