KEPORT ON THE HOLOTHHRIOTDEA, 
155 
presenting the aspect of lobes. Each of these lobes or protuberances communicates with 
the water- vascular system. The odd ambulacrum with a double row of fully retractile 
pedicels, excepting in its anterior third which is naked. Each of the dorsal 
ambulacra with a simple row of thinly scattered, short, conical processes or papillae. 
Calcareous deposits dissolved. Colour in alcohol, light brownish inclining to violet ; in 
some specimens it is darker, nearly black on the ventral surface, especially along its middle. 
Length of the largest specimen about 300 mm., breadth at the middle of the body 
about 110 mm., height 20 to 25 mm. or less. 
Habitat . — Station 298, November 17, 1875; lat. 34° 7' S., long; 73° 56' W.; depth, 
2225 fathoms; bottom temperature, 35°‘6; blue mud; three specimens. Station 299, 
December 14, 1875; lat. 33° 31' S., long. 74° 43' W.; depth, 2160 fathoms; bottom 
temperature, 35°'2 ; blue mud ; a single very macerated individual. Station 300, 
December 17, 1875; lat. 33° 42' S., long. 78° 18' W.; depth, 1375 fathoms; bottom 
temperature, 35°‘5 ; Globigerina ooze ; six individuals. 
The external aspect of this species bears a great resemblance to that of Euphronides 
depressa, though it is devoid of any larger odd dorsal process. In the largest specimen 
the breadth of the brim at the middle of the body is about 30 mm., and its 
anterior lobes are almost triangular with the base considerably broad. In the other 
specimens the anterior lobes are larger, more rounded, conical, and measuring up to 
8 mm. in length, while the protuberances along the sides of the body are commonly 
less prominent, and mostly present themselves under the shape of small swellings in the 
margin of the brim. The dorsal processes do not seem to attain the same size as 
the lobes of the brim, but are commonly smaller. In one individual, 250 mm. long, 
dredged at Station 298 the number of ambulacral appendages was as follows : — about 
thirty pedicels arranged in a double row on the odd ambulacrum, about seventy-five 
closely placed lobes or j>rotuberances forming a simple row round the margin of the body- 
brim, and fourteen or fifteen processes along each dorsal ambulacrum. In the largest 
specimen the dorsal processes are completely retracted and only visible as very flat 
almost inconspicuous warts with a small pit in the middle. The tentacles seem to be 
twenty, though I am not fully convinced of the accuracy of this number. In the largest 
individual the oral aperture is situated on the ventral surface about 35 mm. behind 
the anterior extremity of the body, and the anus lies on the dorsal surface about 
13 mm. in front of the posterior extremity of the body. In one specimen some small 
warts surround the anal aperture. 
The calcareous ring seems to be absent, or, more probably, dissolved by some 
impurity in the alcohol. The madreporic canal is not fully known. In the largest 
specimen two ventral Polian vesicles are present, one of which has a length of 145 mm., 
while the other only measures 90 mm, A thin bundle of genital tubes, several times 
branched, is situated on each side of the dorsal mesentery, and the common efferent 
