ECHINOIDEA. I. i6l 



Parcchiniis^ althoiigh it is not equally marked in all of them. On the biiccal piates and on a few of 

 the other piates in the bnccal membrane some small, chib-shaped spines of a length of a coiiple of mm. 

 are fonnd (PI. XX. Fig. 24). As tliese spines are found in no other genuine Ær/z/w^w-species '), they are 

 an excellent distinguishing character of this species; they are, however, not fonnd in quite small indi- 

 viduals, until these have reached a diameter of ca. 15""". 



The buccal membrane contains nunierous, more or less complicate fenestrated piates (PI. X\'I. 

 Fig. 12); in larger specimens some of these are so large and thick, that they are seen as small knobs 

 on the dried buccal membrane. Inside of the buccal piates they are more numerous and smaller, and 

 are arranged in radiate series. A few bihamate spicules are rarely seen in the buccal membrane. 

 In the gills they are found in larger nunibers together with the common irregular fenestrated piates. 



The pedicellariæ. The globiferous pedicellariæ (PI. XIX. Fig. 24) with i — i, sometimes i — 2 

 lateral teeth, otherwise without marked peculiarities. The tridentate pedicellariæ (PL XVIII. Figs. 13, 20) 

 have a long, narrow, rather deep blade; from the upper end of the apophysis some mesh-work reaches 

 a longer or shorter way into the blade; in small pedicellariæ no such mesh-work is found (Fig. 13). 

 Only at the point, where the valves join, the edge is somewhat serrate; in the other part it is straight, 

 but set with small teeth placed in transverse series as in the other j5"(r///«//j-species. The ophicephalous 

 and triphyllous pedicellariæ of the common form; sometimes, however, may be found a few large, 

 elongate ophicephalous pedicellariæ, quite as those described above in Ec/i. Alexaiidri. The sphæridiæ 

 (PI. XIX. Figs. 28, 30) with few grooves, sometimes a little thorny. Spicules (PL XVIII. Fig. 12) of the 

 common' form. 



B)- the <■ Ingolf -Expedition this species has been taken on the following stations: 



St. 6 (63' 43' N. L. 14° 34' W. L. 90 fms. Bottom temp. 7° 5). 2 specimens. 



- 54 (63° 08' - 15° 40' _ 691 ~ - 4° 2). 2 



- 86 (65^^ 04' - 23° 48' - 76 - - ? ). I - 



- 89 (64'' 45' — 27^20' —310— — 8° o). I — 



Otherwise it is found along the European coasts from Britany to Spitzbergen and Iceland. 

 Hoyle (op. cit.) mentions it also from the coasts of Spaiu and Portugal and from the Mediterranean, 

 and Bell (Catalogue) f urther notes it from Port Natal and Brazil. The two last statements I must suppose 

 to be incorrect, whether they are owing to wrong determinations or wrong labelling. A so wide 

 distribution of a littoral species would be something quite exceptional, and if this large, conspicuous 

 species were really found on the coasts of South Africa and Brazil, we should certainly have sufficient 

 statements of this faet. I must also regard its occurrence in the Mediterranean as doubtful, probably 

 owing to a coufounding with other species {acitfits}). When Hoyle cites Carus as an authority for 

 its being found in the Mediterranean, it must be owing to a misapprehension. Carus, in his Pro- 

 dromus Faunæ mediterraneæ^>, does not mention this species, but only Ech. esciilciifiis Lanik. (not L.) 

 as a synonvm of Spli<rrrcli. graiinlaris. Sluiter (371) also mentions a specimen of Ech. esculoitns L. 

 from the Mediterranean, but I cannot regard this museum-statement as quite reliable either. 



I) Iii the description of Ech. lucidus by Doderlein (114) it is said: >.Da.s Buccalfeld ist glatt bis auf 10 iiia,ssig grosse 

 Plattchen, dereu jedes einen grosseren Tuberkel und einige Pedicellarien tragt . This luight indicate that also in this species 

 spines mav be found on the buccal piates. On the specimen I have examined, I have not. however, seen any such sjnnes. 



The Ingolf-Iixpedition. IV. 1. 21 



