PORIFERA. II. 1 yn 



being comparative!}- larger than that of the larger chelae. The chela; may also vary somewhat in 

 form in different individuals, thus sometimes the alse of the larger end may continue far down towards 

 the other end, and may even be united with the ala; of this end, which feature, however, must be 

 regarded as a monstrosity; in such cases also the tooth passes far down towards the tooth of the 

 lower end. The length of the chelae is between croi6 and o-036 m '", and the breadth is 0-0057— o-on mm . 

 2. The bipocilla are of the common form described in the preliminary remarks of the genus; the 

 slight indentation of the edge of the lower end is rather distinct under high magnifying powers. The 

 shaft is somewhat expanded through its whole length, and above it forms a narrow ala on either 

 side. The bipocilla are somewhat varying in size, as well in one individual as in different individuals; 

 in the larger ones the indentation of the edge of the lower end is distinctly discernible; the inden- 

 tation often continues rather far up. Sometimes, especially in some individuals, monstrous forms of 

 the bipocilla occur, the most common monstrosity being that the tooth of the upper end is split, often 

 quite irregularly, and also the alse may be separated from the shaft and assume peculiar forms. The 

 length of the bipocilla varies from o - oo8 — o - oi4 mm , but sometimes it does not exceed 001 i mm . The 

 microscleres are found both in the tissue and in the dermal membrane, perhaps in larger numbers at 

 the latter place. Sometimes the chelae seeiii to be present in larger numbers than the bipocilla, some- 

 times the reverse is the case. 



Embryos. In some individuals embryos were found lying in the tissue in large numbers. They 

 are globular, and their diameter is ca. o - 30 mm . Of spicules the examined specimens showed only chelae, 

 which are thus the first occurring spicules. In the spicula-preparations, however, just from specimens 

 with embryos, some needles are found gathered in a bundle-like manner, which have surely belonged 

 to the embryos. These spicules are straight or slightly curved; they are highly thickened at the head- 

 end, thus approaching subtylostyli, and they are comparatively strongly spined; they were measured to 

 a length of 0-12 — o-i4 mm . 



This species is characteristic and well bounded, when both the outer form, the spicules, and 

 the structure of the dermal skeleton is considered. — I regard the determination as sure. Vosmaer's 

 specimen evidently is not regularly cup-shaped, what is seen partly from the figure, partly from the 

 expression «a cup-shaped great mass . It is also to be noticed that his figures 79 and 80 evidently represent 

 spicules not belonging to the sponge; fig. 80 looks as a yl/jyrrt/r-anisochela. — The species mentioned 

 by Levinsen (Dijmphna-Togtets zool.-bot. Udbytte, 360, 16) as Esperella picea, according to my 

 examinations, is not this species, but a new one, see under I. frigidits p. 183. The species mentioned 

 by Fristedt I.e. as Espcria nigricans, to judge from a fragment examined by me, is identical with the 

 present species, as is also shown by his remark that the sponge may be leaf-shaped; when he says 

 that it is generally an amorphous mass, it is, I suppose, on account of his having had only fragments 

 before him. 



Locality: This species has been obtained in a great many specimens, mostly, however, only 

 fragments. Station 1, 62 c 30' Lat. N., 8 C 21' Long. W., depth 132 fathoms; station 3, 63° 35' Lat. N., io : 24' 

 Long. W., depth 272 fathoms; station 4, 64 07' Lat. N., n c 12' Long. W., depth 237 fathoms; station 7, 

 63 13' Lat. N., 15° 41' Long. W., depth 600 fathoms; station 27, 64° 54' Lat. N. , 55" 10' Long. W., depth 

 393 fathoms; station 32, 66 c 35' Lat. N., 56 38' Long. W., depth 318 fathoms; station 43, 6i° 42' Lat. N., 



