140 



E. Jørgens 



giA'cn by Baiiæy. After this drawing it has only cephalis and 

 thorax. 



Frequent, though never numei'ous. 



Distrihaimi : On the west coast of Norway, very rare. In 

 surface samples 7.; 1901, off Søndmøre, and "A oft' Lofoten (cfr. 

 <above under Cladoncenium trirolpium, p. 134). 



If this species be Cleve's Theocalyptra cornuta, it has been 

 found at great depths at some places in the North Atlantic right 

 up to the north west coast of Spitzbergen, and at scattered places 

 in the western part of the North Atlantic. Most probably boreal 

 oceanic. 



I>iftj oot'ras Hck. 



D. acanthicum Joro. 

 (PI. XVII, fi<r. 101 a : pi. XVIII, fig. 101 b). 



JORGENSEN L. 91. p. 84. 



It appears very doubtful whether tliis species really is spe- 

 cifically different from the following one. 



The only difference appears to be in the protruding basal 

 spines, which in this species are little more strongly developed 

 outside than inside the lattice shell, while they are transformed 

 into three-edged swords in D. xiphephornm. I retain, however, 

 I), acanthieitm preliminarily as a separate species, as it is, gener- 

 ally speaking, easy to keep it distinct from B. xiphei)liorum. If 

 they should pi'ove to belong to the same species, D. amnthicmn 

 would be the younger stage. 



Rather i-are, always in deep water- samples, sparse. 



Dlvtrihution : On the west coast of Norway rare. In surface 

 samples ^V^ 1901. off Lofoten, and '',4 oft' Finmarken (8/S Michael 

 Sars, cfr. above). 



D. xiphcplioruui Jurr. 



JOKGENSEN L. 91. p. 84. pi. V. f. 25. 



Distrihntiori: Like the preceding one. 7- 1901. off" Sønd- 

 møre, in the surface (>S/S Micliael Sars, cfr. above). 



Stiehocorj'S seriata (Johg.) 

 (PI. XVIII, figs. 102—104). 



Euci/rfiduoii f<('iiritt(vi .Tiuui. in Gran L. 70. p. 150 (nomen 

 nu(him). 



A many-jointed form. I'he uppermost joints are convex and 

 increase in size so that tlie diameter of the fifth is from three to 

 four times as great as that of the first. The lower part is more 

 or less distinctly cylindrical. On the cephalis, there is a short 

 broad tophorn. The pores below are roundish rectangular, in very 

 distinct, regular, horizontal rows. 



The number of the joints varies, pi-obably according to age. 

 Uppermost there is a low, semispherical (oi- broader) cephalis, then 

 short joints, which increase evenly in width up to the fourth or 

 fifth, which is usually the broadest. From the sixth joint, which 

 is decidedly narrower, the width decreases, but very slowly, so 

 that the lower part is almost cylindrical, only a little narrower 

 below. I have not seen more than eight joints. These lower 

 joints in the cylindrical part are not plainly divided off from each other. 



The upper part of the shell is shaped like a high cone. 



There is a short, broad, three-edged (?) toijliorn protiuding 

 from an inner skeleton in the two upper joints. 



It is not easy to see these inner skeleton parts which are, at 

 all events, in a high degree retrograded, for it is a difficult mattei- 

 to examine the shell from the open end, and the outer lattice shell 

 in side view hides the short, primary spines. So I have not been 

 able definitely to decide whether this genus has the same primary 

 skeleton parts as the foregoing ones. Neither have I been sure if 

 protruding basal spines exist in the two upper joints (the apical 

 spine only excepted). 



The shape of the cephalis in some positions of the lattice shell 

 might suggest that also inner primary arches are to be found, and 

 not only the primaiy spines. 



It is doubtful whether there is a protruding ventral, sagittal 

 spine. 



On the other hand, a long, inner axial spine is plainly visible. 

 It seems to consist of three or more long, parallel branches, which 

 reacii down through more than half the length of the lattice shell. 



The central capsule also reaches far down through the shell. 



The pores on the cephalis are small, round, -widely apart and 

 scattei'ed. On the second joint, they are perhaps a little larger, 

 on the third somewhat smaller again, and from here they are re- 

 gularly placed in horizontal rows. From the fourth joint and down- 

 Avards, the pores become more irregular in form and size, from 

 quite small and round to rather large, roundish rectangular in shape, 

 although generally speaking they are small and always in regular, 

 hoi'izontal rows. On the cylindrical lower part, they are also placed 

 in more irregular vertical rows. The average size of the pores 

 does not increase, at any rate noticeably, from the fourth joint 

 d wnwards. 



This species varies ratiier considerably. For instance, its grea- 

 test width may be either in tlie foui'th or fifth joint, and there are 

 often irregular contractions in the lower part. It is doubtful 

 whether any of the individuals illustrated are fully developed. On 

 the best developed specimen (fig. 102) the lower margin was re- 

 gularly dentate. Often young individuals may be found consisting 

 of only a few joints and entirely without the cylindrical lower part. 



Height, up to 128 [j., greatest width 72 \l. Pores, up to 6 ix. 



The species resembles the one illustrated by Cleve, L. 30, 

 pi. 2, figs. 5 and 6, which he calls Lithomitra australis Ehkb. 

 It is probable that the same basal spines are present in this spe- 

 cies, protruding as fine needles, as in Androcyclas gamxilionycha 

 and Clathrocyclas craspedota. Even if these spines are present, 

 Haeckel's name for the genus might in this case be retained with- 

 out any great disadvantage. 



Rather I'are. always in small numbers and only in deep water 

 samples. 



DiftriliKt'tou : In surface samples, -/-: 1901. ofi' Sondmore, '•'■_• 

 off Lofoten and Vs off Finmark (cfr. above). 



Most probably a boreal oceanic species. 



VII l>. Phaeodaria Hck. (Tripylea). 



VII I>. 1. Caniiosphaerida Hck. 



<^aiiiio»<|>liaera Hck. 

 C. gvonietrica Boro. 



lioRGEKT L. 12, pi. 0. f. li; L. 14. p. 25. f. 25. 



This species is smallei', but moi'e lobust than the following. 



