112 STAUROCALYPTUS HAMATUS. 
has indeed observed small and delicate oxyhexaster-like spicules in rare instances 
in Lanuginella pupa. Since, however, he considers these spicules as young stages 
of the discohexasters, this observation does not invalidate the correctness of 
F. E. Schulze’s statement ' that the absence of onychhexasters (to which kind of 
spicules F. E. Schulze considers the onychhexasters to belong) is characteristic 
of Lanuginella. There being therefore no reason for altering this characteristic 
of Lanuginella I accept it and am consequently unable to place the sponge above 
described in Lanuginella. 
Since the otherwise similar species of Rossellinae differ from Lanugonychia 
flabellum by the absence of plumicomes, and since F. E. Schulze and I. Ijima 
consider the absence or presence of plumicomes in the Rossellidae as a difference 
sufficient for generic distinction, I do not think it advisable to place Lanugony- 
chia flabellum in any of the described genera. As it seems to be most closely 
allied to Lanuginella and as it differs from this genus chiefly in that it possesses 
onychhexasters, I propose Lanugonychia, the type and, at present, only species 
of which is the Lanugonychia flabellum. 
Acanthascinae F. E. Scuutze. 
Rossellidae with discoctasters. 
The collection contains one specimen of this subfamily, a new species of 
Staurocalyptus. 
STAUROCALYPTUS Iyma. 
Rossellidae (Acanthascinae) with oxyhexasters, small discohexasters, and 
discoctasters, and with hypodermal pentactines the lateral rays of which are des- 
titute of long curved spines. 
Staurocalyptus hamatus, sp. nov. 
Plate 16, figs. 25-43; Plate 17, figs. 1-25; Plate 18, figs. 1-14. 
One specimen of this species was trawled at Station 4642 on 7 November, 
1904; 1° 30.5’ S., 89° 35’ W.; depth 549 m. (300 f.); the bottom was composed 
of broken Globigerina and molluscan shells; the bottom-temperature was 
48.6°. It is characterised by the possession of numerous oxyhexactines and a 
few hemioxyhexasters with hook-like rays (end-rays). To this the name refers. 
Shape and size. The specimen has the shape of a shallow, inverted cup. 
1 F. E. Schulze. Revision des systemes der Asconematiden und Rosselliden. Sitzungsb. Akad. 
Berlin, 1897, p. 548. 
