34 
Depth. Unknown. 
Literature. 
1870. Schmidt, Grundz. Spong. Atl. Geb. p. 37. 
1870. Mikl. Maclay, M&m. de l’Acad. d. Sc. de St. Petersbourg 
VII 8er: Tom. XY, N°. 3, pag. 5, Tab. Ehe 
1878. Dybowski, Zool. Anz. pag. 32. 
1880. Id., M&m. de l’Acad. d. Sc. de St. Petersbourg. VII Ser. 
Tom. XXVII, N°. 6, pagg. 37, 44 and 45. Tab. III, fig, 3. 
Special deseription. 
In Fig. 14 on Plate I I have represented one side of the Sponge, 
with the oscula. It is very remarkable that the Sponge has another 
colour in the lower part (the pedicel) as in the upper part. But again 
there are neither oscula nor pores in the pedicel, and it has stronger 
fibres, being consequently much more compact. 
I hope to show that our Sponge is nearly allied to Pachychalina 
compressa ©. 8. I will therefore call to mind what is known about 
that species. Unfortunately nearly all descriptions of Pachychalina 
compressa are very incomplete. The first of Oscar Schmidt!) can 
hardly be entitled a description. Schmidt’s name may hardly figure 
after that of Pach. compressa, for Dybowski is in fact the first 
who has given a short description and figured the spicules and fibres. 
There can be no doubt that our Sponge belongs to Schmidt’s genus 
Pachychalina of 1868) and 1870 °). The description of P. exelsa 
O0. S. is too short for determining a species. 
In the year 1878 Dybowski published that he had found out 
that the Veluspa polymorpha var. arctica of Miklucho-Maclay was 
a Pachychalina. He only says‘): „Es hat sich ferner herausgestellt, 
dass drei Veluspen-Varietäten Miklucho’s zu verschiedenen Gattun- 
gen gestellt werden müssen und zwar:.... var. arctica —= Pachy- 
chalina aretica....” This was only a preliminary account; in 
1880 he published his „Studien über die Spongien des Russischen 
l. c. pag. 37. 
1) 
2) Schmidt, Spong, Küste v. Alg. pag. 8. 
3) 1. c. pag. 37. 4) 1. c. pag. 32. 
