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



considerably after the curvature, bears a more or less sharply defined terminal knob, with 

 a smooth apex, but with sides bearing several rows of fine recurved barbs. 



4. Eurete carteri, n. SIX {VI LXXVIII. figs. 7-12). 



Two specimens of Eurete — one of which was trawled by the Challenger Expedition in 

 the vicinity of Little Ki Island (Station 192, lat. 5° 49' 15" S., long. 132° 14' 15" E.), 

 at a depth of 129 fathoms and upon blue mud ground, while the other was dredged by 

 Dr. Doderlein in Sagami Bay, Japan, at a depth of 150 fathoms — are, on account of the 

 agreement of their structure, united into a single species which is very closely allied to 

 Eurete far reopsis, Carter, from the Moluccas. I name these Eurete carteri in honour of 

 the famous Nestor of spongiologists — Mr. Carter. 



The Japanese specimen exhibits a narrow-meshed tubular framework which was fixed 

 to a piece of rock by means of a few compact pedicels. The constituent tubes are from 

 5 to 7 mm. in breadth, and open out by means of short projecting terminal branches. 

 In the wall of several of the tubes there are circular holes measuring from 3 to 4 mm. in 

 width — but whether these are to be ascribed to accidental injuries, or are to be regarded 

 as normal structural features, appears to me to be doubtful. I would lay little weight on 

 the fact, were it not that similar circular perforations of the wall of the tube are also 

 found in the other specimen, which is a fragment of a network of wider tubes. 



The dictyonal network of beams exhibits but little regularity. The meshes are 

 occasionally perfectly square, but are as a rule triangular. The beams are never quite 

 smooth but are more or less richly beset with small pointed tubercles. The intersections 

 are usually somewhat thickened, though here and there they appear but slightly 

 diilerentiated. They are always thickly covered with small tubercles. The pegs which 

 project on the dermal and gastral surfaces are tolerably thin, either conical or provided 

 with a knob-like thickening on the extremity, and are always rough and tuberculated. 



The hypodermalia and hjqsogastralia are rough pentacts with slightly bent transverse 

 rays, while each is provided with a straight radial ray which varies considerably in 

 length. The extremities of the transverse rays are as a rule somewhat swollen, but 

 they are sometimes simply rounded. The radial ray is in most cases simply rounded at 

 the extremity, though occasionally provided with a slight swelling. 



The scopulae of the outer skin resemble those of the gastral surface. Both possess 

 smooth or cjuite insignificantly rough stalks which terminate in the parenchyma by simple 

 rounded extremities or become slightly attenuated ; on the other side, however, from four 

 to six terminal prongs spring from a small conical thickening, and these are provided on 

 the outer extremities with a knob-like rough swelling. The thin, usually smooth, but 

 here and there also somewhat rough stalk of these terminal prongs is always straight or 

 shghtly bent (PI. LXXVIII. figs. 9, 10), but it is never sharply dislocated like the prong 



