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 RosselUnae differ from Lanugonychia 

 flahellum by the absence of pluinicomes, 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 flahellum 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 flahellum. 



Acanthascinae F. E. Schulze. 



Rossellidae with discoctasters. 



The collection contains one specimen of this subfamily, a new species of 

 Staurocalyptus. 



STAUROCALYPTUS Ijima. 



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-hke rays (end-rays). To this the name refers. 



Shape and size. The specimen has the shape of a shallow, inverted cup. 



• F. E. Schulze. Revision des systemes der Asconematiden und Rosselliden. Sitzungsb. Akad. 

 Berlin, 1897, p. 548. 



