45 
2°, A sp. (fig. 89). Great bows with sharply pointed, spined extre- 
meties. They ressemble the bows of Suberites arciger O. S. and 
Clathria lobata Vosm. 
3°. rut. rut. (fig. 94). 
4°. anc. anc. (fig. 92) frequent, but very minute, often nearly 
anc?”. Again in this species I found gigantic anchorates (fig. 93), 
which are however few in number. 
5°. c2 (fig. 95) The bihamates = S-shaped spicules are of the 
ordinary form. 
25. Esperia constrieta (Bwk.) Vosm. [Pl. III, figg. 99—104; 
pl- IV; fie. 153]. 
Diagn. Corpus irregulare; superficies corrugata. Spieula indicantia : 
triöner Euler) ac, (1) NB. |rut./rut. | © |/ae2. | 
Local. Lat. 72° 32'3 N.; long. 36° 39,5 E. (July 15, 1879). 
Geogr. distrib. Shetland (Bowerbank). 
Depth. 123 Fathoms. 
Synon. and literature. 
1866. Desmacidon constriectus Bwk. | 
(Bowerbank, Monogr. Brit. Spong. II, pag. 350.] 
Compare also: 
1874. Bowerbank, Monogr. Brit. Spong. III, pag. 181, Pl. LXXI 
figg. 3—10. 
1880. Vosmaer, Notes from the Leyden Mus. II, pag. 145. 
Special description. 
Bowerbank’s Desmacidon constrietus is without doubt an Esperia. 
But as this author has only had a dried fragment and does not 
illustrate the external appearance of the Sponge, I could not 
compare this with the Sponge under description. I must call atten- 
tion to the fact that it is probable than if he had seen more spicu- 
les he would have observed that in this Sponge their shape also 
varies. For that reason I do not hesitate to identify my Sponge 
with Bowerbank’s Desmacidon constrictus, which, as the anchors 
are inequiended must be brought under Esperia. 
The Sponge forms a great irregular massive body, which has not 
