808 IIECOUP OF CUUKENT KKSEAROIIES RELATING TO 



vaso-poritononl system which Joes uot soom to have been liithoito 

 noticed. Botwooii an apical civcal sac auil t.ho ivsophagus ho saw i)u 

 either side au outgrowth, which was partly soparatocl by a constriction 

 from tho rest of the entorou. lu other preparatitnis ho saw these 

 processes separated from tho enteron, with tlio stone-caual inunedi- 

 ntely between them. Tho dmible sac thus formed became, later on, 

 very uuecpially developed on the two sides. This observatit)n is in- 

 teresting as allying the Asterida on tho one hand with tho Echinoidea 

 and Ilolothuroida, and on tho other with tho Crinoida. In referenco 

 to this hist group the author takes the opportunity of stating that ho 

 WHS wri>ng in following Johannes Miiller in suj)posing that tho tirst 

 oritico which appears between tho tirst and second ciliated band is 

 completely obliterated, and ho has now been convinced by tho 

 demonstrations of Metschuikoft' that tho tirst baud docs uot bccomo 

 complete until the orifice comes to lie within its area. 



Echinoderms of the Norwegian North Sea Expedition.*— Messrs. 

 Danielssen and Koren continue their account of the llolothurians 

 belonging to Dr. Theel's group, tho Elpidida>, by very fully describing 

 a form assigned to a new genus (tho third now launvn), and to bo 

 called Kol'ja hiialiua. Their specimens do not exceed 50 nun. in length. 

 It is very distinctly bilateral, tho back being strongly convex ; its 

 anterior edge, above tho tentacles, forms a kind of collar, with six 

 conical-pointed papilliv*. Tho mouth looks in the same direction as 

 tho ventral side of the body. Of tho parts of tho skin, certain globular 

 nucleated glands with thick walls lying between tho cuticle and 

 coriiim are to bo sjiecially noticed ; they probably aro mucous in 

 character. Of tho three forms of spicula, one which is narrow, sinuous, 

 and doubly pointed, but smaller than in Irpa, is found veutrally ; the 

 largo forms aro also curved, and more or less spinous; tho former 

 measure -Oi-i by -002 mm. ; the latter, -357 by -008 mm. ; the third 

 kind, belonging to the oral disk, is either linear, angulated, and spined, 

 or rosette-shaped, or reticular. Of the internal skeleton tho calca- 

 reous rings are rather rudimentary : the five pieces which compose 

 them are very thin, and of almost uniform thickness throughout. Tho 

 oral disk carries ten tentacles ; the anus is dorsal ; the sexes aro 

 separate ; no anal appendages exist. Found off uotth of Norway, at 

 7r59'N. lat., 1200 fathoms. 



A second new generic typo is described as -cloajj/Ao/roc^HS mtrahilis. 

 It is cylindrical, apodal, posteriorly rounded off'; tho sexes aro 

 distinct ; no anal res])iratory appendages ; skin provided with two 

 kinds of calcareous spicules, the one with alato rays and with long 

 inwardly directed teeth on the circumference, the other more than twice 

 as large, and with long tooth projecting outwards from the perijihery ; 

 there are twelve uon-retractilo tentacles ; the locality is 73^ 47' N. hit., 

 11"-' 21' E. long. ; the depth, 7G7 fathoms. 



Atd-tiwdcrma is a third new genus, represented by two species, 

 .■I. Jffn'i/)!!ii and otjiiie, found at depths less than 500 fathoms ; the 

 chief characters show the body to bo cylindrical, the anterior end 



* • Nyt Mag. Nuturvid.,' x.w. (1870) p. 83, 3 (t>) I'latcs. 



