ECHINOIDEA. II. 



93 



species from A. fulva, that no spatelformige spines occur inside the fasciole (evidently judging from 

 Agassiz' statement in his description of the large form that within the peripetalous fasciole the 

 spines are longer, not clubshaped); this does not hold good, at least in the specimens before me. 

 De Meijere further finds a difference in the structure of the spines of the two species, viz. that in 

 A. fulva the widened point of the spines is serrate along the edge, whereas it is smooth in A. rostrata 

 founding on the figure (PI. XLL 7 evidently) given by Agassiz. This character will not hold good 

 either; the widened part of the spine is (more or less) serrate at the edge also in A. rostrata. - The 

 small spines and clavnlse have an ampulla I at the point, as found by de Meijere in A. fulva 

 (PI. XV. Fig. 43). -- The sphseridise are slender, generally rather elongate; in the anterior ambulacra 

 they continue up to the fasciole, in the posterior to the anal area. 



Pedicellarite. Only rostrate and tridentate pedicellarise have been found. The rostrate pedi- 

 cellarise (PI. XV. Figs, i, 13) have almost straight, flat valves, with the point rounded, not widened, 

 faintly serrate; neck very short; the stalk may have a faint milled ring below. The head is ca. o - 5 mra 

 in length; the strong brownish adductor muscles between the valves make these pedicellari;e rather 

 conspicuous. They may occur very numerously over the whole test, or very sparingly. The tridentate 

 pedicellarite (head up to i mm in length) have simple, leafshaped valves, which join in almost their whole 

 length. In large specimens the edges are bent somewhat inwardly in the lower part of the blade and 

 very irregularly serrate. The blade may be open down to the apophysis, or the edges may unite to 

 form a coverplate over the lower part; generally there is no mesh work in the blade, but in a speci- 

 men examined in the Museum of Yale College I found the larger tridentate pedicellarise with a rather 

 richly developed meshwork (PI. XV. Fig. 2). The basal part is rather narrow ; the edges may be some- 

 what serrate. The neck is short, the stalk without a milled ring below. They occur in all sizes from 

 quite small to ca. i mm length of head. (PI. XV. Figs. 8, 21, 29, 52.) Quite small forms (PI. XV. Fig. 37) 

 may perhaps better be termed triphyllous. According to a sketch of a living specimen made on board 

 the Ingolf the colour is light yellow, the fasciole alone being of a prominent brown colour. In some 

 specimens seen in the Museum of Yale College the frontal tube-feet were violet. - 



This species was taken by the Ingolf* at the following stations: 



St. 36 (61 50' Lat. N. 56 21' Long. W. 1435 fathoms. i5 C. Bottom temp.) 3 specimens. 

 - 37 (60 i/ 54 05' 1715 i4 ) 5 



The geographical distribution, as far as hitherto known, is the Northern Atlantic, at the Ame- 

 rican side, and the Davis Strait; the bathymetrical distribution is 12401750 fathoms. In the Chal- 

 lenger-Report the species is stated to occur also in the Bay of Biscay and at the Coast of Portugal, 

 as also in the Arafura Sea (Chall. St. 191. 800 fathoms). That the specimen from the latter locality is 

 wrongly referred to A. rostrata I have shown above. Regarding the locality Bay of Biscay and Coast 

 of Portugal 2 it may be remarked that in ^Summary of Results of the Challenger-Expedition I. 

 p. 114 A. rostrata is named from St. 2, off the Mouth of the Tagus, 470 fathoms; but since the 

 specimens were without distinctive Station number, it seems not to be relied upon that the 



1 I name it thus, as it is evidently a structure of the same kind as the amp'ulla in the secondary spines of some 

 Cidarids, described by Hainan n and Prouho. 



2 Duncan (Revision, p. 270) from this expression concludes that one specimen was taken in the Bay of Biscay, 

 later on another off the coast of Portugal, which there is nothing else to support. 



