272 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 48. 



inserted about 6 mm. from the anterior end. Polian vesicle and stone- 

 canal single, the latter with a comparatively large madreporite. Re- 

 spiratory trees two, well developed but with very few simple branches. 

 Genital tubes simple and short, each with a single ovum, which meas- 

 ures at most 1.2 mm. in diameter. 



This species is remarkable in that the female has a pair of brood 

 pouches, which lie side by side on the ventral body wall and are lined 

 with a thin, noncalcareous membrane, and open by a common orifice 

 situated in the mid ventral radius, 10 mm. from the anterior end. 

 In these pouches I found ova and young in three different stages of 

 development — mature ova, young, 2 mm. long, and larger ones, 3 mm. 

 or more in length. In one case there were 5 ova and 2 smaller young 

 in the right pouch, and 2 ova, a small young and a larger one, in the 

 other. These larger young seem to be ready for birth, with imbricat- 

 ing scales 300-350/z in diameter, but devoid of marginal process. 

 The presence or absence of pedicels can not be ascertained owing to 

 the excessive development of scales. The smaller young have rather 

 scattered plates, lS0-240,u in diameter, in body wall. Scattered 

 spicules are also found in tentacles and stone-canal. Calcareous ring 

 and coiled gut are already formed, but pedicels could not be made out. 



This species belongs to the group distinguished by Studer as Trachy- 

 thyone, but differs from his muricata in the shape of the scalelike 

 deposits and in the absence of cup-shaped bodies. 



Habitat. — Off Cape Terpyeniya, Sakhalin. 



Type.— Cat. No. 34174, U.S.KM. 



Genus PSEUDOCUCUMIS Ludwig. 

 75. PSEUDOCUCUMIS DACTYLICUS, new species. 



Station 4913. One specimen. 

 Body fusiform, with oral and anal ends prolonged into dorsally 

 curved, slender, tapering processes. Length as measured along mid- 

 ventrum, 45 mm.; along middorsum, 28 mm.; diameter, 8 mm. 

 Color white, due to large scalelike deposits, which stiffen the integu- 

 ment. Tentacles 15, seldom with a few knoblike rudiments of 

 branches, otherwise simple and finger-shaped. Seven of them are 

 long, about 2 mm.; 2 in the middorsal and right ventral interradii, 

 only 1 in each of the other interradii. The remaining 8 are very short; 

 1 in the left dorsal and midventral radii and 2 in each of the other 3 

 radii. Pedicels very minute, arranged in two rows in each ambula- 

 crum, passing through interspaces of scalelike deposits. Around the 

 anus there are 5 papillae. The scalelike deposits are round in contour 

 with rather even margin, and perforated by large numbers of holes; 

 they do not present complex, latticed, laminar structure, but are 

 simply perforated plates; diameter, 0.45-1.20 mm. They lie imbri- 

 cated in such a way that in an ideal cross section the free margin is 



