1876.] 



Biology of the 'Valo.ous' Cruise, 1875. 



211 



to be the same as the Tertiary fossil figured by Schlicht from Pietzpuhl* 

 (pi. vi. figs. 29-32), and which has been named by Eeuss Noclosaria 

 jScMichtii ; this sand -incorporating form seems common in the depths of 

 the Xorth Atlantic, as I have observed it not only in many of the ' Yalo- 

 rous' dredgings, but also in several of those of the 'Porcupine,' 1869. 

 Orbitolites tenuissimus, Carpenter t, Pullenia quinqueloha, Eeuss, and 

 Lituola nautiloidea, Lamk., also occurred here ; the Orbitolites seems 

 to have a wide distribution in the deep sea, as I have just received 

 specimens from the Marquis da Monterosato which he dredged in 100- 

 200 fathoms off the Sicilian coast. 



Statio7i No. 9. Lat. 59° 10' N., Long. 50° 25' W.; VjbO fathoms. 



This was the last deep-water dredging in Davis Strait. A remarkable 

 new genus of Echinoidea occurred here. In general outline it is almost 

 cylindrical, the length being to the breadth as 5 to 2 ; and the height, 

 which is greatest in the centre, exceeds the breadth. Viewed laterally 

 the cylindrical form is interrupted anteally by two fifths of the length of 

 the animal being sloped away anteriorly above. This sloped-away 

 portion of the Spatangoid is surrounded by a well-marked fasciole, con- 

 taining within it the ambulacral system, which is thus excentric and con- 

 fined to the anterior portion of the animal ; the four lateral ambulacra 

 are remarkably short, consisting of only four or five pairs of pores each : 

 the anterior odd ambulacrum is much larger, and consists of nine pairs 

 of pores, which are of much larger size than those of the lateral ambu- 

 lacra ; it is situated in a broad but very shallow depression. The ten- 

 tacles of the upper portion of the odd ambulacrum are very large and 

 remarkable, of umbrella-like form, supported on flexible columns, which 

 are densely studded and strengthened with fusiform nodulous spicula. 

 The spines are of two forms, battledoor-shaped and of the more usual 

 form. PedicellarisD of two if not of three kinds. Mouth inferior, at one 

 third the length of the animal from the anterior extremity, not situated 

 in a groove (as is the case in Pourtalesia). Anal aperture dorsal, at about 

 one fourth the length of the anunal from the posterior extremity, nearly 

 flush with the surface, neither in a deep depression (as in Pourtalesia) 

 nor in an anal groove. 



In its elongated form this genus shows an approach to Pourtalesia, 

 but in mouth, anal aperture, and the condition of the ambulacral system 

 it is altogether different. The nearest approach I know to the general 

 outline of this genus in found in the Chalk fossil Archiacia sandalina, 

 Ag. ; but in Archiacia the anal aperture is inferior. Indeed the condi- 

 tions of this organ are altogether exceptional ; for in those known genera 



* ' Die Foraminiferen des Septarienthones von Pietzpulil,' 1870, pi. vi. figs. 29-32. 

 Eeuss, Sitzb. d. k. Akad. d. Wissensch. 1. Abth. NoT.-Heft, 1870, ' Die Foraminiferen 

 des Septarienthones von Pietzpulil ' (separate copy, p. 18). 

 t Thomson's ' Depths of the Sea,' woodcut, p. 91. 



Q 2 



