362 HYALONEMA (PHIALONEMA) PATERIFERUM. 



that they are Hyalonemas, and if so they must be placed in the subgenus 

 Phialonema. 



Of the known species of Hyalonema H. globus F. E. Schulze ' appears to 

 be most nearly allied to the sponges above described. With this species they 

 agree fairly well in respect to the pinules, the shape of the shaft, and the short- 

 ness and breadth of the anchor-teeth of the large macramphidiscs. They differ, 

 however, from H. globus by having secondary spinelets on some of the primary 

 spines of the distal rays of their pinules, by their small micramphidiscs being 

 much larger and by the anchors of their large macramphidiscs having an alto- 

 gether different shape. 



Hyalonema (Phialonema) pateriferum Wilson. 

 Plate 50, figs. 6-15; Plate 51, figs. 1-28; Plate 52, figs. 1-29. 

 Mem. M. C. Z., 1904, 30, p. 28, Plate 1, figs. 1-13. 



Six specimens of this species were collected during the expeditions of 1899- 

 1900 and 1904-1905 in the Central and Eastern parts of the Tropical Pacific. 

 Two of these, found at Station 3684 (A.A. 17), together with two other specimens 

 and three fragments of the same species previously collected in the Gulf of 

 Panama at Stations 3363 and 3376, were described by Wilson as Hyalonema 

 pateriferum. Among the sponges of the expeditions of 1899-1900 and 1904- 

 1905 placed at my disposal for description, there are four specimens, all from 

 different stations, which belong to this species. Two of these were trawled off 

 the coast of northern Peru at Stations 4651 and 4656, and two in the Eastern 

 Tropical Pacific at Stations 4721 and 4742. 



For the reasons given below I distinguish six forms within this species : — 

 the two specimens and three fragments described by Wilson from Stations 

 3363 and 3376 A 



the two specimens described by Wilson from Station 3684 (A.A. 17) B 



the specimen examined by me from Station 4651 C 



the specimen examined by me from Station 4656 D 



the specimen examined by me from Station 4721 E 



and the specimen examined by me from Station 4742 F 



Shape and size. One of the specimens of form A is, according to Wilson 

 {loc. cit.), obconical, irregular, 65 mm. high, 90 mm. broad, and provided with a 



' F. E. Schulze. Rept. Voy. Challenger, 1887, 21, p. 221, pi. 40, figs. 1-16. 



