i8o 



ECHINOIDEA. I. 



to var. norvegicus^ and they represent both of tliem transitional form.s between the species with 

 primary tubercle on every arabnlacral plate and those with primar>- tubercle only on every other 

 ainbulacral plate. — The specimens of norvcgicus mentioned here, have a specially small peristome, 

 accordingly they belong to the form »licrostoma. 



Echinus csctdentus (p. i6i). The specimens of this species from the Mediterranean foimd in 

 Amsterdam and in British Mnsenm,- are correctly determined, but have been got from older collections, 

 or bought from dealers in natnral objects; consequently the localit}- is unreliable, and, as we have no 

 other statements of the occurrence of this species in the Mediterranean, evidently wrong. This holds 

 also good with regard to the specimens stated to be from Port Natal. The specimen after which the 

 species is noted from the coasts of Spain and Portugal by Bell and Hoyle, is Par echinus miliaris. 

 The specimen of Fxh. csculentus (Talisman . CajDe Spartel, 717 m.) mentioned by Bernard, is Ecli. 

 elegans. — Tlie determinations by Bernard of the Echinus species, are otherwise quite confused: 

 imelo>^ is acutus^ aiorvegicus./ '\s Alexandria iacutus;^ is a typical var. norvegicus. — The specimen from 

 Brazil (John Adam's Bank) is stated to have been obtained by the Herald -Expedition; it is correctly 

 determined, with a label within it; accordingly there can ajJi^arently be no doubt of the correctness. 

 As we have not, however, other statements of the occurrence of the species off Brazil, I must for the 

 present remain sceptical with regard to this statement. The other distribution of the species does not 

 indicate that it should really be found off Brazil. 



Through Prof. Bell I have received a new Echimis-s^eci&s (from Department in the course of 

 fishing investigations), taken west of Ireland ( Porcupine -bank, 91 fathoms), 2 specimens. 



All the measures are in millimetres. 



The test is almost globular, especially in the large specimen; the edge of the mouth not 

 curved invard. There are spines on the buccal piates; numerous, rather thick piates in the buccal 

 membrane. No ocular piates reach to the periproct. Onh- every other ambulacral plate has a primary 

 tubercle; on the other piates there is a rather large secondary tubercle in the inner end and one a 

 little outside of the primary series, near the pores; otherwise there are almost no tubercles in the 

 ambulacral area. The pores reach quite to the edge of the area. Each interambulacral plate has a 

 primary tubercle and moreover ca. 4 — 6 secondary ones, which are, however, far from filling the plate, 

 so that the test looks rather naked. The primary series are distinct. Miliary tubercles numerous. 

 On the actinal side the tubercles are placed much more closely. Here the spines are rather long, 

 directed straight downward, not flat or widened at the point; the abactinal spines .short and fine. Pedi- 

 cellariæ and spicules quite as in Ech. csculentus. The colour of the preser\'ed specimens wliite. — After 

 a communication from the Rev. Canon A. M. Norman it is this species he has described as Ecli. 



