394 THE VOYAGE OF H.M.S. CHALLENGER. 



uncinates and small oxyhexacts, numerous oxyhexasters ivith strongly developed long 

 principal rays, each with four short, markedly diverging terminals. The dermal and 

 gastral scopute exhibit straight, or slightly curved, but never dislocated prongs with 

 barbed terminal knobs. Japan, 80 to 200 fathoms. Sagami Bay, Japan, 100 to 200 

 fathoms. 



Genus 2. Periphragella, Marshall. 



With the single known species Periphragella elis^, Marshall. 



A cup- or funnel-shaped form, about a hand's length in height, with a lateral wall 

 formed of an irregularly anastomosing system of tubes. A somewhat solid basal portion 

 about as thick as a finger forms an attaching expansion, and passes gradually into 

 the parietal tubes, which measure at first 3 to 4 mm. in width, but become gradually 

 wider upwards. These tubes arise from the folding of the primary plate-like funnel-wall, 

 and are thus on the one hand in open communication with the large internal gastral 

 cavity, and on the other iDy the round terminal aperture with the exterior. The beams 

 of the tolerably regular, square or rectangularly meshed dictyonal framework are smooth 

 or slightly spinose, and exhibit no markedly thickened nodes of intersection. The 

 parenchyma contains, besides the usually, but not exclusively radially disposed uncinates 

 and small oxyhexacts, oxyhexasters with rather short principal rays, each with two to 

 four moderately long, externally curved terminals, and also discohexasters, with five or 

 more medium-sized, tliiu, somewhat externally convex terminals on each of the strongly 

 develojied medium-sized principals. The dermal and gastral scopulse exhibit a stalk 

 with club-shaped swollen ends, while on the other end, turned towards the free bounding 

 surface, there are four prongs with pear-shaped or spherical, l^arb-beset, terminal knobs. 

 Many of the dermal scopulse exhibit no thickening below the origin of their four gently 

 outward-bent knobbed prongs. Moluccas ; Japan, 80 to 200 fathoms. 



Genus 3. Lefroyella, Wyville Thomson. 



With the single species Lefroyella decora, W5rvrille Thomson. 



In the compact skeletal framework of the (1 cm. thick) wall of the syringe-shaped body, 

 there are radially disposed longitudinal plates 2 to 4 mm. in Ijreadth, which project inwards, 

 enclosing longitudinal furrows between them, while the external surface exhibits in the 

 firm cortical layer numerous spirally or circularly disposed round apertures, 3 to 4 mm. 

 in width, with projecting annular fringe. The beams forming the usually distinctly 

 square meshes of the dictyonal framework, are in the neighbourhood of the free 

 bounding surfaces of the tubes slightly spinose, but are otherwise smooth, only here and 

 there exhibiting somewhat thickened nodes of intersection. Bermudas, 1075 fathoms. 



