Echinodermata (1921) Echinodermata echinodermata00grie Year: 1921 ATLANT. DEEP-SEA EXPED. 190 VOL. III.) 7 while 1 found only 8 in the 3 specimens whose tentacles were intact. This difference cannot be of great signi- ficance, however, for, judging from the material at hand, the tentacles are apparently easily lost, but as easily restored. It is therefore probable that my specimens also originally had 10 tentacles. Peniagone wyvillii is new to the Atlantic region, as it was previously collected only by the 'Challenger' off Christmas Island (stat. 271, 0° 33' S., 151° 34' W., 4438 m., temp. 1°
Echinodermata (1921) Echinodermata echinodermata00grie Year: 1921 ATLANT. DEEP-SEA EXPED. 190 VOL. III.) 7 while 1 found only 8 in the 3 specimens whose tentacles were intact. This difference cannot be of great signi- ficance, however, for, judging from the material at hand, the tentacles are apparently easily lost, but as easily restored. It is therefore probable that my specimens also originally had 10 tentacles. Peniagone wyvillii is new to the Atlantic region, as it was previously collected only by the 'Challenger' off Christmas Island (stat. 271, 0° 33' S., 151° 34' W., 4438 m., temp. 1° Cel.). 3'/5 Peniagone ferruginea n. sp. (PI. 1, figs. 4—6.). Stat. 48, 28 54' N., 24' 14' W., 2800 to 3000 m. One specimen which measured: Total length to the point of the dorsal processes 34 mm. Basal length to mouth 25 Largest breadth of body 14 Height of body 6 Length of largest dorsal processes 10 Breadth of dorsal processes 10 Fig. 3. Calcareous deposits from Peniagone ferruginea n. sp. a—c from abactinal surface, d, e from actinal surface, /—// from the tentacles, /' from the tube-feet. The body is oval and about twice as long and one half as high as it is broad. The somewhat elongated mouth is situated on the anterior ventral surface. The anal opening is sub-dorsal, about mm. above the posterior extremity of the body. There are ten tentacles with a disc diameter of 3 mm. and provided with retractile processes. 5 ambulacral papillae are situated on either side of the edge of the posterior half of the body. The largest of these are mm. long and mm. broad. The hindmost papilla is situated at 2 mm. from the anus. The space between the papillae is to 3 mm. respectively. Besides these large ambulacral papillae there are three very small papillae directly below the anus. On the dorsal surface, at the base of the dorsal processes there are two small papillae on either side, mm. in length and mm. in diameter. The body-wall is very thin and, tog
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